LG 42PQ30 Training Manual
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LG 42PQ30 Training Manual

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Training Manual
42PQ30 Plasma Display
42PQ30 Plasma Display
PRELIMINARY
PRELIMINARY
Advanced Single Scan Troubleshooting
720p
720p
NOTICE:
ALL INFORMATION CONTAINED WITHIN
THIS PACKAGE IS BASED ON PRE-SALES
MODEL. INFORMATION SUBJECT TO
CHANGE AT FINAL PRODUCTION
1

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  • Page 1 Training Manual 42PQ30 Plasma Display 42PQ30 Plasma Display PRELIMINARY PRELIMINARY Advanced Single Scan Troubleshooting 720p 720p NOTICE: ALL INFORMATION CONTAINED WITHIN THIS PACKAGE IS BASED ON PRE-SALES MODEL. INFORMATION SUBJECT TO CHANGE AT FINAL PRODUCTION...
  • Page 2 • Y Drive Boards (Receives Y Drive signals from Y-SUS PWB) • Z SUS Output Board (Connects directly with FPC to Panel) • Control Board • X Drive Boards (2) • Main Board • Main Power Switch, deactivates all inputs from IR or Keys Preliminary Information 42PQ30...
  • Page 3 Overview of Topics to be Discussed Overview of Topics to be Discussed 42PQ30 Plasma Display Section 1 This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment.

  • Page 4: 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. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for service, they must be returned to their original positions and properly fastened.

