Panasonic GP6DU Technical Manual
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Panasonic GP6DU Technical Manual

Plasma training course
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Technical Guide
Plasma Training Course
GP6DU, GPH6DU, and GPH7D (Onyx)
Chassis
Troubleshooting
Panasonic Services Company
National Training

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Summary of Contents for Panasonic GP6DU

  • Page 1 Technical Guide Plasma Training Course GP6DU, GPH6DU, and GPH7D (Onyx) Chassis Troubleshooting Panasonic Services Company National Training...
  • Page 2 "HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC." BBE, the BBE logo, Sonic Maximizer and High Definition Sound are registered trademarks or trademarks of BBE Sound, Inc. Copyright © 2005 by Panasonic Services Company All rights reserved. Unauthorized copying and distribution is a violation of law.

  • Page 3: Table Of Contents

    Table of Contents Introduction ......................1 Model Line Up .....................3 New Features and Circuit Improvements ............5 Boards Layout.....................9 TH-42PD25U Boards Layout (GP6DU)...............9 TH-42PX25U Boards Layout (GPH6DU) ............9 TH-50PX25U Boards Layout (GPH6DU) ............10 TH-42XVS30 (Onyx) Boards Layout (GPH7D)..........10 TH-50XVS30 (Onyx) Boards Layout (GPH7D)..........11 TH-65XVS30 (Onyx) Boards Layout (GPH7D)..........11...
  • Page 4 TH-42PX25U-P Power-On with Remote Control..........38 Power-on Operation (TH-65XVS30U)...............41 Power-On with Switch on Front Panel............41 Power-On with Remote Control ..............42 Protection Circuits....................45 TH-42PD25U-P Protection Circuits..............45 TH-42PD25U PA board SOS detect..............47 TH-42PD25U 3.3V SOS detect ..............51 TH-42PD25U SC and SS SOS Detect ............52 Troubleshooting chart for the TH-42PD25U ...........57 Power LED blinks 2 Times................57 Power LED blinks 3 Times................58...
  • Page 5 Troubleshooting chart for the TH-42XVS30............99 Power LED blinks 2 Times................99 Power LED blinks 3 Times................100 Power LED blinks 4 Times................101 Power LED blinks 5 Times................102 Power LED blinks 7 Times................102 Power LED blinks 7 Times................103 Power LED blinks 9 Times................104 Power LED blinks 12 Times................105 Service Notes ....................107 TH-37PA20U TH-42PA20U (Service Hint SH-B19-04-06)......107...

  • Page 7: Introduction

    Introduction This technical guide was prepared with the following objectives in mind: • Provide the servicer with a brief overview of the concepts of operation for new circuits employed in this line of Plasma models. • Provide drawings with emphasis on signal path to simplify the task of signal tracing and to locate the cause of a defect.

  • Page 9: Model Line Up

    Model Line Up TH-37PD25U 37-inch 480p Version TH-37PX25U 37-inch 480p/1080i Version (720p PC Only) 2 Component Video Inputs 2 Component Video Inputs 3 Composite Video Inputs 3 Composite Video Inputs 3 S-Video Inputs 1 HDMI / HDCP input 3 S-Video Inputs 1 Tuner _NTSC/ATSC/QAM (SDTV and 1 HDMI / HDCP input 1 Tuner _NTSC/ATSC/QAM (SDTV and...
  • Page 10 TH-42XVS30UP TH-50XVS30UP 42-inch HD Version (720p via PC input 50-inch HD Version (720p via PC input only) only) Digital Multimedia Receiver Digital Multimedia Receiver 2 Component Video Inputs 2 Component Video Inputs 3 Composite Video Inputs 3 Composite Video Inputs 3 S-Video Inputs 3 S-Video Inputs 1 HDMI / HDCP input...

