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LG 42PQ30 Training Manual
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LG 42PQ30 Training Manual

LG 42PQ30 Training Manual

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See also: Owner's Manual , Training Manual
Training Manual
Advanced Single
42PQ30 Plasma Display
42PQ30 Plasma Display
Scan Troubleshooting
NOTICE:
ALL INFORMATION CONTAINED WITHIN THIS PACKAGE IS
BASED ON PRE-SALES MODEL. INFORMATION SUBJECT TO
CHANGE AT FINAL PRODUCTION
Original February 16
Updated: April 21
2009
th,
, 2010
st

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Summary of Contents for LG 42PQ30

  • Page 1 Training Manual 42PQ30 Plasma Display 42PQ30 Plasma Display Advanced Single Scan Troubleshooting NOTICE: ALL INFORMATION CONTAINED WITHIN THIS PACKAGE IS BASED ON PRE-SALES MODEL. INFORMATION SUBJECT TO CHANGE AT FINAL PRODUCTION Original February 16 2009 Updated: April 21 , 2010...
  • Page 2 • Y Drive Boards (Receives Y Drive signals from Y-SUS Board) • 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: Preliminary Matters (The Fine Print)

    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: Esd Notice

    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: Lg Contact Information

    New Training Materials on Alignment Handbook Plasma page Plasma page the Learning Academy site the Learning Academy site Published February 2010 by LG Technical Support and Training LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813. February 16 , 2009...

  • Page 7: Plasma Overview Section

    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: Basic Troubleshooting Steps

    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 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: 42Pq30 Specifications Logo Familiarization

    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: 42Pq30 Specifications Fluidmotion Familiarization

    42PQ30 Specifications FluidMotion Familiarization 42PQ30 Specifications FluidMotion Familiarization FluidMotion (180 Hz Effect) Enjoy smoother, clearer motion with all types of programming such as sports and action movies. The moving picture resolution give the impression of performance of up to 3x the panels actual refresh rate.

  • Page 14: 42Pq30 Remote Control

    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

    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 42PQ30 Circuit Board Layout Panel ID Label Y Drive Panel Voltage Label Power Supply (SMPS) Board Z-SUS Board Y SUS Board Side Input (part of main) Control Board Heat Sink Main Board AC In Right “X”...

  • Page 20: Disassembly Procedure For Circuit Board Removal

    Remove the Board by lifting slightly and sliding the Board to the left unseating P204 and P200 from the Y-SUS Board. Note: Board 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 Boards in place (8 total) Remove the Boards. Preliminary Information 42PQ30...
  • Page 22 X-DRIVE Boards REMOVAL: Disconnect all TCP ribbon cables from the defective X-Drive Board. Remove the 4 screws holding the Board in place. Remove the Board. 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 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: Left And Right X Drive Removal

    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 Board or 7 total for both. (The Center screw secures both Boards) 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: Circuit Operation, Troubleshooting And Circuit Alignment Section

    CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTION 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: Panel Label Explanation

    (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: Adjustment Notice

    1) When the Y-SUS Board 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: Switch Mode Power Supply Troubleshooting

    Set-Up and Ve are just for Label location identification and are not adjusted in this panel. SMPS P/N EAY58349601 Check the silk screen label on the top center of the Board of the Power Supply itself to identify the Board P/N. We will examine the Operation of this Power Supply. Preliminary Information 42PQ30...

  • Page 32: Power Supply Board Layout

    Power Supply Board Layout Power Supply Board Layout Hot Ground Symbol represents a SHOCK Hazard P811 P813 5V Det AC Det RL ON VS ON M5 ON Auto Gnd 23 Stby5V Key On Preliminary Information 42PQ30...

  • Page 33: Switch Mode Power Supply Overview

    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 34: Switch Mode Power Supply Circuit Layout

    338V Stby 388V Run Fuse F801 VS VR901 4Amp/250V VA VR502 338V Stby 388V Run Fuse F302 STBY 5V IC701 Sub Micon 17V, 12V 1Amp/250V Source Main Fuse F101 P813 AC Input 6.3Amp/250V SC 101 To MAIN Preliminary Information 42PQ30...