  • Page 5: Regulatory Information

    Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help. Preliminary Information 42PQ30...
  • Page 6 (800) 847-7597 USA Website (GCSC) aic.lgservice.com Customer Service Website us.lgservice.com LG CS Academy lgcsacademy.com LG Web Training lge.webex.com Published March 2009 by LG Technical Support and Training LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813. Preliminary Information 42PQ30...
  • Page 7 1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy. 2. Check the model label. Verify model names and board model matches. 3. Check details of defective condition and history. Example: Y Board Failure, Mal-discharge on screen, etc. Preliminary Information 42PQ30...
  • Page 8 The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer. Preliminary Information 42PQ30...
  • Page 9 42PQ30 Product Information 42PQ30 Product Information This section of the manual will discuss the specifications of the 42PQ30 Advanced Single Scan Plasma Display Panel. Preliminary Information 42PQ30...
  • Page 10 • Fluid Motion • 3x HDMI™ V.1.3 with Deep Color • AV Mode (Cinema, Sports, Game) • Clear Voice • LG SimpLink™ Connectivity • Invisible Speaker System • 100,000 Hours to Half Brightness (Typical) • PC Input Preliminary Information 42PQ30...
  • Page 11 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 12 42PQ30 Specifications Logo Familiarization 42PQ30 Specifications Logo Familiarization AV Mode "One click" - Cinema, Sports, Game mode. TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode which allows you to choose from 3 different modes of Cinema, Sports and Game by a single click of a remote control.
  • Page 13 180Hz 60Hz Moving Picture Response Time Moving Picture Response Time is 16.5 milliseconds is 5.44 milliseconds (120Hz takes MPRT to 8.25ms) Panel Response Time Panel Response Time is less than 1 millisecond is 4 to 8 milliseconds Preliminary Information 42PQ30...
  • Page 14 42PQ30 Remote Control 42PQ30 Remote Control TOP PORTION BOTTOM PORTION Preliminary Information 42PQ30...
  • Page 15 Rear and Side Input Jacks Rear and Side Input Jacks Software Upgrades AC In Preliminary Information 42PQ30...
  • Page 16 42PQ30 Product Dimensions 42PQ30 Product Dimensions There must be at least 4 inches of Clearance on all sides Wattage 3-1/8" Avg: 181W 78.7mm 40-1/2" Stby: 0.13W 1028.7mm 4-1/8" 104mm 15-3/4" 400mm 12-3/16" 310mm 15-3/4" 400mm 28-5/16" 718.8mm 15-3/4" Center 400mm Model No.
  • Page 17 DISASSEMBLY SECTION This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42PQ30 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 18 42PQ30 Removing the Back Cover 42PQ30 Removing the Back Cover To remove the back cover, remove the 26 screws (The Stand does not need to be removed). Indicated by the arrows. PAY CLOSE ATTENTION TO THE TYPE, SIZE AND LENGTH Of the screws when replacing the back cover.
  • Page 19 42PQ30 Circuit Board Layout 42PQ30 Circuit Board Layout Y Drive Panel ID Label Panel Voltage Label Power Supply (SMPS) PWB Z-SUS PWB Y SUS PWB Side Input (part of main) Control PWB Heat Sink Main PWB AC In Right “X”...
  • Page 20 Remove the PWB by lifting slightly and sliding the PWB to the left unseating P204 and P200 from the Y-SUS PWB. Note: PWB stand-offs have a small collar. The board must be lifted slightly to clear these collars. Preliminary Information 42PQ30...
  • Page 21 Remove the 6 screws holding the Heat Sink in place. Rock back and slide down to remove. Disconnect the following connectors: P201 through P206 and P301 through P306 Remove the 3 screws holding each of the X Drive PWBs in place (8 total) Remove the PWBs. Preliminary Information 42PQ30...
  • Page 22 X-DRIVE PWBs REMOVAL: Disconnect all TCP ribbon cables from the defective X-Drive PWB. Remove the 4 screws holding the PWB in place. Remove the PWB. Reassemble in reverse order. Recheck Va / Vs / VScan / -VY / Z-Drive. Preliminary Information 42PQ30...
  • Page 23 Getting to the X Circuit Boards Getting to the X Circuit Boards Warning: Never run the TV with the TCP Heat Sink removed Right Left Heat Sink Warning Shorting Hazard: Conductive Tape. Do not allow to touch energized circuits. Preliminary Information 42PQ30...
  • Page 24 Gently pry the locking mechanism upward and remove the ribbon cable from the connector. Removing TCPs. Carefully lift the TCP ribbon up and off. Gently lift the locking mechanism upward on all TCP connectors P201~206 or P301~306 Cushion (Chocolate) Flexible ribbon cable Preliminary Information 42PQ30...
  • Page 25 TCP Connector Removal Lift up the lock as shown by arrows. (The Lock can be easily broken. It needs to be handled carefully.) Pull TCP apart as shown by arrow. (TCP Film can be easily damaged. Handle with care.) Preliminary Information 42PQ30...