  • Page 11: New Features And Circuit Improvements

    New Features and Circuit Improvements Dedicated media receiver • Built-In NTSC Tuner • Built-In ATSC Tuner • Built-In QAM Tuner • Cable-Card Ready • BBE VIVA HD 3D • AI Sound Control • 3 A/V Input (Composite or S-Video) • 2 Component Video Inputs •...
  • Page 12 Color Purity Optimizer • Works in 3 dimensions brightness, color and hue • Precision control for vibrant colors • Vibrant colors will stand out better while skin tones will remain natural Motion Pattern Noise Reduction • New technology detects patterns that generate noise •...
  • Page 13 1366x768 1536 Up to 3000:1 TH-42PX25U/P GPH6DU 1024x768 1536 Up to 3000:1 TH-37PX25U/P GPH6DU 1024x720 1536 Up to 3000:1 TH-42PD25U/P GP6DU 852x480 1536 Up to 4000:1 TH-37PD25U/P GP6DU 852x480 1536 Up to 4000:1 GPH7D TH-42XVS30 1024x768 1536 Up to 3000:1...

  • Page 15: Boards Layout

    Boards Layout TH-42PD25U Boards Layout (GP6DU) Figure 1 - TH-42PD25U boards layout TH-42PX25U Boards Layout (GPH6DU) Figure 2 - TH-42PX25U boards layout...

  • Page 16: Th-50Px25U Boards Layout (Gph6Du)

    TH-50PX25U Boards Layout (GPH6DU) Figure 3 - TH-50PX25U boards layout TH-42XVS30 (Onyx) Boards Layout (GPH7D) Figure 4 - TH-42XVS30 Board Layout...

  • Page 17: Th-50Xvs30 (Onyx) Boards Layout (Gph7D)

    TH-50XVS30 (Onyx) Boards Layout (GPH7D) Figure 5 - TH50XVS30 Board Layout TH-65XVS30 (Onyx) Boards Layout (GPH7D) Figure 6 - TH65XVS30 Board Layout...

  • Page 19: Video Block

    Video Block GP6DU and GPH6DU Chassis The GPH6DU, and the GP6DU series plasma panels incorporate two tuners. The main Digital Tuning System is used for primary picture operation. It provides component and composite video and audio output signals from its ATSC, NTSC, and QAM tuners.
  • Page 20 Figure 7 - Video Block Diagram...
  • Page 21 Figure 8 - H Board Block Diagram...
  • Page 23 Figure 9 - H Board Block Diagram...
  • Page 24 Figure 10 - DG Board Block Diagram...
  • Page 25 Note: To connect an external device that has a DVI output to a plasma panel model that has an HDMI input only, use an adaptor cable and connect the Audio signal to the Audio jacks located below the HDMI input. An HDMI-DVI conversion cable (TY- SCH03DH) is available from Panasonic parts department.
  • Page 26 GPH6DU Chassis Photo Viewer Signal Process Figure 12 - Photo Viewer Signal Process Images from a SD or PCMCIA card, inserted into the Photo Viewer card slot, are transferred to the DV-Board. After buffering, the JPEG information is decoded by IC6013 and converted to luminance and chrominance data.

  • Page 27: Gph7D (Onyx)

    GPH7D (Onyx) ONYX J Board Video Selector Figure 13 - J Board Video Selector Onyx plasma panel models incorporate three video inputs. IC3005 selects between “Y, Pb, Pr” and RGB signals that are output by the DR, Slot-2, and HX boards. The “Y, Pb, Pr”...

  • Page 28: Onyx J Board Sync Selector

    ONYX J Board Sync Selector Figure 14 - J Board Sync Selector RGB/PC Input Mode The vertical and horizontal sync signals of the input video signals are applied via connector J11, J12 or HX1 to the Sync selector IC, IC8001. The selected vertical and horizontal sync signals are then output to the sync processor IC, IC8003.

  • Page 29: Onyx Dr Board Block Diagram

    ONYX DR Board Block Diagram Figure 15 - DR Board Block Diagram RGB signals output by the receiver box are input to the DR board via pins 1, 2, and 3 of the socket CN3300. Upon entry to the DR-board, these signals are buffered by the transistors Q3300, Q3301, and Q3302 and then output to IC3309 for video input selection.
  • Page 30 CN3301, a connector that resembles a DVI port, is designed to receive digital video from the receiver box. The HDCP (High-bandwidth Digital Content Protection) circuit monitors the applied signals for copyright protection. Serial data that originates in the receiver box is converted to parallel by IC3303, and back to serial by IC3305. This is done to remove noise that may have been introduced into the long cable that connects the receiver box and the display unit.

