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LG 60PC1D Training Presentation

Advanced dual scan pdp troubleshooting
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Training Presentation
Advanced Dual Scan PDP Troubleshooting
60PC1D
Pravin Mevada
Plasma Display Panel Troubleshooting - 2007
1
Collection By Pravin Mevada

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  Summary of Contents for LG 60PC1D

  • Page 1 Training Presentation Advanced Dual Scan PDP Troubleshooting 60PC1D Pravin Mevada Plasma Display Panel Troubleshooting - 2007 Collection By Pravin Mevada...
  • Page 2: Contact Information

    Customer Service (and Part Sales) (800) 243-0000 Technical Support (and Part Sales) (800) 847-7597 USA Website (GCSC) aic.lgservice.com Customer Service Website us.lgservice.com LG CS Academy lgcsacademy.com Published March 2007 by LG Technical Support and Training Plasma Display Panel Troubleshooting - 2007...
  • Page 3: 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 4 Preliminary Matters (The Fine Print) Troubleshooting CAUTION To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be aware that many household products present a weight hazard. At least two people should be involved in the installation or servicing of such devices.
  • Page 5: Esd Notice

    Preliminary Matters (The Fine Print) Troubleshooting ESD NOTICE Some of the 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 6: Regulatory Information

    Troubleshooting Preliminary Matters (The Fine Print) REGULATORY INFORMATION This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation.
  • Page 7 Preliminary Matters (The Fine Print) Troubleshooting COMPLIANCE The responsible party for this device’s compliance is: LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35824. Plasma Display Panel Troubleshooting - 2007...
  • Page 8 PLASMA Overview Troubleshooting Safety Rules Safety & Handling Regulations 1. Approximately 10 minute pre-run time is required before any adjustments are performed. 2. Do not adjust for higher or lower voltage ( Refer to Voltage Sticker inside the Panel ) than is specified for the product. 3.
  • Page 9: Troubleshooting Steps

    Troubleshooting Troubleshooting Steps Define, Localize, Isolate and Correct • Look at the symptom carefully and determine what circuits could be Define causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor.
  • Page 10 Troubleshooting Overview of Topics to be Discussed 1. Disassembly Instructions, Circuit Board Layout, and Identification 2. Circuit Board Operation, Troubleshooting and Alignment : •Switch mode Power Supply •Y SUS Board •Y Drive Board •Z SUS Board •Control Board •X Drive Boards Plasma Display Panel Troubleshooting - 2007...
  • Page 11 Troubleshooting This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 60PC1D Dual 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 12: Disassembly Procedure

    Troubleshooting Disassembly Procedure 60PC1D To remove the Back Cover remove the 40 screws as shown ( the stand will not need to be removed ) Plasma Display Panel Troubleshooting - 2007...
  • Page 13: Circuit Board Layout

