LG 50PJ340 Training Manual
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LG 50PJ340 Training Manual

Advanced single scan troubleshooting 50" class hd 720p plasma tv (50" diagonally)
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Training Manual
50PJ350 Plasma Display
50PJ350 Plasma Display
Advanced Single Scan Troubleshooting
50" Class HD 720p Plasma TV
(50" diagonally)
Published July 12
, 2010
th
Updated August 12
, 2010
th

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Summary of Contents for LG 50PJ340

  • Page 1 Training Manual 50PJ350 Plasma Display 50PJ350 Plasma Display Advanced Single Scan Troubleshooting 50" Class HD 720p Plasma TV (50" diagonally) Published July 12 , 2010 Updated August 12 , 2010...

  • Page 2: Troubleshooting

    OUTLINE OUTLINE Overview of Topics to be Discussed Preliminary: Contact Information, Preliminary Matters, Specifications, Plasma Overview, General Troubleshooting Steps, Disassembly Instructions, Voltage and Signal Distribution Troubleshooting: • No Main Power Switch (Vacation Switch). Circuit Board Operation, Troubleshooting and Alignment of : •...
  • Page 3 Overview of Topics to be Discussed Overview of Topics to be Discussed 50PJ350 Plasma Display The first section will cover Contact Information and Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment. Basic Troubleshooting Techniques which can save time and money sometimes can be overlooked.
  • Page 4 PDP Panel Alignment Handbook, Schematics with Bookmarks the Learning Academy site the Learning Academy site Plasma Control Board ROM Update (Jig required) Published July 2010 by LG Technical Support and Training LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813. July 2010...

  • Page 5: Important Safety Notice

    When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury.

  • Page 6: Esd Notice

    ESD Notice ESD Notice (Electrostatic Static Discharge) (Electrostatic Static Discharge) Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the product.
  • Page 7 Safety and Handling, Checking Points Safety and Handling, Checking Points Safety & Handling Regulations Approximately 10 minute pre-run time is required before any adjustments are performed. Refer to the Voltage Sticker inside the Panel when making adjustments on the Power Supply, Y-SUS and Z-SUS Boards. Always adjust to the specified voltage level (+/- ½...

  • Page 8: Basic Troubleshooting Steps

    Basic Troubleshooting Steps Basic Troubleshooting Steps Define, Localize, Isolate and Correct • Define Look at the symptom carefully and determine what circuits could be causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components.
  • Page 9 50PJ350 PRODUCT INFORMATION SECTION 50PJ350 PRODUCT INFORMATION SECTION This section of the manual will discuss the specifications of the 50PJ350 Advanced Single Scan Plasma Display Television. July 2010 50PJ350 Plasma...
  • Page 10 50PJ350 Specifications 50PJ350 Specifications 1080P PLASMA HDTV 50" Class (50" diagonal) 600Hz Sub Field Driving • High Definition Resolution • 3M:1 Dynamic Contrast Ratio • For Full Specifications See the Specification Sheet TruSlim Frame • Picture Wizard II (Easy Picture Calibration) •...
  • Page 11 50PJ350 Logo Familiarization Page 1 of 3 50PJ350 Logo Familiarization Page 1 of 3 600Hz Sub Field Firing: Capture every moment. Tired of streaky action or unclear plays during the game? See sports, fast action and video games like never before. The 600Hz refresh rate virtually eliminates motion blur.
  • Page 12 10.2Gbps) than that of HDMI 1.2, delivering a broader range of colors, and also drastically improves the data-transmission speed. Invisible Speaker Personally tuned by Mr. Mark Levinson for LG TAKE IT TO THE EDGE newly introduces ‘Invisible Speaker’ system, guaranteeing first class audio quality personally tuned by Mr. Mark Levinson, world renowned as an audio authority.
  • Page 13 50PJ350 Logo Familiarization Page 3 of 3 50PJ350 Logo Familiarization Page 3 of 3 AV Mode "One click" Cinema, Sports, Game mode. AV Mode is three preset picture and audio settings. It allows the viewer to quickly switch between common settings. It includes Cinema, Sports, and Game Modes.
  • Page 14 600Hz Sub Field Driving 600Hz Sub Field Driving (600 Hz Sub Field Driving) 600 Hz Sub Field Driving is achieved by using 10 sub-fields per frame process • (vs. Comp. 8 sub-field/frame) No smeared images during fast motion scenes • Original Image 10 Sub Fields Per Frame Sub Field firing occurs using wall charge and polarity differences between Y-SUS and Z-SUS signals.
  • Page 15 50PJ350 Remote Control 50PJ350 Remote Control BOTTOM PORTION p/n AKB72914201 TOP PORTION July 2010 50PJ350 Plasma...
  • Page 16 50PJ350 Rear and Side Input Jacks 50PJ350 Rear and Side Input Jacks AC In USB for Music, Photos and Software Upgrades SIDE INPUTS REAR INPUTS HDMI 3 Composite Video/Audio July 2010 50PJ350 Plasma...
  • Page 17 50PJ350 Dimensions Power: There must be at least 4 inches of Clearance on all sides 2-3/16" 340W (Typical) 55.88mm 0.1W (Stand-By) 46-1/8" 1170.94mm 5-1/4” 133.6mm 15-3/4" 15-3/16” 385.8mm 400mm 30-13/16" 15-3/4" 782.32mm 400mm 28-3/8" Model No. 721.36mm Serial No. Label Remove 4 screws to remove stand for wall mount...