  • Page 31: Onyx Rgb/Sync Analog To Digital Conversion

    Onyx RGB/Sync Analog to Digital Conversion Figure 16 - D Board GB to Analog Conversion he selected RGB signals enter the D-board via pins 4, 8, and 12 of the connector J1/DG1. IC9869 performs analog to digital conversion and the resulting digital data output to IC9501.

  • Page 32: Onyx Data Drive Operation

    Onyx Data Drive Operation Figure 17 - Data Drive Operation The digital signal process is performed on the D-board. The analog RGB input signals are converted to digital by IC9009 (not shown in this diagram). The 8-bit digital output data enters IC9501 for processing. The scan format of the digital video data is converted to progressive and mixed with the OSD data.

  • Page 33: Gph7D (Onyx) Tuner Receiver

    GPH7D (Onyx) Tuner Receiver Onyx models have separate Tuner Receivers. This receiver connects to the monitor using t 21” cables combined in one harness (P/N K1V245L20001). Figure 18 - Connecting Cables All input and output connections are located on the receiver. Figure 19 - Tuner Receiver...

  • Page 34: Photo Viewer

    Photo Viewer Compatible card types and maximum card sizes SD card slot • SD Card (512MB) • Multi Media Card (128MB) • Mini SD Card (128MB) Figure 20 - SD and PCMCIA Slots Figure 21 - SD Card PCMCIA card slot •...

  • Page 35: Power-On Operation

    Power-on Operation Power-on Operation (TH-42PD25U) TH-42PD25U-P Standby Circuit. Refer to figure 24. When the unit is plugged into the AC line, the PF-board provides filtered AC voltage to the P-board through the connector P9. The AC is applied to a standby circuit (D404, T410 and IC409) where the standby 7V is generated.

  • Page 36: Th-42Pd25U-P Power-On With Remote Control

    The microprocessor (IC9709) on the D-board sends a “High” on its pin 45 to the P- Board via pin 2 of connector D27/P27. The relay driver Q401 activates the relay, supplying AC to D451/IC451. The resulting 380VDC is used to power the switching regulator of IC552/T502.
  • Page 37 Figure 23 - TH-42PD25U Power on operation...
  • Page 39 How to troubleshoot a “no power condition for the TH-42PD25U Is the power LED red at power up? Does the voltage at pin 2 of P27 go high when power is turned on? Is 5V present on pin 4 of connector P27 on the P board? The P board is Is the voltage high at pin 9 of PF10...

  • Page 41: Power On Operation (Th-42Px25U)

    Power On Operation (TH-42PX25U) TH-42PX25U-P CPU Requirements and Standby Circuit. Refer to figure 24. When the unit is plugged into the AC line, the PF board provides filtered AC voltage to the P-board through the connectors PF2 and P9. The AC is applied to a standby circuit (D404, T410 and IC409) where the standby 7V is generated.
  • Page 43 Figure 24 - TH-42PX25U Power on operation...

  • Page 44: Th-42Px25U-P Power-On With Switch On Front Panel

    TH-42PX25U-P Power-On with Switch on Front Panel Refer to figure 25. When the unit is connected to the AC, the “Standby” powers-up the microprocessor IC001. As soon as the “Reset” operation of IC001 is complete, its pin 48 goes “High”. The “High” from pin 48 is routed through pins 36 of connector DG2/PA2 and pin 9 of connector PA10/PF10 to the base of the transistor Q909 on the PF-board, turning it on.
  • Page 45 Figure 25 - TH-42PX25U-P Power on operation...
  • Page 46 How to troubleshoot a “no power condition for the TH-42PX25U Is the power LED red at power up? Does the voltage at pin 2 of P27 go high when power is turned on? Is 5V present on pin 4 of connector P27 on the P board? The P board is Is the voltage high at pin 9 of PF10...