  • Page 35: Power Supply Basic Operation

    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 36 42PQ30 Power Supply Turn On Sequence 42PQ30 Power Supply Turn On Sequence POWER SUPPLY Y-SUS PWB (SMPS) 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 37: Power Supply Generic Troubleshooting Tips

    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 38 (Remember, Vs is routed to the Z-SUS Board 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 Board will function. Preliminary Information 42PQ30...
  • Page 39 Static Test with Light Bulb Load on Power Supply Static Test with Light Bulb Load on Power Supply Preliminary Information 42PQ30...

  • Page 40: Switch Mode Power Supply Static Test

    (E) 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 41 SMPS Va and Vs Adjustments Important: Use the Panel Label Not this book for all voltage adjustments. Va TP P811 Use Full White Raster “White Wash” Pin 6 or 7 Vs TP P811 Pin 1 or 2 Preliminary Information 42PQ30...

  • Page 42: P813 Odd Pins Id And Voltage And Diode Checks

    Stby 5V Open *Key On Open *Note: If the Key On line is 4.38V, the Main Power Switch is open. Stand-By 5V will shut off. Diode Mode Readings taken with all Connectors Disconnected. DVM in Diode Mode. 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: Y - Sus Board Section (Overview)

    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 45: Y - Sus Board Layout

    Control Board Pins 7, 8, 9, 10 and 11 P202 VSC ADJ P202 Logic (Drive) Signals to -VY ADJ 15V TP VR501 Va to Left X Board the Y Drive Boards VR502 J269 Pins 1, 2 and 3 Preliminary Information 42PQ30...
  • Page 46 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 Boards Bottom Connector P207 Preliminary Information 42PQ30...

  • Page 47: Vsc And - Vy Adjustments

    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 Board Preliminary Information 42PQ30...

  • Page 48: Y - Drive Signal Overview

    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 49 Left Side Right Side Fig 4: At 40uSec per/division, the adjustment for can be made. SET-UP Fig 5: Area to At 40uSec per/division, the adjustment for be adjusted can be made. SET-DN Fig 4 40uS Fig 5 40uS Preliminary Information 42PQ30...
  • Page 50 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 51 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 52 Board 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 53: Y Sus Block Diagram

    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 54: Y - Sus How To Check The Output Fets

    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 55 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 56 P202 Connector "Y-SUS Board" 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 57: Y - Sus P801 To Z Drive P1 Voltage And Diode Checks

    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 58 Run: 5V Diode Check: 1.1V 15V Test Point 17V to run the Z-SUS Board. Routed out P101 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 59 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 60 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 61: Y - Sus P207 (Drive Output Plug) Testing

    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 Ground Meter in the Diode Mode Y-Drive Preliminary Information 42PQ30...

  • Page 62: Y - Sus Fg5V, Fg15V And 17V Testing

    FG9V D509 D508 Cathode FG20V Source D506 Cathode 17V Source D509 Cathode FG9V Source FG 5V Read 17V from Chassis Ground Read FG voltages from Floating Ground Use External 5V Source connected to M5V Input for test. Preliminary Information 42PQ30...

  • Page 63: Y - Drive Board Section

    Y SUSTAIN Board 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 64 P101, P103, P102 and pins 1 and 7 of P104 SIDE 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 65 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 transformer. transformer. 9) OC1 2.3V 10) DATA 11) Nc 12) SUS_DN FGnd Preliminary Information 42PQ30...

  • Page 66: Y - Drive Board Buffer Troubleshooting

    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 67 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 68 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 69: Y Drive Buffer Troubleshooting

    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 70: Z - Sus Board Section

    • DC Voltage and Waveform Test Points Locations • Z BIAS Alignment • Resistance Test Points Operating Voltages Operating Voltages Y SUS Supplied Developed on Y SUS and sent through the 5V Vcc Control Board Developed on Y SUS Z Bias Preliminary Information 42PQ30...

  • Page 71: Z - Sus Board Layout

    Z SUS Z SUS Waveform Waveform Test Point 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 Board Also +15V and +5V Preliminary Information 42PQ30...