  • Page 26 Remove the 4 screws for either PWB or 7 total for both. (The Center screw secures both PWBs) Left X Board drives the right side of the screen Right X Board drive the left side of the screen Preliminary Information 42PQ30...
  • Page 27 SECTION 2: CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTION CIRCUIT ALIGNMENT SECTION 42PQ30 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.
  • Page 28 42PQ30 SIGNAL and VOLTAGE DISTRIBUTION BLOCK DIAGRAM 42PQ30 SIGNAL and VOLTAGE DISTRIBUTION BLOCK DIAGRAM Display Panel Horizontal Address Reset Y Drive PWB FPCs M5V, Vs, Va SMPS OUTPUT VOLTAGES IN STBY P201 Y-SUS STB +5V (AC Voltage Det) P811 SMPS OUTPUT VOLTAGES IN RUN...
  • Page 29 (4) Adjusting Voltage DC, Va, Vs (12) 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 30 1) When the Y-SUS PWB is replaced 2) When a “Mal-Discharge” problem is encountered All label references are from a specific panel. 3) When an abnormal picture issues is encountered They are not the same for every panel encountered. Preliminary Information 42PQ30...
  • Page 31 Hand side for the correct voltage levels for the VA, VS, -VY, Vscan, and Z Bias as these voltages will vary from Panel to Panel even in the same size category. • Set-Up and Ve are just for Label location identification and are not adjusted in this panel. Preliminary Information 42PQ30...
  • Page 32 Switch Mode Power Supply Part Number SMPS P/N EAY58349601 Check the silk screen label on the top center of the PWB of the Power Supply itself to identify the PWB P/N. We will examine the Operation of this Power Supply. Preliminary Information 42PQ30...
  • Page 33 42PQ30 SMPS PWB LAYOUT (POWER SUPPLY) 42PQ30 SMPS PWB LAYOUT (POWER SUPPLY) P811 Hot Ground: Represents a Shock Hazard P811 P813 T901 Both F801 and F302 VR502 read from Hot Gnd F801 VR901 4A/250V Stby 338V Run 388V 5V Det...
  • Page 34 There are 2 adjustments located on the Power Supply Board VA and VS. The 5V VCC is pre-adjusted and fixed. All adjustments are made with relation to Chassis Ground. Use “Full White Raster” 100 IRE RV901 Adjustments RV951 Preliminary Information 42PQ30...
  • Page 35 338V Stby 388V Run Fuse F801 VS VR901 VA VR502 4Amp/250V 338V Stby 388V Run Fuse F302 STBY 5V IC701 17V, 12V Sub Micon 1Amp/250V Source Main Fuse F101 P813 AC Input 6.3Amp/250V SC 101 To MAIN Preliminary Information 42PQ30...
  • Page 36 VS-ON line high at Pin 20 of P813 on the SMPS Board which when sensed by the Sub Micon IC (IC701) turns on the VA and VS Supplies (VA pins 6 and 7 is brought high before VS pins 1 and 2) and output from P811 to the Y-SUS board. Preliminary Information 42PQ30...
  • Page 37 42PQ30 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB 42PQ30 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB M5V (DC Voltage) Also develops 15V In Stand-By In Run (Relay On) Primary side is Primary side is AC In 370V Vs/Va (DC Voltage)
  • Page 38 Audio would be present. If VS-ON went high and VS and VA where missing the problem could be caused by a failure on the SMPS or a circuit using these voltages. A Resistance check should narrow the possible failures quickly. Preliminary Information 42PQ30...
  • Page 39 (Remember, Vs is routed to the Z-SUS PWB P3 from the Y-SUS P206 pins 1 & 2. This will allow the Y-SUS to function. Also, if you unplug the Y-SUS from the SMPS and jump the 5V VCC line to any 5V location on the Control Board the Control PWB will function. Preliminary Information 42PQ30...
  • Page 40 42PQ30 SMPS (LIGHT BULB) STATIC TEST UNDER LOAD 42PQ30 SMPS (LIGHT BULB) STATIC TEST UNDER LOAD Using two 100 Watt light bulbs, attach on end to Vs and the other end to ground. Apply AC to SC101. If the light bulbs turn on, allow the the SMPS to run for several minutes to be sure it will operate under load.
  • Page 41 (D) 100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12) to VS ON (Pin 20) brings the VA and VS (P811 pins 1 and 2 Vs and Pins 6 and 7 Va) Lines high Preliminary Information 42PQ30...
  • Page 42 Automatically. P811. are generated. But, check using 200W Va TP light bulb test. P811 Pin 6 or 7 Vs TP P811 Pin 1 or 2 Important: Use the Panel Label Not this book for all voltage adjustments. Preliminary Information 42PQ30...
  • Page 43 Label STBY Diode Mode *194V Open *194V Open *60V Open *60V Open 2.99V 2.99V * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 44 5V Det .15V 3.1V VS On 3.2V Open RL On 3.73V Open Open M5 ON 3.24V Open Auto Gnd Stby 5V Open Key On Open Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 45 V Set Down sets the Pitch of the Bottom Ramp of the Drive Waveform To the Control Board then routed to the Z-SUS board Floating Ground FG 5V Used on the Y-Drive boards (Measured from Floating Gnd) Preliminary Information 42PQ30...