    Circuit Board Layout Troubleshooting 60PC1D First Generation Top X Boards SMPS Board 6709V00016A Z SUS Board Y SUS Y Drive Control Board Board Boards AC/DC PFC / Standby Board 6709V00017A 6709V00018A Supply Main Board EBT32634401 Bottom X Boards Bottom X Boards...
  • Page 14 Troubleshooting Circuit Board Layout 60PC1D Second Generation Note: The Early Version prior to ( March / April 2007 ) had the AC/DC Supply Board in this Position SMPS EAY32961901 Control Board EBT32929501 PFC / Standby EAY32961801 The Power Supply and Control Boards are not interchangeable From one Generation to the other.
  • Page 15 Troubleshooting Circuit Board Layout 60PC1D Input Jacks Plasma Display Panel Troubleshooting - 2007...
  • Page 16 Troubleshooting Disassembly Procedure 60PC1D AC/DC Board Removal Remove Cables P801 ( AC Input Cable ), P8015A ( P-CTL, Rush, 12V ), P8017A ( PFC B+, B- ) and P8016A ( Standby B+, AC Detect ). Remove 6 screws securing the Board.
  • Page 17 Troubleshooting Disassembly Procedure 60PC1D Y SUS Board Removal Remove Cables P1 ( VS, VS, NC, GND, GND, GND, GND, VA, VA ), P2 ( GND, GND, 5VDC, 5VDC ) P3 ( GND, GND, GND, GND, 5VDC, 5VDC, 5VDC, 5VDC ), P4 ( Logic Signals ), P5 ( 5VDC, 5VDC,...
  • Page 18 Troubleshooting Disassembly Procedure 60PC1D Top Middle X Drive Board Removal Care must be taken as there are different size screws with different thread design X Board Removal will require the most disassembling of the unit as the Stand will need to be removed.
  • Page 19 Troubleshooting Disassembly Procedure 60PC1D Plasma Display Panel Troubleshooting - 2007...
  • Page 20 Signal and Voltage Distribution for the 60PC1 Troubleshooting Top X Drive Boards 5V, VA 5V, VA 5v, VA, VS Y Drive Top Logic Signal VA, VS 5v, VA 5V, VA 5v, VA Switch Mode Power Supply Y Drive Signal Y SUS Z SUS Logic Signals Supply...
  • Page 21 60PC1D Interconnect- Test Point Location and Voltage Chart Troubleshooting P106 P108 P107 P105 P104 P103 P102 P101 P208 P207 P206 P205 P204 P203 P202 P201 P302 P303 P304 P305 P306 P307 TP180 P111, P212 P309 P110 TP180 TP180 TP180 TP180...
  • Page 22 TP10 TP15 TP20 TP25 TP11 TP16 TP21 TP26 TP27 TP12 TP17 TP22 TP28 TP23 TP29 TP13 TP18 TP24 TP30 TP14 TP19...
  • Page 23 TP31 TP36 TP41 TP46 TP51 TP56 TP37 TP32 TP42 TP57 TP47 TP52 TP48 TP53 TP58 TP38 TP43 TP33 TP34 TP59 TP39 TP44 TP54 TP49 TP55 TP60 TP45 TP50 TP35 TP40...
  • Page 24 TP61 TP66 TP71 TP78 TP84 TP90 TP72 TP85 TP73 TP62 TP67 TP74 TP79 TP86 TP91 TP80 TP87 TP63 TP68 TP75 TP92 TP81 TP93 TP64 TP76 TP88 TP69 TP82 TP94 TP70 TP83 TP65 TP77 TP89 TP95...
  • Page 25 TP96 TP101 TP106 TP111 TP116 TP123 TP97 TP102 TP107 TP117 TP124 TP112 TP118 TP98 TP103 TP108 TP125 TP113 TP119 TP126 TP120 TP99 TP109 TP104 TP114 TP121 TP127 TP105 TP115 TP122 TP100 TP110 TP128...
  • Page 26 TP129 TP134 TP139 TP145 TP150 TP155 TP140 PIN 3 PIN 8 TP130 TP135 TP141 TP146 TP151 TP156 PIN 4 PIN 9 TP131 TP136 TP142 TP157 TP147 TP152 PIN 10 PIN 5 LVDS Cable pin 1 is GND TP132 TP143 TP137 TP148 TP153 TP158...
  • Page 27 TP160 TP165 TP170 TP175 TP180 PIN 13 PIN 18 PIN 23 PIN 28 TP161 TP166 TP171 TP176 TP181 PIN 14 PIN 19 PIN 24 PIN 29 TP162 TP167 TP172 TP177 PIN 15 PIN 20 PIN 25 PIN 30 TP163 TP173 TP168 TP178 PIN 16...
  • Page 28 Troubleshooting 60PC1D Plasma Display Important Note Model : PDP 60X6#### All Voltage : DC 5V Va : 60V Vs : 193V 250 / -65 / 110 / NA / 170 Max Watt : 570 W ( Full White ) V SET_UP...
  • Page 29: Circuit Operation

    Troubleshooting 60PC1D Second Generation Circuit Operation IC151 is the Power Regulator IC, start up voltage is developed from resistor R167, the Run Line used to maintain operation is Supplied by the circuit of D156, Q152, R151, ZD151, D153 and R160, see page 31, highlighted in yellow. The Power Regulator Transformer T201 supplies the Power FET Q151 Drain.
  • Page 30 On / Off From Micro Plasma Display Panel Troubleshooting - 2007...
  • Page 31 Start Resistor Current Sensing Resistor To Photo Coupler IC PC210 Plasma Display Panel Troubleshooting - 2007...
  • Page 32 SOUND STBY Input R152 R203 C151 C154 R155 R213 Q201 R205 Q202 R167 R202 R210 C205 C201 T201 T201 D152 R153 D151 C207 R204 D201 C204 C203 R201 R211 U151 R159 C202 R217 R154 Q151 R206 Q204 D202 SENCE R215 R212 R161 GATE...
  • Page 33: Smps Board

    Troubleshooting First Generation The 60PC1D Plasma Display contains 3 Power Supply related Circuit Boards and 4 Power Supply Circuits which supply power requirements to the unit. The AC/DC Power Supply Board, the Standby Power Supply and the PFC ( Pulse Frequency Coefficient ) Supply Board and the SMPS ( Switch Mode Power Supply ).
  • Page 34 Troubleshooting Block Diagram 60PC1D Power Supply First Generation SMPS AC/DC SUPPLY 5VDC Source VA Source PFC B+ 110VDC SOURCE Low Voltage Source VS Source Relays 19V, 12V, 6V, 3.4V POD, VSON, 380V and Rush STBY INPUT Source CIRCUIT 380V Source...
  • Page 35 Troubleshooting AC Input AC/DC Power Supply Board P801 P8017A P8015A P8016A Relay Drive 20V and 160V Supply for PFC Supplies Approx. 20V and 160V to the Standby Power Supply and Approx. 110V to the PFC Supply Receives 12V for Relays RL8301 and RL8302 Plasma Display Panel Troubleshooting - 2007...
  • Page 36: Standby Power Supply