  • Page 18: Disassembly Section

    DISASSEMBLY SECTION DISASSEMBLY SECTION This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 50PJ350 Advanced Single Scan Plasma Display Panel. Upon completion of this section the Technician will have a better understanding of the disassembly procedures, the layout of the printed circuit boards and be able to identify each board.
  • Page 19 Removing the Back Cover Removing the Back Cover To remove the back cover, remove the 32 screws Indicated by the arrows. (The Stand does not need to be removed). PAY CLOSE ATTENTION TO THE TYPE, SIZE AND LENGTH Of the screws when replacing the back cover. Improper type can damage the front.

  • Page 20: Circuit Board Layout

    Circuit Board Layout Identifying the Circuit Boards Circuit Board Layout Identifying the Circuit Boards Panel Voltage and Panel ID Label Z-SUS Power Supply (SMPS) Y-SUS Z-SUB Main Board Control AC In Heat Sink Side Input (part of Left “X” Center “X” Right “X”...
  • Page 21 50PJ350 Connector Identification Diagram 50PJ350 Connector Identification Diagram PANEL p/n: EAJ60716304 (PDP50T10000.ADLGB) Y-DRIVE p/n: EAJ60716316 (PDP50T10000.ASLGB) UPPER Board Z-SUS Board P101 P812 P211 p/n: EBR63040301 SMPS P210 POWER SUPPLY Top row Odd Board P102 Back row Even P110 Y-SUS p/n: EAY60968701 SC101 Board P813...
  • Page 22 Disassembly Procedure for Circuit Board Removal Disassembly Procedure for Circuit Board Removal Note: 1) Remember to be cautious of ESD as some semiconductors are CMOS and prone to static failure. Switch Mode Power Supply Board Removal Disconnect the following connectors: P812, P813 and SC101. Remove the 9 screws holding the SMPS in place.
  • Page 23 Disassembly Procedure for Circuit Board Removal (2) Disassembly Procedure for Circuit Board Removal (2) Z-SUS Board Removal Disconnect the following connectors: P1 and P2, then P101, P102 and P202 by pulling out the locking mechanism and pulling out the FPC to the panel. Remove the 11 screws holding the board in place.
  • Page 24 X Drive Circuit Board Removal Continued X Drive Circuit Board Removal Continued Make sure AC is removed. Lay the Television down carefully on a padded surface. Make sure to use at least two people for this process so as not to flex the panel glass. a) Remove the Back Cover.
  • Page 25 Getting to the X Circuit Boards Getting to the X Circuit Boards With Stand removed Left Right Warning: Never run the TV with the TCP Heat Sink removed Ground Wire Heat Sink Warning Shorting Hazard: Conductive Tape. Do not allow to touch energized circuits. July 2010 50PJ350 Plasma...
  • Page 26 Left and Right X Drive Connector Removal Left and Right X Drive Connector Removal Disconnect connector P122 Va from the See below to Remove the Connections on the X-Boards. Y-SUS to From the Control Board to the X-Boards. Left X Only There may be tape on these connectors.
  • Page 27 Carrier Carrier TCP (Tape Package) Generic Removal Precautions TCP (Tape Package) Generic Removal Precautions Lift up the lock as shown using your fingernail. (The Lock can be easily broken. It needs to be handled carefully.) Separate the TCP from the connector as shown. TCP Film can be easily damaged.
  • Page 28 Left, Center and Right X Drive Removal Left, Center and Right X Drive Removal Remove the 3 screws in Left or Right X-Boards or 5 in the Center X-Board. (9 Total) (Some screws are shared between boards) The Left X Board drives the Right 5/16 of the side of the screen vertical electrodes The Center X Board drives the Center 3/8 of the of the screen vertical electrodes The Right X Board drives the Left 5/16 of the side of the screen vertical electrodes July 2010...
  • Page 29 CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTION CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTION 50PJ350 Plasma Display This Section will cover Circuit Operation, Troubleshooting and Alignment of the Power Supply, Y-SUS Board, Y-Drive Boards, Z-SUS Board, Control Board, Main Board and the X Drive Boards. At the end of this Section the technician should understand the operation of each circuit board and how to adjust the controls.