  • Page 46: Table Of Contents

    Control PWB Pins 7, 8, 9, 10 and 11 P202 VSC ADJ P202 Logic (Drive) Signals to -VY ADJ VR501 15V TP Va to Left X Board the Y Drive PWBs VR502 J269 Pins 1, 2 and 3 Preliminary Information 42PQ30...

  • Page 47: P207 Pins 1 And 2 Y Scan Signal

    Pins 4 or 5 P207 6. SUS Dn 7. CLK 8. STB 9. OC1 10. DATA 11. n/c P207 Pins 7, 8, 9, 10 and 11 12. SUS_Dn Logic (Drive) Signals to the Y Drive PWBs Bottom Connector P207 Preliminary Information 42PQ30...

  • Page 48: Vsc Tp R520 / J263

    Set should run for 15 minutes, this is the “Heat Run” mode. R520 Set screen to “White Wash” mode or 100 IRE White input. Adjust –Vy to Panel Label voltage (+/- 1V) Adjust VSC to Panel Label voltage (+/- 1V) Lower Left Side of PWB Preliminary Information 42PQ30...
  • Page 49 NOTE: The two test points just below and to the left 100uS will also work for the Y-Drive waveform Test Point. Preliminary Information 42PQ30...
  • Page 50 At 400us per/div. the signal for is now easier to SET-UP 400uS recognize. It is outlined within the Waveform Fig 4: At 40uSec per/division, the adjustment for FIG4 can be made. 40uS SET-UP Area to be adjusted Preliminary Information 42PQ30...

  • Page 51: Set Dn

    At 400us per/div. the signal for is now easier to SET-DN 400uS recognize. It is outlined within the Waveform Fig 4: At 40uSec per/division, the adjustment for SET-DN FIG4 can be made. 40uS Area to be adjusted Preliminary Information 42PQ30...
  • Page 52 SET-DN ADJUST: 2) Adjust VR401 and set the (B) time of the signal to match the waveform above. ADJUSTMENT LOCATION: Just to the bottom right of the right hand heat sink. Preliminary Information 42PQ30...
  • Page 53 Peeking too late and alters the start of the Vset DN phase. Very little alteration to the picture, the wave form indicates a Ramp (Vset UP) too low distorted Vset UP. The peek widens due to the Vset UP peeking too quickly. Preliminary Information 42PQ30...
  • Page 54 PWB and make necessary adjustments. All of the center washes out due to increased Vset_DN time. Vset DN too high The center begins to wash out and arc due to decreased Vset DN too low Vset DN time. Preliminary Information 42PQ30...
  • Page 55 Generates Vsc and -Vy Circuits generate from Vs by DC/DC Converters Y Sustain Waveform Also controls Ramp Up/Down Generates Floating Ground Left X Board 5V by DC/DC Converters FETs amplify Sustain Waveform Y Drive Board Display Panel Receives Scan Waveform Preliminary Information 42PQ30...
  • Page 56 Reverse: Open Reverse: Open 30N45T 30N45T IRGP4086 Forward: 0.6V Forward: 0.6V Forward: 0.39V ~ 0.5V Reverse: Shorted Reverse: Shorted Reverse: Open K3667 K3667 K3667 Forward: 0.4V ~ 0.5V Forward: 0.22V Forward: 0.5V Reverse: Open Reverse: Open Reverse: Open Preliminary Information 42PQ30...
  • Page 57 Label STBY Diode Mode *193V Open *193V Open *60V Open *60V Open 1.1V 1.1V * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 58 P202 CONNECTOR "Y-SUS PWB" to "X-Drive” Left P233 Label STBY Diode Mode *60V Open *60V Open *60V Open * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 59 Diode Mode Er Com * 94.9V Open Er Com *94.9V Open *193V Open *193V * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...

  • Page 60: Fs201(5V)