    Troubleshooting Standby PFC Power Supply Power Supply PFC Supply Output Power Control P804A P803A P801A VR801 P801 P8015B P8016B Relay Drive PFC Supply PFC Receives 110V from the AC/DC Supply Input Standby Supply receives approx 20V and 160V and and sends 380V and 18V to the outputs 12V, AC Detect, and 5V ST.
  • Page 37 Troubleshooting Switch Mode Power Supply Board VR8401 VR8501 P8011 P8012 5VDC VR8802 P800B P101B 3.4V Pin 7 P803B 380V 3.4V VR8801 Plasma Display Panel Troubleshooting - 2007...
  • Page 38 Troubleshooting 60PC1D Power Supplies AC Power inputs to the AC/DC Supply which is responsible for supplying 160V and 20V to the Standby Power Supply. The Standby Power Supply develops 5V ST and AC DET which is sent to the Main Board to control the power up and down functions. The Standby Supply also develops 12V needed to drive the Relays which switch the AC Power on and off.
  • Page 39 Troubleshooting 60PC1D Power Supply This Troubleshooting Procedure relates to the Power Supply used in the 60PC1D Generation 1 Plasma Display Panel. This explanation will assist the technician in confirming the normal operation of the Power Supply without the need to substitute the circuit boards.
  • Page 40 Troubleshooting 60PC1D Power Supply Generation 1 ( 2 ) 60W Light bulbs P8011 P8012 AC/DC Switch Mode P801A Power Supply Power Supply AC - ON P800B P - CTL P8017A ST – 5V P101B P803B P804B P8015A VS-ON 5V - MT...
  • Page 41 Troubleshooting 60PC1D Power Supply Generation 1 PCTL VSON Wired for Troubleshooting as shown on Page 40 the switches were added for illustrating the power on sequence Plasma Display Panel Troubleshooting - 2007...
  • Page 42 Troubleshooting 60PC1D Power Supply Power On Sequence Remember to always check the resistance for possible shorts if you are missing a voltage • With AC Power applied only, the AC/DC Supply will develop 20V and 160V at P8016A to the Standby Supply.
  • Page 43 Troubleshooting 60PC1D Power Supply Resistance Measurements Boards Disconnected All resistance measurements are approximations. AC/DC Power Supply 480K P801A 269 Rush ctrl (+) 12V (-) P8015A 270 Power ctrl (+) 12V (-) Reversed same readings 8 Meg ST-BY B+ (+) ST-BY B- (-) P8016A Inf.∞...
  • Page 44 Troubleshooting 60PC1D Power Supply Resistance Measurements Boards Disconnected All resistance measurements are approximations. Switch Mode Power Supply 3 MEG* PFC+ (+) GN (-) P803B 286K 18V (+) GN (-) P804B 5VMONI (+) GND (-) 3 MEG* POD (+) GND (-) 4.9 MEG Rush (+) GND (-)
  • Page 45 60PC1D Y SUS Board This Section of the Presentation will cover troubleshooting the Y SUS Board for the 60PC1D Dual Scan Plasma Display. Upon completion of this Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and resistance test points needed for troubleshooting and alignments.
  • Page 46 Troubleshooting 60PC1D Y SUS Board -VY Test Point Use Chassis Ground Ramp Up R137 VSC Test Point V Set UP V Set Down Test Points Scope Test Point V SET UP Floating Ground ( Used for VSC Adjust) Plasma Display Panel Troubleshooting - 2007...
  • Page 47 Troubleshooting 60PC1D Y SUS Board Block Diagram Z SUS Board Y DRIVE Power Supply OUTPUT CIRCUIT Y Drive Power Supply 5VDC 18v IPM Out to the Control Board Y Drive Sus out SUS IPM Sus up Sus Down Switching FET’s...
  • Page 48 Troubleshooting 60PC1D Y-SUS Test Point and Voltage Chart Plasma Display Panel Troubleshooting - 2007...
  • Page 49 60PC1D Y SUS Board Troubleshooting VA, 5V Left Top X Board VS, VA, and 5V to Z Board Scope Waveform Test Point 5VDC 5VDC Output for Floating Ground Control Board Pins 1 thru 4 Logic Signals input from the Control Board...
  • Page 50 Troubleshooting 60PC1D Y SUS Board Panel Adjustments Important Note • The following voltages and waveforms should be adjusted in the order they are presented. • Always adjust the DC levels before the waveform adjustments to most accurately set the Plasma Display Panel.
  • Page 51 Troubleshooting 60PC1D Y SUS Board Panel Adjustments Voltmeter Adjustments Y SUS Board ( Continued • V SET UP Control VR20 250VDC adjustment measured across resistors R51 and R192 which sets the Amplitude of the top portion of the Drive Waveform.
  • Page 52: Panel Adjustments