  • Page 30: Main Board

    50PJ350 Signal and Voltage Distribution Block SMPS OUTPUT VOLTAGES IN STBY SMPS TURN ON SEQUENCE STB +5V Display Panel Y Drive SMPS OUTPUT VOLTAGES IN RUN 5VFG (5V) measured Step 1: RL_ON: 17V, 5V, AC_Det, Error Det, Horizontal Upper from Floating Ground STB5V, +5V, 17V to Main Board Step 2: M_On: M5V, Va, Vs Electrodes...
  • Page 31 (12) Panel Model Name (5) Adjusting Voltage (Set Up / -Vy / Vsc / Ve / Vzb) (13) Max. Watt (Full White) (6) Trade name of LG Electronics (14) Max. Volts (7) Manufactured date (Year & Month) (15) Max. Amps...
  • Page 32 Adjustment Notice Adjustment Notice All adjustments (DC or Waveform) are adjusted in WHITE WASH. Customer’s Menu, Select “Options”, select “ISM” select “WHITE WASH”. It is critical that the DC Voltage adjustments be checked when; 1) SMPS, Y-SUS or Z-SUS board is replaced. 2) Panel is replaced, Check Va/Vs since the SMPS does not come with new panel 3) A Picture issue is encountered 4) As a general rule of thumb when ever the back is removed...
  • Page 33 SWITCH MODE POWER SUPPLY SECTION SWITCH MODE POWER SUPPLY SECTION This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for the Single Scan Plasma. Upon completion of the section the technician will have a better understanding of the operation of the Power Supply Circuit and will be able to locate voltage and test points needed for troubleshooting and alignments.
  • Page 34 Switch Mode Power Supply Overview Switch Mode Power Supply Overview The Switch Mode Power Supply Board Outputs to the : Drives the Display Panel’s Horizontal Electrodes. To Y-SUS, fused then to the X-Boards. (Not used by Z-SUS). Y-SUS Board Primarily responsible for Display Panel Vertical Electrodes. Used to develop Bias Voltages on the Y-SUS then routed to the Control board and then to the Z-SUS Board.
  • Page 35 Power Supply Board Layout (Drawing) Power Supply Board Layout (Drawing) P812 VR901 T901 VS Adj VS and VA VA TP VS TP F801 SMPS 250V p/n: EAY60968701 ZD803 Stand-By: 0.9V T902 VR502 Run: 388V D805 VA Adj D609 ZD401 ZD302 ZD301 D307 D601...
  • Page 36 Power Supply Circuit Layout Power Supply Circuit Layout Primary P812 VS VR901 Source VS Source To Y-SUS Fuse F801 0.9V Stby 388V Run 4Amp/250V VA Source VA VR502 Fuse F302 1.5V Stby 17V Source 388V Run 2.5Amp/250V STBY 5V, RL104 RL103 5V Source Bridge...
  • Page 37 Power Supply Basic Operation Power Supply Basic Operation AC Voltage is supplied to the SMPS Board at Connector SC101 from the AC Input assembly, routed to the Standby 5V supply. The STBY5V (standby) is B+ for the Controller chip on the back of the board (IC701) on the SMPS and output at P813 pins 13 and 14 then sent to the Main board for Microprocessor (IC1) operation (STBY 3.46V RUN 5.14V).
  • Page 38 50PJ350 POWER SUPPLY START UP SEQUENCE 50PJ350 POWER SUPPLY START UP SEQUENCE In Stand-By Primary side is 1.5V F302 In Run (Relay On) Primary side is 388V POWER SUPPLY F801 Stand-By 0.9V AC In (SMPS) Run 388V Stand Regulator By 5V Reg STBY 3.46V 5.14V...
  • Page 39 Power Supply Board Layout (Drawing) Power Supply Board Layout (Drawing) P812 VR901 T901 VS Adj VS and VA VA TP VS TP F801 SMPS p/n: EAY60968701 250V ZD803 Stand-By: 0.9V T902 VR502 Run: 388V VA Adj D805 D609 ZD401 ZD302 ZD301 D307 D601...
  • Page 40 50PJ350 SMPS STATIC TEST UNDER LOAD 50PJ350 SMPS STATIC TEST UNDER LOAD Using two 100 Watt light bulbs, attach one end to Vs and the other end to ground. Apply AC to SC101. If the light bulbs turn on and VS is the correct voltage, allow the SMPS to run for several minutes to be sure it will operate under load. If this test is successful and all other voltages are generated, you can be fairly assured the power supply is OK.
  • Page 41 50PJ350 Power Supply Troubleshooting With P813 disconnected from the Main board (P301) attach two 100 Watt light bulbs, attach one end to Vs and the other end to ground. Apply AC to SC101. If the light bulbs turn on and VS is the correct voltage, allow the SMPS to run for several minutes to be sure it will operate under load.
  • Page 42 SMPS Connector P813 Identification, Voltages and Diode Check SMPS Connector P813 Identification, Voltages and Diode Check P813 Connector “SMPS" to “Main" P301 P813 Label STBY Diode Mode 3.17V 0.46V 5.17V 1.16V Error Det 2.85V 4.1V 3.09V 9-12 13-14 Stby 5V 3.46V 5.14V 2.55V...
  • Page 43 SMPS Connector SC101 and P812 Identification, Voltages and Diode Check SMPS Connector SC101 and P812 Identification, Voltages and Diode Check SC101 AC INPUT Connector Pin Number Standby Diode Mode SC101 L and N 120VAC 120VAC Open P812 "Power Supply“ to Y-SUS “P210” P812 Label Diode Mode...