    Leaves the Control Board on P101 pins 10. Standby: 0V Run: 5V Diode Check: 1.1V FS501 15V to run the Z-SUS Board. Routed through the Control Board. Leaves the Control Board on P101 pins 11 and 12. Standby: 0V Run: 15V Diode Check: 0.78V Preliminary Information 42PQ30...
  • Page 61 0.6V 0.65V 0.17V 0.65V 2.96V 0.65V 2.5V 0.65V 1.4V 0.65V 0.65V 0.65V 0.65V 1.89V 0.65V Open 2.16V 0.65V 0.44V 0.44V 0.44V 0.44V 0.44V Open Open Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 62 P207 Pin Label Voltage 1) VSC 140V 2) VSC 140V 3) Nc 4) 5V VF 5) 5V VF 6) SUS_DN FGnd 7) CLK 0.96V 8) STB 2.3V 9) OC1 2.3V 10) DATA 11) Nc 12) SUS_DN FGnd Preliminary Information 42PQ30...
  • Page 63 1.57V 0.59V 9.) OC1 1.67V 0.63V 10.) Data 1.57V 0.59V 11.) nc 1.67V 0.65V Floating Gnd 12.) SUS Dn Pin 1 Pin 1 on Y-SUS is backwards Floating compared to Meter in the Diode Mode Ground Y-Drive Preliminary Information 42PQ30...
  • Page 64 Y SUSTAIN PWB and sent to the Panel through SCAN DRIVER IC’s. The Y Drive Boards supply a waveform which selects the horizontal electrodes sequentially. * 42PQ30 uses 8 DRIVER ICs on 1 Y Drive Board Y DRIVE WAVEFORM Y DRIVE WAVEFORM TEST POINT To facilitate scope attachment, solder a small wire (Stand Off) at this point.
  • Page 65 P101, P103, P102 and pins 1 and 7 of P104 P101 P103 P102 P104 BOTTOM PANEL SIDE Check 5V supply using FL1 or across C18. Measured from Floating Ground Y Drive Scan (VSC) Signal Input TP Or measure at Pins 1 and 2 of P104 Preliminary Information 42PQ30...
  • Page 66 5) 5V VF up unless set up unless set 6) SUS_DN FGnd plugged into an plugged into an 7) CLK 0.96V isolation isolation 8) STB 2.3V 9) OC1 2.3V transformer. transformer. 10) DATA 11) Nc 12) SUS_DN FGnd Preliminary Information 42PQ30...
  • Page 67 0.5V 2.9V 4.) OC1 0.5V Open 3.) Data 0.62V Open 2.) nc 0.48V Open Floating Gnd 1.) SUS Dn Pin 1 Pin 1 on Y-SUS is backwards Floating compared to Meter in the Diode Mode Ground Y-Drive Preliminary Information 42PQ30...
  • Page 68 To reinstall the Ribbon Cable, carefully slide it back into the slot see ( Fig 3 ), be sure the Tab is seated securely and press the Locking Tab back to the locked position see ( Fig 2 then Fig 1). Preliminary Information 42PQ30...
  • Page 69 Note the cable is crooked. In this case the Tab on the Ribbon cable was improperly seated at the top. This can cause bars, lines, intermittent lines abnormalities in the picture. Remove the ribbon cable and re-seat it correctly. Preliminary Information 42PQ30...
  • Page 70 Indicated by white outline 43 42 128 Output Pins per/buffer • Any of these output lugs can be tested. 6 Ribbon cables (Horizontal Grids) • Look for shorts indicating a defective Buffer IC 768 Total Horizontal Grids controlling Vertical resolution Preliminary Information 42PQ30...
  • Page 71 Locations Locations • DC Voltage and Waveform Test Points • Z BIAS Alignment • Resistance Test Points Operating Voltages Operating Voltages Y SUS Supplied 5V Vcc Developed on Y SUS Z Bias Preliminary Information 42PQ30...
  • Page 72 Z SUS Waveform Z SUS Test Point Waveform Development Z SUS Output VS Input from the Y-SUS Z-Bias ADJ VR8 VZ (Z-Bias) TP Right side R49 or R50 Logic Signals from the Control PWB Also +15V and +5V Preliminary Information 42PQ30...
  • Page 73 J27 to check Z Output waveform. Right Hand side Center. Vzb voltage + - 1V 80 V Note: The Vzb Adjustment is a 50V/div 400uS/div DC level adjustment This Waveform is just for reference to observe the effects of Zbz adjustment Preliminary Information 42PQ30...
  • Page 74 Side R49 or R50 Set should run for 15 minutes, this is the “Heat Run” mode. Set screen to “White Wash” mode or 100 IRE White input. Measured from Chassis Ground Adjust VZ (Z-Bias) to Panel Label (± 1V) Preliminary Information 42PQ30...