    Troubleshooting 60PC1D Y SUS Board Panel Adjustments 2 Waveform Adjustments for the Y SUS Board There are two waveform adjustments that will require the use of the oscilloscope to properly adjust. VR1 RAMP UP is the first control, and VR2 V SET DOWN is the second. Scope connection will be made at B41 and Chassis Ground.
  • Page 53 Troubleshooting 60PC1D Panel Waveform Adjustment Z SUS Y SUS Y SUS Y SUS Plasma Display Panel Troubleshooting - 2007...
  • Page 54 Troubleshooting 60PC1D Y SUS Board Panel Waveform Adjustment Vset_DN too low All of the center washes out due to decreased Vset_DN time. NOTE: this can create a no pix condition, but audio is present. Vset_DN too high The center begins to wash out and arc due to decreased Vset_DN time.
  • Page 55 60PC1D Y SUS Board Troubleshooting Panel Waveform Adjustment -VY too low Colors and the image will bloom slightly and the unit will have difficulty with clean frame changes in a quickly altering image. -VY too high The center begins to wash out and ark due to -VY running to long and clipping.
  • Page 56 60PC1D Y SUS Board Troubleshooting Panel Waveform Adjustment VSC too low The image will show very little change but there will Be some distortion in a quickly changing image. VSC too high The image will show very little change but there will Be some distortion in a quickly changing image.
  • Page 57 Troubleshooting 60PC1D Y SUS Board Diagram of Y Sustain Board Power Supply Board - SMPS Z SUS Board Distributes 5v VA VS Receive 5V,Va, Vs Distributes 5v Control Board from SMPS Distributes 5v VA Logic signals needed to generate drive waveform IPM’s generate...
  • Page 58 SUS_UP ER_UP ER_DN SUS_DN SUS_DN There are two IPMs used in 60PC1D on the Y Sustain Board. 1. SUS IPM ( IC7 ) 2. ER IPM ( IC2 ) Role of IPMs on the Y SUS Board 1. Generate Sustain Waveform ( square wave ) – SUS IPM.
  • Page 59 Troubleshooting 60PC1D Y SUS Board How to check IPM (Resistance ‘Diode Check’, board removed from set) Forward Diode Test : 1. GND (+), Sus-out ( - ) 2. Sus-out (+), Vs ( - ) 3. ER_ DN ( - ), GRND (+) 4.
  • Page 60 60 PC1D Y Drive Boards This Section of the Presentation will cover troubleshooting the Y Drive Boards for the 60PC1D Dual Scan Plasma Display. Upon completion of this Section the technician will have a better understanding of the operation of the circuits and will be able to locate voltage and resistance test points needed for troubleshooting.
  • Page 61 Troubleshooting 60PC1D Y Drive Boards Y-Drive Board works as a path supplying Sustain waveform and Reset waveform which are made in Y SUSTAIN B/D and sent to the Panel through SCAN DRIVER IC’s. The Y Drive Boards supply a waveform which selects the horizontal electrodes sequentially.
  • Page 62 Troubleshooting 60PC1D Y Drive Boards To remove the Ribbon cable from the connector first carefully lift the Locking Tab from the back and tilt it forward ( lift from the outside edge as shown in Fig 1). Gently slide the Ribbon Cable free from the connector.
  • Page 63 Troubleshooting 60PC1D Y Drive Boards P3 Floating Ground Q504 Q506 Q507 Q505 Bottom Drive Board Y Drive Signal Floating Ground input 15 Volts at Connector P1 ( Pins 2 and 3 ) must be measured with relation to Floating Ground measuring from the wrong ground will result in an erroneous reading.
  • Page 64 Troubleshooting 60PC1D Y drive Board Block Diagram Bottom Y Drive Board IC25 IC12 IC14 IC11 IC27 IC13 Q507 Q506 Q505 Q504 IC15 Floating Ground Incoming Drive Signal Incoming Logic Signals and 15V Supply Plasma Display Panel Troubleshooting - 2007...
  • Page 65: Operating Voltages

    Troubleshooting 60PC1D Z SUS Board 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 resistance test points needed for troubleshooting and alignment.
  • Page 66 60PC1D Z SUS Board Troubleshooting Input Voltages from the Y SUS Board VS is supplied to IC7 and the SUS_IPM through coil FL5 and to the primary winding of transformer T3 to the Z Bias Circuit. Input voltage measurement is made from connector P12 pins 11 and 12, to chassis ground.
  • Page 67 Troubleshooting 60PC1D Z SUS Board Plasma Display Panel Troubleshooting - 2007...
  • Page 68 Troubleshooting 60PC1D Z SUSTAIN Board Vzb Z BIAS TP IC3 ER-IPM IC7 SUS-IPM Timing, Data, and control signals VS, VA, and 5V in from the Y SUS Board Z BIAS Adjust Control SUS signal TP (B11) Plasma Display Panel Troubleshooting - 2007...
  • Page 69 Troubleshooting 60PC1D Z SUSTAIN Board ZBIAS adjustment: On the Z-Sustain PCB With the DVM connected to Vzb reference to chassis ground adjust the potentiometer till the DVM reads 93 vdc. Plasma Display Panel Troubleshooting - 2007...
  • Page 70 Troubleshooting 60PC1D Waveforms for Z SUSTAIN Board Input Signals to the Z SUS Board at P2 come from the Control Board and pass through the Top Center, and Right X Drive PWBs. Connector P2 feeds the Input Signals to IC1 and IC24 which drive the IPMs. These Signals are used to develop the Z SUS Drive Waveform to drive the PDP Display.
  • Page 71 Troubleshooting 60PC1D Z SUS Board Waveform inputs from the Control Board NOTE: These voltages will vary due to changes in design and variations in the PDP panel. TP141 TP134 TP137 TP144 TP142 TP138 TP145 TP135 TP140 TP136 TP143 Plasma Display Panel Troubleshooting - 2007...
  • Page 72 SUS_DN Chassi GND 5VDC To PDP SUS_UP 5VDC SUS_OUT 18VDC SUS_IPM 60PC1D Z SUS Block Diagram To PDP ER_LOW ER-UP ER-DN ER_IO + C18 18VDC 18V IPM ER_IPM ER_HIGH Logic from the Control PCB. Output Waveform TP IC1, IC24 Q16,...
  • Page 73 Troubleshooting 60PC1D Z SUSTAIN Board Provides the SUSTAIN PULSE and ERASE PULSE for generating SUSTAIN discharge in the panel by receiving LOGIC signals from the CONTROL B/D. This waveform is supplied to the panel through FPC (Flexible Printed Circuit (Z).
  • Page 74 Troubleshooting 60PC1D Z SUSTAIN BOARD Distributes 5v, VA, VS Y SUS Board Distributes Logic Signals Distribute 5v, VA Receive 5v, VA, VS Control Board X Board Right Top and Bottom Generates Z Bias IPM generates erase, 18v IPM Vcc sustain waveforms...
  • Page 75 Troubleshooting Z SUS IPM (Intelligent Power Module) SUS_UP ER_DN SUS_DN ER_UP SUS_DN There are Two IPMs( Intelligent Power Modules) on the Z sustain board One is SUS IPM (IC7) , another is ER IPM (IC3) Role of the IPMs 1. Generate sustain and erase waveform ( square wave ) – SUS IPM. 2.Energy recovery function ( for saving power ) –...
  • Page 76: Cable Connection