  • Page 44 SUS BOARD SECTION (Overview) SUS BOARD SECTION (Overview) Y-SUS Board develops the V-Scan drive signal to the Y-Drive boards. This Section of the Presentation will cover alignment and troubleshooting the Y-SUS Board for the Single Scan Plasma. Upon completion of the Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and Diode mode test points needed for troubleshooting and alignments.
  • Page 45 SUS Block Diagram SUS Block Diagram Power Supply Board - SMPS Distributes Vs Z-SUS Board Simplified Block Diagram of Distributes Vs, Va and M5V Y-Sustain Board Distributes 16V / M5V Y-SUS Board Receive M5V, Va, Vs Distributes 16V and M5V Control Board from SMPS Distributes...
  • Page 46 SUS Board Layout SUS Board Layout P211 FS203 (VS) VR402 p/n: EBR63039801 VS to the Z-SUS 4A/250V Set Up Floating Gnd P210 To Y-Drive Upper VS, VA and M5V Floating Gnd Input from the SMPS Scan Signal FS201 (VA) 10A/125V -Vy TP FS202 (M5V) VR401...
  • Page 47 50PJ350 Y-SUS 50PJ350 Y-SUS P211 Connector Y-SUS to Z Drive P2 P211 D401 Diode Layout Drawing Layout Drawing VR402 Label Check Set-Up FS203 4A FS203 VS Example: Diode Check reads Open with Board Disconnected or Connected *206V Open Model : PDP 50T1### Voltage Setting: 5V/ Va:60/ Vs:206 7~11 ER_PASS 98V~102V...
  • Page 48 VSC and VY Adjustments VSC and VY Adjustments CAUTION: Use the actual panel label and not the book for exact voltage settings. This is just for example These are DC level Voltage Adjustments Set should run for 15 minutes, this is the “Heat Run” mode. Set screen to “White Wash”.
  • Page 49 Drive Signal Overview Drive Signal Overview 2MSec Y-Drive Lower Test Point Overall signal observed 2mS/div (Top Buffer) 75 to 90 VRMS 548V p/p White to Black Highlighted signal from waveform above observed 200uS/div 200uSec NOTE: The Waveform Test Points are fragile. If by Highlighted signal from accident the land is torn and the run lifted, make sure...
  • Page 50 Locking on to the Y Drive Waveform Tip Locking on to the Y Drive Waveform Tip Note, this TP (VS_DA) can be used as an External Trigger for scope when locking onto the Y-Drive (Scan) or the Z-Drive signal. This signal can also be used to help lock the scope when observing the LVDS video signals.
  • Page 51 Observing (Capturing) the Y Drive Signal for Set Up Adjustment Observing (Capturing) the Y Drive Signal for Set Up Adjustment Adjustment Area Set must be in “WHITE WASH” All other DC Voltage adjustments should have already been made. Fig 1: As an example of how to lock in to the Y-Drive Waveform.
  • Page 52 Set Up and Set Down Adjustments Set Up and Set Down Adjustments Set must be in “WHITE WASH” All other DC Voltage adjustments should have already been made. Observe the Picture while making these adjustments. Normally, they do not have to be done. ADJUSTMENT LOCATION: Top Left of the board.
  • Page 53 Set Up Adjustment Too High or Low Set Up Adjustment Too High or Low Set Up swing is Minimum 181V Max 266V p/p July 2010 50PJ350 Plasma...
  • Page 54 Set Down Adjustment Too High or Low Set Down Adjustment Too High or Low Set Dn swing is Minimum 116uSec Max 205uSec Normal 180uSec 23V off the Floor Floor Too Low 116uSec July 2010 50PJ350 Plasma...
  • Page 55 SUS Board Troubleshooting VScan SUS Board Troubleshooting VScan TIP: Use the Scan Output Screw Lugs to test for V-Scan signal if the Y-Drive boards are removed Y-SUS Board develops the V-Scan drive signal to the P/N EBR6303801 Y-Drive boards. This Section of the Presentation will cover troubleshooting the Y-SUS Board.
  • Page 56 SUS Board P212 Connector to P205 Lower Y Drive (Logic and FG5V) SUS Board P212 Connector to P205 Lower Y Drive (Logic and FG5V) TIP: Connectors do not come with a new Y-SUS or Y-Drives. TIP: Use Scan Screw Lugs to test for Y-Scan signal if the Y-Drive boards are removed. P205 P212 FGnd...
  • Page 57 SUS Board P212 to Lower Y Drive P205 Logic Signals Explained SUS Board P212 to Lower Y Drive P205 Logic Signals Explained P212 Connector Label Pins 3~12 SUS_DN (FG) FG5V FGnd FG5V SUS_DN (FG) SUS_DN (FG) P205 P212 YB_CLK (4mSec per/div) YB_CLK YB_STB The signal for these pins look very similar...
  • Page 58 SUS P212 Connector Diode Mode Testing SUS P212 Connector Diode Mode Testing Meter in the Diode Mode P212 "Y-SUS" to "Lower "Y-Drive" P205 Red Lead on FG Label Diode Check Diode Check SUS_DN (FG) FGnd FG5V 4.9V 1.82V 0.56V FG5V 4.9V 1.82V 0.56V...
  • Page 59 SUS Floating Ground (FG 15V) and (FG 5V) Checks SUS Floating Ground (FG 15V) and (FG 5V) Checks Voltage Measurements for the Y-SUS Board TIP: These components are on the back of the board. To Test these voltages, remove the board completely, supply Ground and any 5V supply to M5V fuse FS202.