  • Page 72: Z - Sus Waveform

    J27 to check Z Output waveform. Right Hand side Center. Vzb voltage + - 1V 80 V 50V/div 400uS/div Note: The Vzb Adjustment is a DC level adjustment This Waveform is just for reference to observe the effects of Zbz adjustment Preliminary Information 42PQ30...

  • Page 73: Vz (Z - Bias) Adjustment

    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 74: Z - Sus Block Diagram

    5V, 15V Z-SUS Board Receives VS 5V, 15V from Y-SUS and 15V, 5V from Control Board Circuits generate erase, Generates Z Bias 100V sustain waveforms Display Panel FET Makes Drive waveform Via FPC (flexible printed circuit ) Preliminary Information 42PQ30...
  • Page 75 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 76: Z - Sus P2 Connector To Control P101 Voltage And Diode Checks

    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 77: Control Board Section

    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 78: Control Board Identified

    6) 3.3V Y-SUS 7) 0V 8) 3.3V P111 IC101 Pin 1 EEPROM IC201 3.3V P101 IC252 To P2 3.3V 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 79 42PQ30 INTERCONNECT DIAGRAM CONTROL BOARD BLOW UP 42PQ30 INTERCONNECT DIAGRAM CONTROL BOARD BLOW UP Troubleshooting Tips Troubleshooting Tips Unplug all connectors. Jump 5V from SMPS (P813 pins 9~12) to pin 1 of IC211. Observe LED. If it blinks, most likely Control PWB is OK.

  • Page 80: Control Board Testing

    If there is a picture of cycling colors and patters, the Y-SUS, Y-Drive, Z-SUS, Power Supply, Control Board, 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 Board or failed LVDS cable. Preliminary Information 42PQ30...
  • Page 81 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 Board CRYSTAL LOCATION Preliminary Information 42PQ30...

  • Page 82: Control Lvds Signals

    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 Board P1002 Example of Normal Signals measured at 200mv/cm at 5µs/cm. Preliminary Information 42PQ30...
  • Page 83 CONTROL Board X-DRIVE Board 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 84 Removing the LVDS Cable from the Control Board 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 85 Control and out to the Z-SUS, leaving on P101 Pins 10. 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 86: Control Board Connector P111 Silkscreen Can Be Misleading

    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 87 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 88: Control P101 To Z - Sus P2 Plug Information

    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 89 These pins are covered with tape for transportation issues. (Tape can be removed). P162 P161 Tape removed 3.3V 3.3V The rest of the pins are much too 3.3V created close together for a safe test. 3.3V by IC221 Preliminary Information 42PQ30...

  • Page 90: Left And Right X Boards Section

    BUS) The X Drive Boards 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 91 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 92 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 93 TCP Testing TCP Testing On any Gnd 10,11,12,13,14,27,28,2 Typical Reverse leads 9,30,37,38,39,40,41 Reading 0.65V Reading Open On any Va or 3.3V 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 94: Tcp 3.3V B+ Check

    3.3V source to destination. 3.3V Check for 3.3V Check for 3.3V P232 P331 Top C231 Top C363 Left Left C307 C206 Left X Right X Board 3.3V in on Pins 49-50-51 3.3V in on Pins 49-50-51 Board Preliminary Information 42PQ30...
  • Page 95 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 96 P233 Connector “Left X-Board" to “Y-SUS” Left P202 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 97 *64.9V Open * Note: This voltage will vary in accordance with Panel Label P211 "X Drive Left" P231 "X Drive Right" Pin 1 Pin 1 Diode Mode Readings taken with all Connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 98 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 99: Main Board Section

    Voltage and Diode Checks test points needed for troubleshooting and alignments. • DC Voltage and Waveform Checks • Resistance Measurements 5V Stand-By Operating Voltages Operating Voltages SMPS Supplied Developed 3.3V (2) on the Main 2.5V Board 1.8V 8V then to 5V for Tuner Preliminary Information 42PQ30...