    Troubleshooting ▶ Major defect IPM fail cable connection Defect name Description of defect Part Defect display IPM Fail Dark display < Dark display > If the cable was not < No display > P2 Cable connected, connection There is no display Plasma Display Panel Troubleshooting - 2007...
  • Page 77: Resistance Measurements

    Troubleshooting FPC (Flexible Printed Circuit) Removal for Z Board Replacement Pull out Lock as shown in circles Pull FPC Connector as shown in arrow. Pull Lock apart to remove Resistance Measurements ( use any PCB mounting screw for Ground ) •...
  • Page 78 Troubleshooting 60PC1D Control Board This Section of the Presentation will cover the Control Board for the 60PC1D Dual Scan Plasma Display Panel. Upon completion of this section the Technician should have a better understanding of the Circuit and be able to locate Test Points and Voltages necessary for troubleshooting.
  • Page 79 P102 P101 P103 P300 60PC1D Control Board Test Points and Voltage Distribution P200 TP19 IC42 IC46 B2Out 00 – 13 IC45 TP 109 - 122 G2Out 00 – 13 TP 95 - 108 R2Out 00 – 13 TP 81 - 94 TP148- TP177 Addr_STB –...
  • Page 80 Temperature Green = OFF diode Yellow = ON Weight D15 - 8 D16 - 4 D17 - 2 D18 - 1 LG Part Number Label Voltage Regulator Temperature Sensor TEST Pattern AUTOGEN P4 Connector (Micro Control...
  • Page 81 60PC1D Control Board Troubleshooting ▶ Main Defect : MCM , connector, oscilator, LVDS poor connection ▶ Voltage used : 3.3V/3.3V/3.3V/2.4V/1.8V(5 separate operating voltages). Description of Defect part Part Defect display Solution defect Replace Regular vertical Control CONTROL IC lines Board <...
  • Page 82 Troubleshooting The Control Board supplies the Video Signal to the TCP ICs. If there is a bar defect on the screen, it could be a Control Board problem. Diagram of Control Board Control Board to X Board Address Signal Flow This will show Signal Flow Distribution to help determine the failed part depending on where the failure is on the screen.
  • Page 83 Troubleshooting 60PC1D X Drive Boards This section of the Presentation will cover the X Drive Boards. Upon completion the Technician will have a better understanding of the Circuits which make up X Drive and will be able to locate all the voltage test points.
  • Page 84 Troubleshooting 60PC1D X Drive Board Voltages Supplied to the X Boards • VA The Z SUS Board supplies both the Right Top and Bottom X Boards. • VA The Y SUS Board supplies both the Left Top and Bottom, and the Center Top and Bottom X Boards.
  • Page 85 Troubleshooting TCP (Tape Carrier Package) Supplies RGB 6bit signal to the PDP by connecting the PAD Electrode of the PANEL with the X Board. Connector TCP IC Front side Behind side <IC Defect> Plasma Display Panel Troubleshooting - 2007...
  • Page 86 Troubleshooting 60PC1D X Drive Boards Top Center X Drive Board Out to the TCP ICs 5V,VA from Logic Signals for the Top Left X Board Z Sus Board are also RGB Logic Signals Supplied here For the Right Top X Board and...
  • Page 87 Troubleshooting 60PC1D Center Top X Board Connections on Connector P205 B203 37 Thru 39 12,13,14 GND ( 2,3,4) 47,48,49 RGB Logic Signals RGB Logic Signals Grnd Ground Ground 29 Thru 36 VA (42,43,44) VA (7,8,9) 15 Thru 24 40, 41...
  • Page 88 Troubleshooting 60PC1D Center Top X Board OUTPUT to the TCP ICs P208 P207 P206 P205 P204 P203 P202 P201 R250 R246 R242 R254 R251 R247 R243 D203 D202 D204 R255 D201 R252 R248 R244 R256 C209 R253 R249 R245 R257...
  • Page 89 Troubleshooting 60PC1D Main Board This Section of the Presentation will cover the Main Board. Upon completion the Technician will have a better understanding of the Signal Sources that are Processed by this Board and the will be able to confirm its operation.
  • Page 90 Troubleshooting 60PC1D Main Board LVDS Signals P4005 P4003 P4004 Fans R Speaker Tuner L Speaker BCM3550 IC 1001 Digital Audio Computer Input Component Inputs Audio / Video Inputs Antenna / Cable Input S- Video HDMI Inputs RS232 Plasma Display Panel Troubleshooting - 2007...
  • Page 91 Block diagram for CI DTV Troubleshooting Made by S.B Park ANT. Cable Tuner부 Modified by S.K SDRAM SDRAM Date 2006. 2. 9 SIF for NTSC 256Mbit x2 ATSC/NT 256Mbit X-tal SC Tuner 54MHz 64-Bit I/F RS-232C Reset BCM3560 CXA2069(AV S/W) IC1001 USB for upgrade S/W SIF for NTSC...
  • Page 92 Video signal path for Composite/S-video/IF Troubleshooting ANT/ Cable TUNER BCM3550 IF_P from TUNER for DTV IF_P IF_N from TUNER for DTV IF_N CVBS from TUNER TV IN LPF for CVBS Rear AV V, LR CXA2069 M_CVBS SD_CVBS SD_CVBS Rear S IC5003 YC, LR FMS6400...
  • Page 93 Video signal path for Component Inputs Troubleshooting MM1732 IC5001 Comp1_Y 8(3A) MM1731 Comp1_Pb 11(2A) IC5002 6(Out3) Comp_Y 8(3A) Comp1_Pr 16(1A) 5(Out2) Comp_Pb 11(2A) 6(Out3) Y/G to LPF Comp2_Y 9(3B) 3(Out1) Comp_Pr 16(1A) 5(Out2) Pb/B to LPF Comp2_Pb 14(2B) RGB_G 9(3B) 3(Out1) Pr/R to LPF Comp2_Pr 1(1B)
  • Page 94 Video signal path for HDMI Inputs Troubleshooting MST3361 IC704 DDC SDA1 BCM3550 DDC1 DDC SCL1 HDMI 1 IC1001 INPUT TMDS1 RX0+/- Data [0: 23] TMDS1 RX1+/- DATA_OUT HD-DVI TMDS1 TMDS1 RX2+/- INPUT TMDS1 RX3+/- H sync/V sync H,V Sync/DE H,V Sync/Clock /DE/Clock DDC SDA1 /Clock...
  • Page 95: Audio Signal Path Block Diagram