  • Page 47: Power-On Operation (Th-65Xvs30U)

    Power-on Operation (TH-65XVS30U) Refer to figure 26. On the Onyx line of Plasma TV, power can be turned on whether the tuner box is connected or not. This is done to isolate defects when troubleshooting this The power switch is of the latch type, and is located on the side of the TV. When the power switch is pressed, the TV comes on and it displays “NO SIGNAL”...

  • Page 48: Power-On With Remote Control

    “High” via pin 6 of connector P700/PC700 to the base of Q501 on the P-Board. Q501 turns on providing a current return path for the coil of RL403. RL403 turns on and applies AC to the rectifier D401. The 5V source is routed through the D, the C5, and the C4 boards to power the Remote Control Receiver on the V1 board.
  • Page 49 Figure 26 - TH-65XVS30 Power On operation...
  • Page 50 How to troubleshoot a “no power” condition for the TH-65XVS30 Can 5V be measured on pin 4 of connector P27 when turning the power on? Does pin 2 of P27 of the P board SS go Does pin 11 of P700 of the SS Power board go high? high? Does pin 6 of P700 of the SS Power...

  • Page 51: Protection Circuits

    Protection Circuits TH-42PD25U-P Protection Circuits Protection circuits are incorporated in the unit to prevent the failure of a single circuit or a component from creating catastrophic damage. A shutdown occurs when an over voltage condition, a short, or a drop in any of the voltage lines occurs.
  • Page 52 When an abnormality has occurred, the unit protection circuit operates and the TV is reset to the stand-by mode. When that occurs, the defective block can be identified by the number of blinks of the POWER LED on the front of the unit. The following table identifies the areas where a problem is suspected according to the number of times that the POWER LED blinks.

  • Page 53: Th-42Pd25U Pa Board Sos Detect

    TH-42PD25U PA board SOS detect Transistor Q7541 on the PA board monitors the UNR24V, the UNR10V, and the +9V. If any of these supply lines develop a short circuit, transistor Q7541 goes into conduction and applies a high to pin 69 of the MPU, IC001, through pin 33 of connector PA2 on the PA board.
  • Page 55 Figure 28 - TH-42PD25U PA board SOS detect...

  • Page 57: Th-42Pd25U 3.3V Sos Detect

    TH-42PD25U 3.3V SOS detect The Unregulated 15V and 1.8V lines are monitored for a voltage decrease. Under normal conditions, the voltage drop derived from the voltage divider circuits at the base of Q9714 or Q9716 is enough to turn the transistor on. However, should the voltage drop decrease, either Q9716 or Q9714 turns off, allowing 5 volts at their collectors to forward bias transistor Q9715.

  • Page 58: Th-42Pd25U Sc And Ss Sos Detect

    TH-42PD25U SC and SS SOS Detect The Scan and Sustain voltages on the SC and SS boards are monitored in a similar manner. The +15V Line on the SS board is fed to a voltage divider and the result is compared to a reference voltage.
  • Page 59 Figure 31 - SS board SOS Detect...
  • Page 60 Power LED blinking timing chart for the TH-42PD25U-P Number of Times the Power LED Blinks SOS2 (pin 12 SC20 on SC Board) 3.3V SOS (Pin 1 P25) 5V SOS (Pin 5 P25) Power Supply SOS (Pin 7 of connector P27) SOS1 (Scan Driver 2) pin 11 SC20 on SC Board) SUS Driver pin9 SS23 (L719) “SS”...
  • Page 61 TH-42PD25U-P Note: The numbers followed by the letter “X” within this picture indicate the number of times the “POWER” LED flashes. Figure 32 - TH-42PD25U...

  • Page 63: Troubleshooting Chart For The Th-42Pd25U

    Troubleshooting chart for the TH-42PD25U Power LED blinks 2 Times Is the voltage low at pin12 of connector SC20 on the SC board? Replace the D board Is 15V present on TP15V on the SC board? Replace the P board Replace the SC board SC Board...

  • Page 64: Power Led Blinks 3 Times

    Power LED blinks 3 Times Is 12V present on pin 1 of connector P25 on the “P” board? Are5V present Replace the D on pin 5 of board connector P25 on the “P” Replace the P board P Board D & PA Boards P Board...