  • Page 60 SUS 16V Generation Checks SUS 16V Generation Checks Location Voltage Measurements for the Y-SUS Board 16V Test Point Used in the Y-SUS for Waveform Creation and Leaves the Y-SUS board on P101 pins 1~3 to the Control Board. Checked at Cathode Side D515. Standby: 0V Run: 16V Diode Check: 1.32V...
  • Page 61 P101 Y SUS to Control Board Fuse Information P101 Y SUS to Control Board Fuse Information Locations Diode Check Open With Board Disconnected or Connected FS201 (M5V) 10V/125V Diode Check 1.19V With Board Disconnected. 0.97V with board connected. 16V Pins 1 through 3 P101 FS204 M5V Pins 4 through 7...
  • Page 62 SUS P113 and P114 Plug Information SUS P113 and P114 Plug Information Voltage and Diode Mode Measurement P210 Connector "Y-SUS" to "Power Supply" P812 Label Diode Check *195V Open P210 *60V Open 9~10 5.1V 1.19V P203 "Y-SUS" to "X-Drive Left" P122 Label Diode Check P203...
  • Page 63 SUS P211 Plug Information SUS P211 Plug Information Voltage and Diode Mode Measurement P211 P211 Connector "Y-SUS" to "Z-SUS" P2 Label Diode Check *206V Open 7~11 *ER_PASS 98V~102V Open * Note: These voltages will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected.
  • Page 64 SUS P101 to Control P111 Plug Voltage Checks SUS P101 to Control P111 Plug Voltage Checks There are No Stand By Voltages on this Connector P101 Connector "Y-SUS" to P111 "Control" Label Diode Label Diode +15V 1.61V DATA 1.02V +15V 1.61V SET_ON 2.09V...
  • Page 65 DRIVE BOARD SECTION Drive Explained) DRIVE BOARD SECTION Drive Explained) Y-DRIVE UPPER (TOP) Y-DRIVE LOWER (BOTTOM) Y-Drive Boards work as a path supplying the Sustain and Reset waveforms which are made in the Y-Sustain board and sent to the Panel through Scan Driver IC’s. The Y-Drive Boards receive a waveform developed on the Y-SUS board then selects the horizontal electrodes sequentially...
  • Page 66 Drive Board Layout Drive Board Layout Y-DRIVE LOWER Y-DRIVE UPPER (BOTTOM) (TOP) Key Points of interest are; If the lugs for Floating Gnd and Scan are making contact with the Y-SUS board and the connector P205 or the one between Upper and lower P204/P110 are removed, the Y-SUS board will fail.
  • Page 67 Drive Upper Layout Drive Upper Layout p/n: EBR63551601 Y-Drive signal (VSC), FG5V Volts PANEL Y-SUS from the Y-SUS board and Logic SIDE SIDE Signals from the Control board through the Y-SUS are supplied to the Lower Y-Drive Board on Connector P205. Connector P110 does not Floating come with a new...
  • Page 68 Drive Lower Layout Drive Lower Layout p/n: EBR63551701 P204 PANEL Y-SUS SIDE SIDE VScan Connector P205 or P204 does not come with a new Y-SUS or Y-Drive. The VScan Warning: Never run the Standoff delivers the Y-SUS with P205 or P204 VScan signal to the disconnected.
  • Page 69 Drive Diode Check Scan and FG Drive Diode Check Scan and FG This checks the output Buffers. PANEL Y-SUS SIDE SIDE Floating Gnd Any Connector to the Panel Scan Signal Floating Gnd (Buffer Output TP) Scan Signal Diode Mode Reading from Floating Ground Scan Signal TP Open with Red Lead on Scan 0.7844V with Black Lead on Scan...
  • Page 70 Drive Buffer Troubleshooting Drive Buffer Troubleshooting YOU CAN CHECK FOR A SHORTED BUFFER ICs OUTPUT USING THIS PROCEDU YOU CAN CHECK FOR A SHORTED BUFFER ICs OUTPUT USING THIS PROCEDU BACK SIDE FRONT SIDE Using the “Diode Test” on the DVM, check the pins for shorts or abnormal loads.
  • Page 71 Drive Upper P110 Connector Voltage and Diode Check Drive Upper P110 Connector Voltage and Diode Check TIP: This connector does not come with a new Y-Drive. Y-Drive Upper Black Lead Red Lead P110 "Upper Y-Drive" on FG on FG Label Diode Check Diode Check P110...
  • Page 72 Drive Lower P204 Connector Voltage and Diode Check Drive Lower P204 Connector Voltage and Diode Check TIP: This connector does not come with a new Y-Drive. Y-Drive Upper Black Lead Red Lead P204 "Lower Y-Drive" on FG on FG Label Diode Check Diode Check SUS_DN (FG)
  • Page 73 Removing (Panel) Flexible Ribbon Cables from Y Drive Upper or Lower Removing (Panel) Flexible Ribbon Cables from Y Drive Upper or Lower Flexible Ribbon Cables shown are from a different model, but pro cess is the same. Flexible Ribbon Cables shown are from a different model, but pro cess is the same.
  • Page 74 Incorrectly Seated Y Drive Flexible Ribbon Cables Incorrectly Seated Y Drive Flexible Ribbon Cables The Ribbon Cable is clearly improperly seated into the connector. You can tell by observing the line of the connector compared to the FPC, they should be parallel. The Locking Tab will offer a greater resistance to closing in the case.