    Audio signal path Block Diagram Troubleshooting ANT/ Cable IF_P from TUNER for DTV BCM3550 IF_P TUNER IF_N from TUNER for DTV IF_N SIF from TUNER CXA2069 Rear AV V, LR Audio R I2S_SCK_IN I2S_SCK_IN Rear S YC, LR OUT1/R I2S_LRCH_IN Side AV I2S_LRCH_IN V,LR...
  • Page 96 “No raster” in details CASE 1. No Picture (Sound Ok) (1) To check LED light on the CTRL B/D (2) To Check input cable from power to signal and CTRL B/D (3) To check connection from power to X_B/D, Y B/D, Z B/D (4) To check connection from CTRL B/D to X B/D, Y B/D, Z B/D (5) To check fuse on Y, Z B/D and IPM (6) Examine Scan IC’s...
  • Page 97 MCM defect on CTRL picture defects description Cause Regular vertical lines Replace CTRL Regular vertical lines Replace CTRL Regular vertical lines on R/G/B Replace CTRL Plasma Display Panel Troubleshooting - 2007...
  • Page 98 MCM defect on CTRL B/D picture defects description Cause Replace CTRL Vertical bar on R/G/B (short) or X Drive PCB Vertical bar on R /G/B Replace CTRL (Open) or X Drive PCB Replace CTRL Color spread on R/G/B Plasma Display Panel Troubleshooting - 2007...
  • Page 99 MCM defect on CTRL B/D picture defects description Cause Abnormal on Top or Bottom Replace CTRL screen (only for Dual Scan model) Replace CTRL Distortion Replace CTRL Vertical Lines Copied Plasma Display Panel Troubleshooting - 2007...
  • Page 100 MCM defect on CTRL B/D picture defects description Cause Replace CTRL A vertical line from top or X Drive PCB (only for 4005A MCM model) Replace CTRL A vertical line from bottom or X Drive PCB (4005A MCM model) Replace CTRL Data Noise Plasma Display Panel Troubleshooting - 2007...
  • Page 101 Related CTRL B/D defects Failure parts Phenomenon picture Cause raining Replace CTRL B/D Connector Full or partly No To check cable connection on the control image and X PCB’s Oscillator No LED light Check power to and on the control PCB if ok replace CTRL B/D Connector Check power to and on the control PCB if...
  • Page 102 Y-SUS B/D & Y-DRV failure picture defects description Cause Check signal and voltage on Y- SUS and Y-DRV if ok replace Y- Y-SUS To replace Y-SUS SUS and/or Y-DRV. & Y- or Y-DRV *Disconnect each Y_DRV PCB one at a time and retest unit. Y-SUS Y-SUS (abnormal display)
  • Page 103 Y-DRV failure defects parts picture defects description Cause Horizontal bar *Disconnect each Y- Y-DRV Replace Y-DRV DRV PCB one at a time and retest unit. Abnormal picture *Disconnect each Y- Y-DRV To replace Y-DRV DRV PCB one at a time and retest unit. Abnormal display (connections connect...
  • Page 104 Z-SUS & others failure picture defects description Cause Dark Picture *Check for supply Z-SUS Replace Z-SUS voltages and Y-SUS, Z- SUS waveforms. To replace X-B/D after X_B/D Partly abnormal display checking cable and connection CTRL Many vertical lines Replace CTRL b/d Plasma Display Panel Troubleshooting - 2007...
  • Page 105 Checking method of Y-DRV ▣ Y-DRV defects 1) Diode value comes 0.4~0.6 Y-DRV OK 2) Less than 0.4, to replace Y-DRV board Pic. 1. ▣ Scan IC defects Pic. 3. Pic 2. <Phenomenon> 1. To fixed up (-) Probe like Pic.2 2.
  • Page 106 Checking method of X_B/D 1. No display of ½ screen 1) To check power connector of the X B/D 2) To check connectors between CTRL B/D and X B/D 3) To replace the X B/D. 4) Be sure the connection of TCP after X B/D replacing ※...
  • Page 107 Checking method of IPM ◎ EX> 42V7 model 1. Forward: test 1. GND(+) , Sus-out(-) test 2. Sus-out(+),Vs(-) In each test, the Diode value are over 0.4V ※ (+) + probe, (-) - probe 2. Reverse : test 1.GND(-) , Sus-out(+) test2.