  • Page 65: Power Led Blinks 4 Times

    Power LED blinks 4 Times Is 5V present on pin 5 of connector P25 on the “P” board? Replace the P Replace the D board board P Board D & PA Boards P Board...

  • Page 66: Power Led Blinks 5 Times

    Power LED blinks 5 Times Does the voltage at pin 7 of connector P27 go low? Replace the Replace the “P” “D” board board P Board P board D & PA board...

  • Page 67: Power Led Blinks 7 Times

    Power LED blinks 7 Times Is the red LED (D6583) on the SC board lit? Does the Replace the “D” Board voltage at pin 11 of SC20 go low? Replace the SC board. Check voltage at pin11 of SC20 using Note: Both, the SU and the SD boards a peak-hold meter.

  • Page 68: Power Led Blinks 9 Times

    Power LED blinks 9 Times Is the red LED on the SS board lit? Does the Replace the “D” Board voltage at pin9 of SS23 (L719) go low? Replace the SS board SS board SS board...

  • Page 69: Power Led Blinks 12 Times

    Power LED blinks 12 Times Does the voltage on pin 33 of PA2 (Cathode of D7546) on the PA board go high? Replace the D board Is there 10V on pin1 and 24Von pin5 of PA10 on the PA board? Replace the PA board Replace the PF...

  • Page 71: Sos Troubleshooting (Th-42Px20U)

    SOS Troubleshooting (TH-42PX20U) TH-42PX20U-P Shutdown Number of Times the Power LED Blinks SOS2 (TPSOS2 (L6604) on SC Board) (SC, D, and P boards) 3.3V SOS (D and P boards) 5V SOS (D board) Power Supply SOS (Pin 7 of connector P27) (P and D boards) SOS1 (Scan Driver 2) TPSOS1 (L6603) on SC Board) (SC, SU, SD, and D boards) SUS Driver (TPSOS3 on “SS”...
  • Page 73 TH-42PX20U-P Note: The numbers followed by the letter “X” within this picture indicate the number of times the “POWER” LED flashes. Figure 33 - TH-42PD20U...

  • Page 75: Troubleshooting Chart For The Th-42Px20U

    Troubleshooting chart for the TH-42PX20U Power LED blinks 2 Times Is the voltage low on TPSOS2 on the SC board? Replace the D board Is 15V present on TP15V on the SC board? Replace the P board Replace the SC board SC Board SC Board...

  • Page 76: Power Led Blinks 3 Times

    Power LED blinks 3 Times Is 12V present on pin 1 of connector P25 on the “P” board? Is 5V present on Replace the D pin 5 of board connector P25 on “P” Board? Replace the P board P Board D &...

  • Page 77: Power Led Blinks 4 Times

    Power LED blinks 4 Times Since, this board is located underneath the PA board, it is very difficult to get to the test point while the TV is on. Replace the D board. Normally this condition is triggered when the 5V line is loaded down on the D board D board...

  • Page 78: Power Led Blinks 5 Times

    Power LED blinks 5 Times Does the voltage at pin 7 of connector P27 go low? Replace the Replace the “P” “D” board board P board P board D & PA board...

  • Page 79: Power Led Blinks 7 Times

    Power LED blinks 7 Times Is the red LED (D6583) on the SC board lit? Does the Replace the “D” Board voltage at TPSOS1 go low? Replace the SC board. Check voltage at TPSOS1 using a Note: Both, the SU and the SD boards peak-hold meter.

  • Page 80: Power Led Blinks 9 Times

    Power LED blinks 9 Times Is the red LED on the SS board lit? Does the Replace the “D” Board voltage at TPSOS3 go low? Replace the SS board SS board SS board...

  • Page 81: Power Led Blinks 12 Times

    Power LED blinks 12 Times Does the voltage on TPB7516 (Cathode of D7546) on the PA board go high? Replace the D board Is there 10V on pin1 and 24V on pin5 of PA10 on the PA board? Replace the PA board Replace the PF board...