  • Page 100: Main Board Layout And Identification

    IC504 25 Mhz SPK Out HDMI 3 IC1001 Pin 19 P1005 Audio RGB/DVI LD501 Optical Audio Tuner IC805 Component inputs Audio In 3 Pin 1 HDMI inputs RS232 RGB/PC A/V Composite inputs RF IN S-In Wired Remote Preliminary Information 42PQ30...
  • Page 101 42PQ30 Main Board Regulator Checks (Front Side) 42PQ30 Main Board Regulator Checks (Front Side) IC302 IC203 P1002 LVDS P1006 IC204 IC503 X501 IC504 L1012 IC1001 SW301 MAIN BOARD (19) L1013 IC805 TU501 TUNER (4) +5V 8V regulator 3.1V REG EDID...
  • Page 102 42PQ30 Main Board Regulator Checks (Back Side) 42PQ30 Main Board Regulator Checks (Back Side) IC301 IC304 P1006 3.3V_ST 1.8V_MST P1002 Regulator regulator Q303 5VMST Switch IC202 IC201 HDCP NVRAM IC305 EEPROM 3.3V_MST Regulator IC502 +1.2V PVSB regulator MAIN PWB (Back Side View)
  • Page 103 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 Board Tuner Location Preliminary Information 42PQ30...
  • Page 104 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 105: Main Board Crystal X1 And X501 Check

    Main Board 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 Board Crystal Location Runs only at first turn on when LD501 is illuminated. LD501 Preliminary Information 42PQ30...
  • Page 106 Main Board P1002 LVDS Video Signal Check Main Board 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 Board 10uSec per/Div Pin 18 2uSec per/Div 700mVp/p Preliminary Information 42PQ30...
  • Page 107 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 Board Disconnected. DVM in the Diode mode. Preliminary Information 42PQ30...

  • Page 108: Main Board Plug P1001 To Ft Keys Voltage And Diode Checks

    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 109 5V Det .15V 2.98V AC Det Open VS On 3.2V Open RL On 3.73V Open M5 ON 3.24V Open Auto Gnd *Key On Open Stby 5V 1.06V Resistance Readings with the Board Disconnected. DVM in the Diode mode. Preliminary Information 42PQ30...

  • Page 110: Main Board Speaker Plug P1005 Voltage And Diode Checks

    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 Board Resistance Readings with the Board Disconnected. DVM in the Diode mode. Preliminary Information 42PQ30...
  • Page 111 Then remove the 2 screws from the Front IR and Power LED Board. Remove J1Connector. FRONT KEY Board 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 Board P101 FRONT KEY Board folded back Preliminary Information 42PQ30...
  • Page 112 The Ft Power LED Board 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 Board Back View To Front Keys Preliminary Information 42PQ30...

  • Page 113: Front Led Board Plug J1 To Main Voltage And Diode Checks

    5VST 1.06V * Pin 5 (Power Key) 3.3VST 5.13V 1.1V When this switch is out, Stand-By 5V turns off. 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 114 Label *STBY1 *STBY2 Diode Mode Key 1 3.29V 3.29V Open Key 2 3.29V 3.29V Open PWR Key 4.38V Open *STBY2 Main Power Switch “IN” Normal Diode Mode Readings taken with all Connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...
  • Page 115 The Ft Key Board contains the Master Power Switch, Volume Up/Down and Channel Up/Down keys. Also the Menu and Select keys. P101 To Front LED Board Rear View Main Power Front View Switch Front View Back View Preliminary Information 42PQ30...
  • Page 116 3.29V Open Key 2 3.29V 3.29V Open PWR Key 4.38V Open *STBY1 Main Power *STBY2 Main Power P101 Pin Switch “OUT” Vacation Switch “IN” Normal Diode Mode Readings taken with all Connectors Disconnected. DVM in Diode Mode. Preliminary Information 42PQ30...

  • Page 117: Invisible Speaker Section

    Diode Mode Readings taken with all Connectors Cushion Cushion Disconnected. DVM in Diode Mode. Speaker 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 118 When Printing the Interconnect diagram, print from the Adobe When Printing the Interconnect diagram, print from the Adobe version and print onto 11X17 size paper for best results. version and print onto 11X17 size paper for best results. Preliminary Information 42PQ30...
  • Page 119 42PQ30 CIRCUIT INTERCONNECT DIAGRAM 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.
  • Page 120 Connector P1002 Configuration - indicates signal pins.
  • Page 121 End of Presentation End of Presentation This concludes the 42PQ30 Presentation Thank You Preliminary Information 42PQ30...

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