  • Page 75: Control Pwb

    5V, 15V Z-SUS PWB Receives VS from 5V, 15V Y-SUS and 15V, 5V from Control PWB Circuits generate erase, Generates Z Bias 100V sustain waveforms Display Panel FET Makes Drive waveform Via FPC (flexible printed circuit ) Preliminary Information 42PQ30...
  • Page 76 ER COM *94.9V Open ER COM *94.9V Open Open Open *193V Open *193V Open * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 77 Z ER UP 0.19V 2.8V Z ER DN 0.4V 2.8V Z BIAS 1.9V 2.8V 0.8V Open CTRL_OE 1.9V Open 4.9V Open +15V 16.9V Open +15V 16.9V Open Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 78 Y and Z Sustain Drive Signals (Luminance) X Board Drive Signals (Color) Operating Voltages Operating Voltages Y SUS Supplied +5V (Also Routed to the Z-SUS) +15V (Routed to the Z-SUS) Developed on the +1.8V Control board (2) +3.3V Preliminary Information 42PQ30...
  • Page 79 6) 3.3V Y-SUS 7) 0V 8) 3.3V P111 IC101 Pin 1 EEPROM IC201 P101 3.3V IC252 3.3V To P2 Z-SUS FL204 D201 Vs DA AUTO GEN TEST Data 3.3V Protect 3.2V PATTERN P161 P162 To X Drive Left Preliminary Information 42PQ30...
  • Page 80 Control PWB Pictorial Control PWB Pictorial Note: IC221 (3.3V Regulator) routed out P161 / P162 to X-PWBs Preliminary Information 42PQ30...
  • Page 81 If there is a picture of cycling colors and patters, the Y-SUS, Y-Drive, Z-SUS, Power Supply, Control PWB, X-Boards, TCPs and Panel are all OK. Use the same test for problem (2)above to tell if the No Video is caused by the Main PWB or failed LVDS cable. Preliminary Information 42PQ30...
  • Page 82 1.5V ~ 1.8V X101 Osc. Check: 25Mhz Check the output of the Oscillator (Crystal). The frequency of the sine wave is 25 MHZ. Missing this clock signal will halt operation of the panel drive signals. CONTROL PWB CRYSTAL LOCATION Preliminary Information 42PQ30...
  • Page 83 Menu Button “on” and “off” with the Remote Control or Keypad. Loss of these Signals would confirm the failure is on the Main Board! Menu ON Menu Off Main PWB P1002 Example of Normal Signals measured at 200mv/cm at 5µs/cm. Preliminary Information 42PQ30...
  • Page 84 CONTROL PWB X-DRIVE PWB Resistor Array 16 line IC201 EEPROM DRAM 2 Buffer PANEL Outputs per TCP 128 Lines per Buffer 256 Lines output Total To X-Drive Boards Preliminary Information 42PQ30...
  • Page 85 Removing the LVDS Cable from the Control PWB The LVDS Cable has two “Interlocks” that must be disengaged to remove the LVDS Cable. To Disengage, press the two Locking Tabs Inward and pull the plug out. Press Press Inward Inward Preliminary Information 42PQ30...