  • Page 82: Power Led Blinks 13 Times

    Power LED blinks 13 Times Does the voltage at pin 6 of connector P27 on the “P” board go low? Replace fan. (Unplug Replace the P30~P33 one at a “D” board time to determine which fan is defective) Fan SOS (P board) P board P30~P33 (P board)

  • Page 83: Th-42Px25U-P Protection Circuits

    TH-42PX25U-P Protection Circuits Protection circuits are incorporated in the unit to prevent the failure of a single circuit or a component from creating catastrophic damage. A shutdown condition occurs when a there is an over voltage, a short, or a drop in any of the voltage lines.
  • Page 84 Power LED blinking timing chart for the TH-42PX25U-P Number of Times the Power LED Blinks SOS2 (TPSOS2 (L6604) on SC Board) 3.3V SOS 5V SOS Power Supply SOS (Pin 7 of connector P27) SOS1 (Scan Driver 2) TPSOS1 (L6603) on SC Board) SUS Driver (TPSOS3 on “SS”...

  • Page 85: Th-42Px25U Pa Board Sos Detect

    TH-42PX25U PA board SOS detect Note: This circuit is identical to the circuit used on the TH-42PX25U-P model Transistor Q7541 on the PA board monitors the UNR24V, the UNR10V, and the +9V, If any of these supply lines develop a short circuit, transistor Q7541 goes into conduction and applies a high to pin 69 of the MPU, IC001, through pin 33 of connector PA2 on the PA board.

  • Page 86: Th-42Px25U 3.3V Sos Detect

    TH-42PX25U 3.3V SOS detect Pin 2 of the Microprocessor IC9709 on the D board, monitors the 1.8V_S, the 1.8V, and the 3.3V generated on the D board. It also monitors the P12V (Unregulated. 14V) generated on the P board. The 12V(Unregulated. 14V) from the P board is connected to pin 1 and pin 2 of connector D25.
  • Page 87 IC9709 Figure 36 - TH-42PX25U 3.3V_SOS_5V_SOS detect...

  • Page 88: Th-42Px25U Sc And Ss Sos Detect

    TH-42PX25U SC and SS SOS Detect The Scan and Sustain voltages on the SC and SS boards are monitored in a similar manner. The +15V Line on the SS board is fed to a voltage divider and the result is compared to a reference voltage. The reference voltage is provided by a zener diode.
  • Page 89 Figure 38 - SS-SOS Detect...

  • Page 91: Th-42Xvs30 Protection Circuits

    TH-42XVS30 Protection Circuits Protection circuits are incorporated in the unit to prevent the failure of a single circuit or a component from creating catastrophic damage. A shutdown condition occurs when a there is an over voltage, a short or a drop in any of the voltage lines.
  • Page 92 When an abnormality has occurred, the unit protection circuit operates and the TV is reset to the stand-by mode. At this time, the defective block can be identified by the number of blinks of the POWER LED on the front of the unit. The following table identifies the areas where a problem is suspected according to the number of times that the POWER LED blinks.

  • Page 93: Th-42Xvs30 3.3V Sos Detect Circuit (D Board)

    TH-42XVS30 3.3V SOS Detect circuit (D board) Pin 96 of the Microprocessor IC9300 on the D board monitors the 1.5V1, the 1.5V2, and the 3.3V generated on the D board. It also monitors the P12V generated on the P board. The 12V from the P board is connected to pin 1 and pin 2 of connector D25.
  • Page 94 Figure 40 - 3.3V SOS and 5V SOS Detect Circuit (TH-42XVS30)

  • Page 96: Th-42Xvs30 Sc And Ss Sos Detect

    TH-42XVS30 SC and SS SOS Detect The Scan and Sustain voltages on the SC and SS boards are monitored in a similar manner. The +15V Line on the SS board is fed to a voltage divider and the result is compared to a reference voltage. The reference voltage is provided by a zener diode.
  • Page 97 Figure 42 - SC SOS Detect Circuit (TH-42XVS30)

  • Page 98: Th-42Xvs30 Tuner Sos Detect

    TH-42XVS30 Tuner SOS Detect The SOS detect line from the tuner receiver comes into the TV through the tuner cable connected to the tuner-in connector on the DR board. If there is short circuit on this line, Q8200 goes out of conduction providing a high on pin 10 of the expander I/O IC (IC3004) on the J board.