  • Page 75: Operating Voltages

    SUS SECTION SUS SECTION This Section of the Presentation will cover troubleshooting the Z-SUS Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and diode mode test points needed for troubleshooting and all alignments. Note: The Z-SUS can not be run “Stand-Alone”...

  • Page 76: Control Board

    SUS Block Diagram SUS Block Diagram M5V and VS Y-SUS Board Power Supply Board Control Board Z-SUS board receives VS and M5V SMPS and 17V from the Control board Receives Logic Signals Via 3 FPC Circuits generate erase, Flexible Generates Z Bias 100V Printed sustain waveforms Circuits...
  • Page 77 SUS Board Component Identification SUS Board Component Identification P/N EBR63040301 6.3A/250V P101 VS from Y-SUS. Error Com to No IPMs the Y-SUS Z-SUS Z-SUS Waveform Output Test Point FETs No IPMs No IPMs Z-SUS Z-Bias TPs Waveform from Development Control FETs Z-Bias VR201...
  • Page 78 50PJ350 Z-SUS Layout Drawing 50PJ350 Z-SUS Layout Drawing D309 4A / 250V D312 Z-SUS BOARD p/n: EBR63040301 Z-Bias Waveform VR201 July 2010 50PJ350 Plasma...
  • Page 79 SUS Waveform SUS Waveform The Z-SUS (in combination with the Y-SUS) generates a SUSTAIN Signal and an ERASE PULSE for generating SUSTAIN and DISCHARGE in the Panel. This waveform is supplied to the panel through two FPC (Flexible Printed Circuit) connections P101 and P102 and to the Z-SUB P3 to P7 and then to one FPC (Flexible Printed Circuit) connections P202.
  • Page 80 VZB (Z Bias) VR201 Adjustment VZB (Z Bias) VR201 Adjustment Read the Voltage Label on the back top center of the panel when adjusting VR201. VZB (Z Bias) Bottom Left of Z-SUS Board VZB (Z-Bias) TP VZB (Z Bias) VR201 Set should run for 15 minutes, this is the “Heat Run”...
  • Page 81 Connector P2 to Y SUS P211 Voltages and Diode Checks Connector P2 to Y SUS P211 Voltages and Diode Checks Voltage and Diode Mode Measurements P2 Location: Top Left There are no Stand-By voltages on this connector Pin 1 P2 "Z-SUS" to "Y-SUS" P211 Label Diode Check *206V...
  • Page 82 Connector P1 to Control P102 Voltages and Diode Checks Connector P1 to Control P102 Voltages and Diode Checks Voltage and Diode Mode Measurements P1 Location: Bottom Left hand side P1 "Z-SUS Board" to "Control" P101 Label Diode Check (+15V) Open (+5V) 4.9V 1.52V...
  • Page 83 CONTROL BOARD SECTION CONTROL BOARD SECTION This Section of the Presentation will cover troubleshooting the Control Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and diode mode test points needed for troubleshooting. •...
  • Page 84 Control Board Pictorial Control Board Pictorial p/n: EBR63549501 n/c (For ROM Updates) P102 P121 P111 IC211 IC231 P101 Pattern Generator For Panel Test IC801 D201 Should be blinking P161 P162 July 2010 50PJ350 Plasma...
  • Page 85 Control Board Component Identification and Checks Control Board Component Identification and Checks P101 "Control" to "Z-SUS Board" P1 CONTROL BOARD Label Diode With the unit on, if D201 is not on, check 5V supply p/n: EBR63549501 (+15V) Open from FS202 on the Y-SUS. (+15V) Open Pins 4~7 of P111.
  • Page 86 Control Board Temperature Sensor Location (Chocolate) Control Board Temperature Sensor Location (Chocolate) BACK SIDE OF Be sure the Chocolate THE BOARD (Heat Transfer Material) remains Chocolate in place if the board is removed. (Heat Transfer Material) Pin 1 IC121 04) 3.3V 03) Gnd 05) Gnd 02) Gnd...
  • Page 87 Locking on to the Y Drive or Z Drive Waveform Tip Locking on to the Y Drive or Z Drive Waveform Tip Note, this TP (VS_DA) can be used as an External Trigger for scope when locking onto the Y-Drive (Scan) or the Z-Drive signal. This signal can also be used to help lock the scope when observing the LVDS video signals.
  • Page 88 Checking the Crystal X101 “ Clock ” on the Control Board Checking the Crystal X101 “ Clock ” on the Control Board Check the output of the Oscillator (Crystal) X101. Osc. Check: 25Mhz Left Leg The frequency of the sine wave is 25 MHZ. Missing this clock signal will halt operation of the panel drive signals.
  • Page 89 Control Board Signal (Simplified Block Diagram) Control Board Signal (Simplified Block Diagram) The Control Board supplies Video Signals to the TCP (Tape Carrier Package) ICs. If there is a bar defect on the screen, it could be a Control Board problem. Control Board to X Board Basic Diagram of Control Board Address Signal Flow...
  • Page 90 Control Board Connector P111 to Y SUS P101 Voltages and Diode Mode Checks Control Board Connector P111 to Y SUS P101 Voltages and Diode Mode Checks These pins are very close together. Use Caution when taking Voltage measurements. Pins 1 through 3 Receive 16V from the Y-SUS.