  • Page 86: Pins 1, 2 And

    Pins 3, 4, 5, 6, and 7 and 12. Receive +5V from the Y-SUS. Pins 9, 10, 11 and 30 Are Ground All the rest are delivering Y-Drive logic signals to the Y-SUS Board Even Pins Pins Preliminary Information 42PQ30...
  • Page 87 The pin numbers are Silkscreen Label: correct. Remember The pin numbers are Odd pins on the left correct. Remember and even pins are on Odd pins on the left the right. and even pins are on the right. Preliminary Information 42PQ30...
  • Page 88 0.6V 2.8V Dummy 1 1.05V 2.8V Dummy 3 2.8V ER_UP 0.2V 2.8V Dummy 4 1.28V 2.8V SUS_UP 0.13V 2.8V CTRL_OE 0.1V 3.2V SET_DN 0.12V 2.8V Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 89 0.75V Open Z SUS Up 0.18V 0.65V Z ER Up 0.16V 0.65V Z ER Dn 0.3V 0.65V Z Bias 0.65V 0.07V 0.65V CTRL_OE 0.06V 0.65V Pin 1 at the bottom of the connector 4.9V 0.97V Open Open Preliminary Information 42PQ30...
  • Page 90 These pins are covered with tape for transportation issues. (Tape can be removed). P162 P161 Tape removed 3.3V 3.3V 3.3V created The rest of the pins are much too close together for a safe test. 3.3V by IC221 Preliminary Information 42PQ30...
  • Page 91 BUS) The X Drive PWBs deliver the Color drive signals to the Vertical Grids. The 42PQ30 has a Left and a Right X-Drive board. Each with 6 connectors to a TCP. And each TCP with 2 buffers. Each buffer controls 128 vertical grids lines.
  • Page 92 After a very short time, these ICs will begin to self destruct due to overheating. P233 P211 P232 LEFT X BOARD TCP IC P331 P311 RIGHT X BOARD TCP IC TCP IC’s shown are part of the Ribbon Cable Preliminary Information 42PQ30...
  • Page 93 TCP ICs supply RGB 16 bit signal to the PDP by connecting the PAD Electrode of the PANEL with the X Board. X Drive Board Y-SUS Board Logic Control Board Taped Carrier Package Heat Sink Back side of TCP Ribbon Preliminary Information 42PQ30...
  • Page 94 TCP Testing TCP Testing On any Gnd Typical Reverse leads 10,11,12,13,14,27,28,2 9,30,37,38,39,40,41 Reading 0.65V Reading Open On any Va 4,5,6,7,44,45,46,47 Look for any TCPs being discolored. Ribbon Damage. Cracks, folds Pinches, scratches, etc… Preliminary Information 42PQ30...
  • Page 95 TCPs removed. 3.3V Check for 3.3V Check for 3.3V P232 P331 Top C231 Top C363 Left Left C307 C206 Left X PWB Right X PWB 3.3V in on Pins 49-50-51 3.3V in on Pins 49-50-51 Preliminary Information 42PQ30...
  • Page 96 Generate abnormal vertical bars c) Cause the entire area driven by the TCP to be “All White” d) Cause the entire area driven by the TCP to be “All Black” e) Cause a “Single Line” defect Preliminary Information 42PQ30...
  • Page 97 Label STBY Diode Mode 15.4V Open VPP/ER1 *61.4V Open VPP/ER1 *61.4V Open *64.9V Open * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 98 P311 CONNECTOR "X Drive Right" to "X-Drive Left" P211 Label STBY Diode Mode Open VPP/ER2 *61.4V Open VPP/ER2 *61.4V Open *64.9V Open * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 99 Voltage and Diode Mode Measurements for these connectors are difficult to read. They are too close together for safe test. The pins are also protected by a layer of tape to prevent the tab from being released causing separation from the Cable and the connector. Preliminary Information 42PQ30...
  • Page 100 • DC Voltage and Waveform Checks • Resistance Measurements SMPS Supplied 5V Stand-By Operating Voltages Operating Voltages Developed on the Main 3.3V (2) Board 2.5V 1.8V Preliminary Information 42PQ30...
  • Page 101 IC504 SW100 Micro. 12 Mhz Tuner X501 25 Mhz IC201 P1005 Pin 19 Audio RGB/DVI LD501 Optical Audio Tuner RS232 IC805 RGB/PC Component inputs Audio In 3 Pin 1 HDMI inputs A/V Composite inputs Wired Remote S-In Preliminary Information 42PQ30...
  • Page 102 1) 0.6V 2) 1.8V 3) 3.3V 1) 0V 2) 3.3V 3) 5V IC304 IC201 IC201 1,2) 3.4V 3) 0V IC305 4) 3.4V 5,6,7,8) 0V IC502 1) 0.2V 2) 1.2V 3) 3.2V IC506 1) 3.8V 2) 5V 3) 8V Preliminary Information 42PQ30...
  • Page 103 Main PWB (Regulator Checks) Main PWB (Regulator Checks) Preliminary Information 42PQ30...
  • Page 104 Main PWB Tuner Check (Shield Off) Pins Exposed TU1001 Video Pin Video Test Point SIF Pin Audio Test Point Tuner B+ (5V) DIG IF (-) Pin DIG IF (+) Pin Digital Channel Test Point Data Pin Clock Pin Tuner B+ (5V) MAIN Tuner Location Preliminary Information 42PQ30...