  • Page 99: Th-42Xvs30 Power Sos Detect

    TH-42XVS30 Power SOS Detect Pin 94 of the Microprocessor IC9003, monitors the Vsus, the DC12Vand the 5V lines. A short circuit on any of these lines is detected by the transistors Q509, Q424, Q508, or Q511. If there is a short circuit on the DC12V line or the 5V line, Q508 turns on grounding pin 20 of IC501, making pin 15 go high.
  • Page 101 Figure 44 - Power SOS and Fan SOS Detect Circuit (TH-42XVS30)
  • Page 103 TH-42XVS30 Figure 45...

  • Page 105: Troubleshooting Chart For The Th-42Xvs30

    Troubleshooting chart for the TH-42XVS30 Power LED blinks 2 Times Is the voltage low on TPSOS2 (L604) on the SC board? Replace the D board Is 15V present on TP15V on the SC board? Replace the P board Replace the SC board SC board SC board...

  • Page 106: Power Led Blinks 3 Times

    Power LED blinks 3 Times Is 12V present on pin 1 of connector P25 on the “P” board? Is 5V present Replace the D on pin 5 of board connector P25 on the “P” board? Replace the P board P board D and Z boards P board...

  • Page 107: Power Led Blinks 4 Times

    Power LED blinks 4 Times Is 5V present on pin 5 of connector P25 on the “P” board? Replace the P Replace the D board board P board D and Z boards P board...

  • Page 108: Power Led Blinks 5 Times

    Power LED blinks 5 Times Does the voltage at pin 7 of connector P27 go high? Replace the Replace the “P” “D” board board P board P board D and Z boards...

  • Page 109: Power Led Blinks 7 Times

    Power LED blinks 7 Times Is the red LED on the SC board lit? Replace the “D” Board Does the voltage at TPSOS1 (L604) go low? Replace the SC board. Note: Both, the SU and the SD boards may load down the SC board. Isolate them before replacing the SC board.

  • Page 110: Power Led Blinks 9 Times

    Power LED blinks 9 Times Is the red LED on the SS board lit? Does the Replace the “D” Board voltage at TPSOS3 (L116) go low? Replace the SS board SS board SS board...

  • Page 111: Power Led Blinks 12 Times

    Power LED blinks 12 Times Disconnect the Tuner Receiver and see if the problem persists. The problem is in Is there 15V on the Receiver pins 5 and 6 of connector PF10 on the PF board? Replace the J board Replace the PF board J board...

  • Page 113: Service Notes

    After replacing the DG board, if some adjustments are necessary, refer to the service manual. Note: Replacement of the new DG/Tuner block assembly requires Panasonic Hotline authorization. Call 1-800-743-2335 for authorization. The defective (original) DG board (which was removed) must be returned for recycling and DUD value credit.

  • Page 114: Th-37Pa20U Th-42Pa20U (Service Bulletin # Sb-B19-04-01)

    TH-37PA20U TH-42PA20U (Service Bulletin # SB-B19-04- IC551 Failure Due to internal defect of IC551, the unit could intermittently shut down or go into stand-by mode. When this happens, the power LED blinks 5 or 7 times. Often times cycling the power off and on.

  • Page 115: Th-37Pd25U, Th-37Px25U, Th-42Pd25U, Th-42Px25U, And Th50Px25U

    TH-37PD25U, TH-37PX25U, TH-42PD25U, TH-42PX25U, and TH50PX25U Heat Transfer Pads for Models Number: TH-37PD25U, TH- 37PX25U, TH-42PD25U, TH-42PX25U, and TH50PX25U When swapping boards in the Plasma Display Television models listed above, it is absolutely essential that the Heat Transfer Pads (Soft gray spongy material) be transferred to the replacement board.