  • Page 108 Cables roles Ex) 50X3 Cable Role ⑫ ⑧⑨ Supply Va,5V to X B/D ⑩ ⑥ ②③ RGB Video signal ⑭ ④ ⑬ FET driving signal to ⑦ ① ⑤ make the Y waveform ⑤ 5V,15V for IC and FET driving ⑪...
  • Page 109 Cable defects Phenomenon Connection defect by Cable The cable connection Between Y-SUS,Z-SUS,CTRL B/D and X B/D The cable between Y-SUS and Y-DRV The cable between Y-DRV TOP and Y-DRV Bottom. It is for a model of which Y-DRV is separated TOP and Bottom board.
  • Page 110 60” X-PSU. Characteristics from EAY32961901 & EAY32961801 Input requirements Output Characteristics Plasma Display Panel Troubleshooting - 2007...
  • Page 111 60” X-PSU. Adjustment Points and Distribution of Connectors X-PSU Main Part (LGE No: EAY32961801) VR951 - VS ADJ P812 VS SUPPLY (190V-ADJ) VS SUPPLY (190V-ADJ) VA & VS-ADJ have been VS SUPPLY (190V-ADJ) adjusted against PDP N.C. Module Specifications GROUND during final assembly GROUND process in Plasma TVs’...
  • Page 112 60” X-PSU. Adjustment Point and Distribution of Connectors P802 GROUND GROUND 12V SUPPLY 12V SUPPLY GROUND GROUND 6V SUPPLY 6V SUPPLY GROUND GROUND 3.4V SUPPLY 3.4V SUPPLY P803 GROUND 12V SUPPLY GROUND 3.4V SUPPLY GROUND 3.4V-ADJ has 6V SUPPLY been adjusted GROUND and fixed in GROUND...
  • Page 113 X-PSU Block Diagram. Converters and Regulators DISCRETE REG SOUND IC REGULATOR 6.5V AC_DET MULTI- 6.5V only 60” X-PSU OUTPUT ON/OFF CONVERTER INPUT DISCRETE MULTI_ON D125 D130 6.5V DISCRETE REG M5V_ON D126 R750 5V_MNT POWER RELAY(S) IC REGULATOR VCC1 STBY_ON STBY5V 3.4V 3.4V DC/DC...
  • Page 114 X-PSU Block Diagram. Micro-controller Signals From/To Converters and Regulators SOUND Input VS_DET Input Signals Input 3.4V VA_DET Input From/To Main Chassis MULTI_O Input SOUND Input Input STBY_ON 3.3V_ON_IN M5V_O 5V_ON_IN Input VS_OCP RESET Input VS_ON_IN STBY_ON DISCHARGE XOUT 3.4V RL_ON M5V_ON Input PFC_DET...
  • Page 115 60” X-PSU. Main Components by Section GENERIC SECTION LOCATION CLASS DESCRIPTION MANUFACTURER NUMBER F101 0326015.MXP FUSE 15A 250V 5X20MM SLOW-BLO 6.3 X 31.8MM LITTELFUSE B72214-S2381- VA101 VARISTOR 385VRMS 14MM RADIAL EPCOS K101 AC INPUT U121 KIA431A-AT/P KEC LINEAR IC SHUNT REGULATOR VREF: 2.470 ~ 2.520V TO-92 PC501 PS2571L1-1-V-A PHOTO COUPLER...
  • Page 116 60” X-PSU. Main Components by Section LOCATIO GENERIC SECTION CLASS DESCRIPTION MANUFACTURER NUMBER MBRF20100CT OR SCHOTTKY SENSITRON OR 6.5V SUPPLY D233, D234 100V 20A ITO-220AB VF20100SG RECTIFIER VISHAY 6V SUPPLY Q233 AP60T03GH CHIP MOSFET N-CHANNEL 30V 45A TO-252(H) APEC U231 KIA431A-AT/P KEC LINEAR IC SHUNT REGULATOR VREF: 2.470 ~ 2.520V TO-92...
  • Page 117 60” X-PSU. AC Input and Voltage for Multi-Output Converter AC PLUG-I TURN-ON D125-CATHODE D125-CATHODE D126-ANODE D126-ANODE D125-CATHODE D126-ANODE VOLTAGE FOR MULTI- OUTPUT CONVERTER Plasma Display Panel Troubleshooting - 2007...
  • Page 118 60” X-PSU. Multi-Output Converter STAND-BY MOD U601–PIN 5 FROM D125-CATHODE D156-CATHODE Q151–DRAIN U601–PIN 5 (VDD) U601-PIN 6 (GATE) Q151–DRAIN WORKING MO D156-CATHODE U601–PIN 5 (VDD) U601-PIN 6 (GATE) D156-CATHODE U601-PIN 6 Q151–DRAIN Plasma Display Panel Troubleshooting - 2007...
  • Page 119 X-PSU Block Diagram. Micro-controller Signals From/To Converters and Regulators SOUND Input VS_DET Input Signals Input 3.4V VA_DET Input From/To Main Chassis MULTI_O Input SOUND Input Input STBY_ON 3.3V_ON_IN M5V_O 5V_ON_IN Input VS_OCP RESET Input VS_ON_IN STBY_ON DISCHARGE XOUT 3.4V RL_ON M5V_ON Input PFC_DET...
  • Page 120: Power Supply