  • Page 105 500mV / 10uSec Tuner Location Pin 16 “SIF” Pin 1 Signal 450mVp/p Pin 12 and Pin 13 “Dig IF” Signal 700mVp/p 200mV / 2uSec Note: “Dig IF” Signal only when 100mV / 1uSec receiving a Digital Channel. Preliminary Information 42PQ30...
  • Page 106 Main PWB Crystal X1 and X501 Check X1 (1.5V DC) / (2.4V p/p) 12Mhz Runs all the time X501 (1.5V DC) / (110mV p/p) 25Mhz X501 MAIN PWB Crystal Location Runs only at first turn on when LD501 is illuminated. LD501 Preliminary Information 42PQ30...
  • Page 107 Main PWB P1002 LVDS Video Signal Check Main PWB P1002 LVDS Video Signal Check USING GRAY SCALE SIGNAL INPUT Pin 11 10uSec per/Div Pin 11 2uSec per/Div Pin 1 P1002 Location Pin 18 MAIN PWB 10uSec per/Div Pin 18 2uSec per/Div 700mVp/p Preliminary Information 42PQ30...
  • Page 108 1.25V 0.85V 1.21V 0.85V 1.27V 0.77V 1.21V 0.91V 1.22V 0.77V 1.25V 0.81V 1.24V 0.77V 1.21V 0.85V 1.24V 0.85V 1.18V 0.77V 0.58V 1.01V 3.29V 1.3V 2.81V 0.49V Resistance Readings with the PWB Disconnected. DVM in the Diode mode. Preliminary Information 42PQ30...
  • Page 109 LED-W 03.25 Open * Pin 5 (Power Key) This pin is 0V when the button is lock “On” (In) and 5V when Locked “Off” (Out) Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 110 5V Det .15V 2.98V AC Det Open RL On 3.73V Open VS On 3.2V Open M5 ON 3.24V Open Auto Gnd Key On Open Stby 5V 1.06V Resistance Readings with the PWB Disconnected. DVM in the Diode mode. Preliminary Information 42PQ30...
  • Page 111 Voltage and Diode Mode Measurements for the Main Board Speaker Plug P1005 CONNECTOR "Main" to "Speakers" Label Diode Mode 8.65V Open 8.65V Open 8.65V Open 8.65V Open P1005 Speaker Connector Board MAIN Location Resistance Readings with the PWB Disconnected. DVM in the Diode mode. Preliminary Information 42PQ30...
  • Page 112 Then remove the 2 screws from the Front IR and Power LED PWB. Remove J1connector. FRONT KEY PWB NEW: Master Power Switch Set will not function With this Mechanical” switch down in the Screw Screw open position. Screws FRONT IR and POWER LED PWB P101 FRONT KEY PWB folded back Preliminary Information 42PQ30...
  • Page 113 The Ft Power LED PWB includes the IR Receiver and the Intelligent Sensor. The Front POWER LED is also located on this board. FRONT POWER IR Sensor INTELLIGENT Sensor Front View To Main PWB Back View To Front Keys Preliminary Information 42PQ30...
  • Page 114 3.28V 2.5V when it is locked “Off” EYE-SDA 3.28V 2.5V (Out) 5VST 1.06V Stand By 5V 3.3VST 5.13V 1.1V LED-R 3.3V 3.22V LED-W 03.25 Open Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 115 J2 CONNECTOR “Ft LED PWB" to "Ft Keys" *STBY1 *STBY2 Diode Mode J2 Pin 3.29V 3.29V Open 3.29V 3.29V Open 4.38V *STBY2 Main Power Switch “IN” Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 116 The Ft Key PWB contains the Master Power Switch, Volume Up/Down and Channel Up/Down keys. Also the Menu and Select keys. P101 To Front LED PWB Rear View Main Power Front View Switch Front View Back View Preliminary Information 42PQ30...
  • Page 117 P101 CONNECTOR “Ft Key PWB" to "Ft LED" *STBY1 *STBY2 Diode Mode 3.29V 3.29V Open 3.29V 3.29V Open 4.38V Open P101 Pin *STBY2 Main Power Switch “IN” Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 118 Diode Mode Readings Cushion Cushion taken with all connectors Disconnected. DVM in Speaker Diode Mode. At the top of the speaker is a rubber cushion. Be sure to return this to its proper position to prevent vibrations. Preliminary Information 42PQ30...
  • Page 119 This section shows the 11X17 foldout that ’ s available in the Paper This section shows the 11X17 foldout that ’ s available in the Paper and Adobe version of the Training Manual. and Adobe version of the Training Manual. Preliminary Information 42PQ30...
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  • Page 121 42PQ30 CIRCUIT INTERCONNECT DIAGRAM Y-DRIVE WAVEFORM VR601 SMPS Test – Unplug P813 If all supplies do P813 V Set-Up (Ramp) Waveform TP not run when A/C is reapplied, disconnect P811 Label STBY Run No Load On Y-Drive PWB P811 to isolate the excessive load. This...
  • Page 122 Connector P1002 Configuration - indicates signal pins.
  • Page 123 This page intentionally left blank...

  • Page 124: Thank You

    End of Presentation End of Presentation This concludes the Presentation Thank You Preliminary Information 42PQ20...

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