  • Page 116: Corrupted Eeprom Data In The 480I Addressing Area For Models Number: Th-37Pd25U, Th-37Px25U, Th-42Pd25U, Th-42Px25U, And Th-50Px25U (Service Bulletin Sb-B19-04-12)

    Corrupted EEPROM data in the 480i addressing area for Models Number: TH-37PD25U, TH-37PX25U, TH-42PD25U, TH-42PX25U, and TH-50PX25U (Service Bulletin SB-B19-04- The following symptoms are caused by corrupted EEPROM data in the 480i addressing area 1. Image appears split with a portion repeated on the right 1/3 of the screen on 480i/tuner/composite sources only.
  • Page 117 THIS EEPROM DATA UPDATE regardless of the original failure or customer complaint. If this EEPROM update does not resolve the listed symptoms, a replacement DG board may be needed. Call Panasonic’s Tech Support line at 1-800-743-2335 for assistance and/or a board authorization #.

  • Page 119: Th-37Px25U, Th-42Px25U, Th-50Px25U

    TH-37PX25U, TH-42PX25U, TH-50PX25U Remedy to reduce the rattle noise from speaker. A small sponge is been used in order to minimize the noise from the woofer. These sponges are available through the Tech Support Hotline. TH-42XVS30 (onyx) Information about the speakers When connecting the speakers to the TV, be sure to use only the optional accessory speakers.

  • Page 120: Alignment Procedures

    Alignment Procedures Pedestal Setting Equipment required: RF Video Gray Scale Generator Panel Settings; Picture = Normal, White Balance = Cool, Aspect Ratio = 16:9 Figure 51 - Pattern Display tep 1- Access the R, G and B cutoff settings and set them to “80”. Step 2- Under the Chroma Control setting, Set Gun off to "5"...

  • Page 121: Ntsc White Balance Adjustment

    NTSC White Balance Adjustment Equipment required: NTSC Pattern Generator, Colorimeter Panel Settings; Picture = Standard, Color Temperature = Cool, Aspect Ratio = 16:9 Step 1 - Using the Pattern generator; apply a 20 IRE Window pattern signal to the panel. Apply the color sensor to the panel and monitor the values.

  • Page 122: Hd Panel White Balance Adjustment

    HD Panel White Balance Adjustment Equipment required: 720p/1080i Pattern Generator, Colorimeter Panel Settings; Picture = Standard, Color Temperature = Cool, Aspect Ratio = 16:9 Step 1 - Using the Pattern generator; apply a 20 IRE Window pattern signal to the panel. Apply the color sensor to the panel and monitor the values.

  • Page 123: Sub Brightness Setting

    Sub Brightness Setting Equipment required: NTSC grayscale pattern Generator Figure 56 - Pattern Display Panel Settings; Picture = Normal, Aspect Ratio = 16:9 Note: Adjust in a Dark room. Step 1 - Set the white balance to Cool. Step 2 - Access the All cutoff setting in service mode and adjust it so that pixel emission starts in the 2% area and there is no emission in the 0% area.

  • Page 124: Hotel Mode Operation

    Hotel Mode Operation Hotel Mode restricts certain operation functions for use in hotels Entry to Hotel Mode 1. Enter the Service Mode using the method described previously. Note: Leave the set tuned to cable channel 124, changing the channel may inhibit access to the Hotel Mode EEPROM address.
  • Page 125 7. Press and hold the Volume Down button of the receiver and press the TV/Video button of the remote control three times within two seconds to display the Hotel Setup menu. Figure 58 Hotel Mode Setup Item Function Options The receiver automatically OFF /TV /COMP1 /COMP2 /DIGITAL INITIAL INPUT selects this input each time...
  • Page 126 Note: To return the unit to normal operation, use steps 1 through 5 to change the data at EEPROM address 1584 to 00, the Hotel mode is now disabled. All normal user functions are restored.
  • Page 127 Service Contact Information Panasonic Customer 1-800-211-7262 Call Center PTV and Digital Products 1-800-743-2335 (Authorized Service Centers only) All Other Products Tech Support Hotline 1-800-572-2672 Authorized Service Centers only (access code required) Fax 1-800-348-7315 1-201-392-4207 Non–authorized (limited time access) 1-800-833-9626 Parts Dept.

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