  • Page 91 Control P111 to Y SUS P101 Plug Information Control P111 to Y SUS P101 Plug Information Note: There are no voltages in Stand-By mode P111 "Control" Odd Pins to P101 "Y-SUS" P111 "Control" Even Pins to P101 "Y-SUS" Label Diode Check Label Diode Check +15V...
  • Page 92 Control Board LVDS P121 Signals Control Board LVDS P121 Signals LVDS Cable P121 on Control board shown. Press two outside tabs inward to release. Video Signals from the Main Board to the Control Board are referred to as Low Voltage Differential Signals or LVDS. The video is delivered in 12 bit LVDS format.
  • Page 93 Control Board LVDS P121 Connector Voltages and Diode Check Control Board LVDS P121 Connector Voltages and Diode Check P121 Connector "Control Board” to “Main “P703” P121 LVDS "Control" to P703 "Main" P121 LVDS "Control" to P703 "Main" Diode Diode Label Label Check Check...
  • Page 94 Control Board P101 Connector Pin ID and Voltages Control Board P101 Connector Pin ID and Voltages Voltage and Diode Mode Measurements for the Control Board. Note: There are no voltages in Stand-By mode. P101 Label P101 Label P101 Connector "Control" to "Z-SUS Board" P1 Label Diode Check (+15V)
  • Page 95 P161 Connector "Control Board ” “ Center X Board ” P231 P161 Connector "Control Board ” “ Center X Board ” P231 P161 Connector to the Center X-Board P231 (Pins not shown are Gnd) Diode Mode Diode Mode 1.27V 0.97V 1.0V 0.97V 1.0V...
  • Page 96 P162 Connector "Control Board ” “ Center X Board ” P232 P162 Connector "Control Board ” “ Center X Board ” P232 White hash marks White hash marks count as 5 count as 5 56~60 56~60 3.3V 3.3V P162 Connector to the Center X-Board P232 (Pins not shown are n/c or Gnd) Diode Diode...
  • Page 97 X BOARD (LEFT, RIGHT and CENTER) SECTION X BOARD (LEFT, RIGHT and CENTER) SECTION The following section gives detailed information about the X boards. These boards deliver the Color information signal developed on the Control board to the TCPs, (Taped Carrier Packages). The TCPs are attached to the vertical FPCs, (Flexible Printed Circuits) which are attached directly to the panel.
  • Page 98 X Board Additional Information X Board Additional Information There are three X boards, the Left, Center and the Right (As viewed from the rear of the set). The three X boards have very little circuitry. They are basically signal and voltage routing boards. •...
  • Page 99 X Board TCP Heat Sink Warning X Board TCP Heat Sink Warning NEVER run the television with this heat sink removed. NEVER run the television with this heat sink removed. Damage to the TCPs will occur and cause a defective panel. Damage to the TCPs will occur and cause a defective panel.
  • Page 100 X Board Layout Primary Circuit Diode Check X Board Layout Primary Circuit Diode Check The three X-Boards have similar circuit layouts for the connections going to the TCPs, as shown below. 3.3V Pins 32~33 Pins 4~7 Pins 44~47 On Gnd On Gnd On the below: On the below:...
  • Page 101 TCP (Tape Carrier Package) TCP (Tape Carrier Package) This shows the layout of the bottom ribbon cables connecting to the Panel’s Vertical electrodes, (Address Bus). Note that each ribbon cable has a solid state device called a TCP attached. X Drive Board Y-SUS Board Logic Control Board...
  • Page 102 TCP Testing TCP Testing 50PJ350 X Board TCP Connector Distribution Any X Board to Any TCP P101~P105 or P201~P206 or P301~P305 3.3V Origination Leaves Center X P212 pins 47~50 From Control board IC231 center leg. Va: P122 5~7 from Y-SUS To Left X : P121 pins 1~4 Arrives on X board Cent P232 Pins 1~5 Va: Routes to:...
  • Page 103 TCP 3.3V B+ Check TCP 3.3V B+ Check Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. For Connectors P162 on the Checking IC231 for 3.3V, use center pin or Case of component. Control board, see Control board section.
  • Page 104 TCP Visual Observation. Damaged TCP TCP Visual Observation. Damaged TCP Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. After a very short time, these ICs will begin to self destruct due to overheating. This damaged TCP can, (at the location of the TCP).
  • Page 105 Left X Drive P122 Connector from Y SUS P203 Information Left X Drive P122 Connector from Y SUS P203 Information Voltage and Diode Mode Measurement (No Stand-By Voltages) P122 "X Drive Left" to "Y-SUS" P203 With Heat Sink Label Diode Check *60V Open *60V...
  • Page 106 P121, P212, P211 and P331 X Board Connector (VA Diode Check) P121, P212, P211 and P331 X Board Connector (VA Diode Check) Va 1~5 Va 48~50 Va 1~5 Va 48~50 3.3V 11~12 3.3V 41~42 3.3V 11~12 3.3V 41~42 P121 Left X P212 Center X P211 Center X P331 Right X...