    Troubleshooting Power Supply Supplements for previous Spring 2007 Meetings Plasma Display Panel Troubleshooting - 2007...
  • Page 121 Troubleshooting Troubleshooting LG Power Supplies Plasma Display Panel Troubleshooting - 2007...
  • Page 122 Power Supply This presentation will discuss Troubleshooting Techniques employed in Flat Screen LG Plasma and LCD Display Power Supplies. Upon Completion of this section the Technician will be able to confirm the condition of the Power Supply with great accuracy and be able to confirm normal operation without circuit board replacement.
  • Page 123: Troubleshooting

    50PC1DR Plasma Display Troubleshooting Power Supply This Troubleshooting Procedure relates to the 50PC1DR Power Supply and should be used to assist in Troubleshooting and determining whether the Power Supply is functioning properly without circuit board substitution. Step 1 With the Power Supply Board removed from the unit and placed in a service position apply AC Power to connector SC101 and check for Standby 5v at connector P800 ( Pin3 ) and the presence of 5v AC Detect at P800 ( Pin1 ).
  • Page 124 Troubleshooting Power Supply Low Voltage Connectors P800 P800 P802 P803 1) AC-D 1) 19V 1) 3.3V 2) RL-ON 2) 19V 2) 3.3V PIN1 3) S-5V 3) GND 3) GND 4) GND 4) GND 4) GND 5) VS-ON 5) 6V 5) 6V 6) 5V-D 6) GND 6) 6V...
  • Page 125 50PC1DR Plasma Display Troubleshooting Power Supply P805 Pin 10 GRND Pin 5 P804 GRND 5VDC P800 1) AC-D 2) RL-ON 3) S-5V 4) GND 5) VS-ON P800 6) 5V-D 7) M5V-ON 8) S-5V (2) 60 Watt Light Bulbs 9) GND 10) NC connected in series 11) 6V...
  • Page 126 47LB1 Troubleshooting Power Supply This Troubleshooting Procedure relates to the Power Supply used in the 47LB1 LCD Display Panel. This explanation will aide the Technician in confirming the normal operation of the Power Supply without needing to substitute the board. Step 1 Remove the Power Supply Board from the unit and place it in the service position Step 2...
  • Page 127 Troubleshooting P203 P206 Power Supply Board 47LB1 T102 T101 P204 P205 SC100 INPUT Sub Micon Board Pin 3 Pin 15 RL- ON 5v Standby 100 OHMS Resistors are ¼ watt 1K OHM 3.3v ON Standby Pin 3 Pin 13 P202 P200 P201 Plasma Display Panel Troubleshooting - 2007...
  • Page 128 Troubleshooting 47LB1 Power Supply Sub Micon (9) 24V ON OFF (1) RLY ON (10) 3.4V DET (2) ACD ON (11) 19V DET (3) RLY ON / OFF (12) 12V DET (4) ACD (13) 6V DET (5) MULTI ON/ OFF (14) 24V DET (15) 5V STB VCC (16) GND Connect a 100 Ohm ¼...
  • Page 129 Troubleshooting 47LB1 POWER SUPPLY P200 P201 P202 (1) 19V (1) 3.4V (1) AC DETECT (2) 19V (2) POWER N/F (2) 3.4V (3) GND (3) ST5V (3) GND (4) GND (4) GND (4) GND (5) INV CTRL (5) 6V (5) 6V (6) ERR_OUT (6) GND (6) 6V...
  • Page 130 Troubleshooting The End Thank You! Collection By Pravin Mevada Plasma Display Panel Troubleshooting - 2007...