  • Page 107: Main Board Section

    MAIN BOARD SECTION MAIN BOARD SECTION The following section gives detailed information about the Main board. This board contains the Microprocessor, Audio section, video section and all input, outputs. It also receives all input signals and processes them to be delivered to the Control board via the LVDS cable. The main tuner (Silicon Tuner using discreet components) which provides VSB, 8VSB and QAM is located on the main board.
  • Page 108 Main Board Layout and Identification Main Board Layout and Identification P704 P704 P703 P703 P301 P301 to Ft IR to Ft IR LVDS LVDS SMPS SMPS P801 P801 Audio Audio Microprocessor Video Processor Optical Optical Audio Audio Audio Audio Remote Remote RS232 RS232...
  • Page 109 50PJ350 Main Front Layout Drawing 50PJ350 Main Front Layout Drawing To SMPS P301 P703 IC308 P704 IC202 IC201 To Ft IR L313 Mstar Micro/ 12Mhz IC801 Video L803 IC402 X402 25Mhz P801 L804 MAIN BOARD p/n: EBT60953802 31.875Mhz Q404 To SPK Q402 D505 (All Pins 12.3V)
  • Page 110 50PJ350 Main Board Front Side Component Voltages 50PJ350 Main Board (Front Side) Component Voltages IC202 7V (to IC405) Q401 Tuner CVBS Q502 HDMI CEC D501 B+ Routing Pin Regulator Pin Buffer (Analog) Pin Buffer Pin to IC502 [1] Gnd [B] 1.19V [1 B] Gnd [A1] 0V [2] Gnd...
  • Page 111 50PJ350 Main Back Layout Drawing 50PJ350 Main Back Layout Drawing IC301 IC302 Q301 IC501 Q302 IC701 IC203 IC303 IC304 Q504 Q303 Q304 IC703 IC504 D502 MAIN BOARD p/n: EBT60953802 IC306 Q501 IC502 Q702 Q503 IC503 IC307 IC602 July 2010 50PJ350 Plasma...
  • Page 112 50PJ350 Main Board Back Side Component Voltages IC203 Winbond Serial IC303 3.3V_MST IC501 HDCP Data IC701 USB 5V Q301 Driver for 5V_MST Q702 RS232 Pin Flash Pin Regulator Pin EEPROM Pin Limiter Pin Switch Q302 Pin Tx Buffer [1] 0V [1] Gnd [1] Gnd [1] 4.97V (In)
  • Page 113 Main Board Tuner Explained Main Board Tuner Explained The Tuner in this set is discreet components (Silicon Tuner) and no longer a self contained unit (can). Check for Tuner B+: 3.3V on IC306 and 1.8V on IC307 Back Side bottom left hand side Front bottom right hand side July 2010 50PJ350...
  • Page 114 Main Board Crystal X1, X402 and X401 Check Main Board Crystal X1, X402 and X401 Check X1 12Mhz 1.58V 1.49V Left Side 2.6V p/p Right Side 3.50V p/p X1 Runs all the time (Micro Halt Crystal) X402 25MHZ X402 X402 Runs only 1.48V during “On”...
  • Page 115 Main Board Removing the LVDS Cable or Power Supply Connector Main Board Removing the LVDS Cable or Power Supply Connector (1) Using your fingers and press in gently on the two locking ta (1) Using your fingers and press in gently on the two locking ta Then rock the connector out of the plug.
  • Page 116 Main Board P703 LVDS Video Signal Test Points Main Board P703 LVDS Video Signal Test Points Waveforms Taken from P703 pins 11 and 12, but there are actually 10 pins carrying video. Input Signal SMPT Color Bar. 10mV per/div. Pin 1 front row right side Pin 11 10uSec per/div Pin 12 10uSec per/div Note: There are no wires...
  • Page 117 Main Board Plug P703 “ LVDS ” Voltages Main Board Plug P703 “ LVDS ” Voltages Voltage and Diode Test for the Main Board P703 “Main Board” Connector to P121 "Control Board” Pin 1 front row right side Diode Diode Note: There are no wires Label Label...
  • Page 118 Main Board Plug P704 to Ft IR Main Board Plug P704 to Ft IR Voltage and Diode Mode Measurements for the Main Board P704 Connector "Main Board" to P100 "Front Keys" Diode Label STBY Check 3.3V 3.76V 3.12V 3 & 4 Soft Touch Key_CTL_0 3.3V...
  • Page 119 Main Board Plug P301 to Power Supply Voltages and Diode Check Main Board Plug P301 to Power Supply Voltages and Diode Check front Diode Mode Check with the Board Disconnected. DVM in the Diode mode. P301 Connector "Main" to "SMPS Board" P813 Label STBY Diode...
  • Page 120 Main Board Speaker Plug P801 Voltage and Diode Check Main Board Speaker Plug P801 Voltage and Diode Check Voltage and Diode Mode Measurements for the Main Board Speaker Plug P8010 Connector "Main" to "Speakers" Label Diode Mode 8.51V Open 8.51V Open 8.51V Open...
  • Page 121 FRONT IR, POWER LED and SOFT TOUCH KEY PAD SECTION FRONT IR, POWER LED and SOFT TOUCH KEY PAD SECTION The following section gives detailed information about the Front IR and Soft Touch Key Pad. These boards contains the Infrared Receiver, Intelligent Sensor and Power LEDs section.
  • Page 122 Front Control (IR and Intelligent Sensor) Board and Power LED Bo ard Location Front Control (IR and Intelligent Sensor) Board and Power LED Bo ard Location Lower Left Side (As viewed from rear). Lower Left Side (As viewed from rear). Front IR Board Soft Touch Key Pad Soft Touch...
  • Page 123 Front Control Board Connector P100 Voltage and Pin Identificati Front Control Board Connector P100 Voltage and Pin Identificati P100 Connector "Front Keys" to P704 "Main Board" Label STBY Diode Check 3.3V 3.76V 2.75V For the Soft Touch Key Pad section. Key_CTL_0 3.3V 3.29V...
  • Page 124 Front IR Board Plug P101 to Soft Touch Keys (Voltages and Pin Id entification) Front IR Board Plug P101 to Soft Touch Keys (Voltages and Pin Id entification) Voltage and Diode Mode Measurements for the Main Board P101 CONNECTOR “Ft IR Board" to "Ft Key Pad” STBY Diode Check 0.07...
  • Page 125 SOFT TOUCH KEY PAD SECTION (Board Layout and Identification) SOFT TOUCH KEY PAD SECTION (Board Layout and Identification) The Soft Touch Key Pad is a thin “Static” sensitive pad that is adhered to the front protective shield. The Soft Touch Key Pad requires a static sensitive key press decoder IC to change the key press data into R2 Ladder (Resistive data) which the Microprocessor can understand.
  • Page 126 Soft Touch Key Pad Soft Touch Key Pad The Soft Touch Key Pad is a thin “Static” sensitive pad that is adhered to the inside of the front protective shield. Plastic Frame Lifted up slightly Soft Touch Key Pad P101 Ribbon Cable July 2010 50PJ350...
  • Page 127 P100 (Key 1, Key 2) Resistance Reading with Soft Touch Key pressed. Soft Touch Key Soft Touch Key Pin 3 measured Pin 4 measured Pad Resistance Pad Resistance from Gnd from Gnd and Diode Mode and Diode Mode CH (Up) 0.61K Ohms Volume (+) 3.6K Ohms...
  • Page 128 INVISIBLE SPEAKER SYSTEM SECTION INVISIBLE SPEAKER SYSTEM SECTION Invisible Speaker System Overview (Full Range Speakers) p/n: EAB60962801 The 50PJ350 contains the Invisible Speaker system. The Full Range Speakers point downward, so there are no front viewable speaker grills or air ports. Installed View Remove two screws from the bottom...
  • Page 129 INTERCONNECT DIAGRAM (11 X 17 Foldout) SECTION INTERCONNECT DIAGRAM (11 X 17 Foldout) SECTION This section shows the Interconnect Diagram called the 11X17 foldout that’s available in the Paper and Adobe version of the Training Manual. Use the Adobe version to zoom in for easier reading. When Printing the Interconnect diagram, print from the Adobe version and print onto 11X17 size paper for best results.
  • Page 130 50PJ350 (50T1 Panel) CIRCUIT INTERCONNECT DIAGRAM 50PJ350 (50T1 Panel) CIRCUIT INTERCONNECT DIAGRAM 50VAC rms “White” VR402 224V p/p SMPS Stand-Alone Test – Unplug P813 to Main board. 46VAC rms “Black” Set-up ± 5V Use two (100W) light bulbs in series between Vs and Gnd to place a load on the SMPS. Connect Scope between P813 "SMPS"...
  • Page 131 50PJ350 Main Board (Front Side) Component Voltages IC202 7V (to IC405) Q401 Tuner CVBS Q502 HDMI CEC D501 B+ Routing Pin Regulator Pin Buffer (Analog) Pin Buffer Pin to IC502 [1] Gnd [B] 1.19V [1 B] Gnd [A1] 0V [2] Gnd [E] 1.86V [2 S] 3.18V [A] 4.54V...
  • Page 132 Connector P703 Configuration - indicates signal pins. 15 and 16 Is the Video Clock and Data lines...
  • Page 133 End of Presentation End of Presentation This concludes the Presentation Thank You July 2010 50PJ350 Plasma...

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