Technical Guide Plasma Training Course GP6DU, GPH6DU, and GPH7D (Onyx) Chassis Troubleshooting Panasonic Services Company National Training
Prepared by César Perdomo & Jean Magloire Panasonic Services Company National Training "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.
Table of Contents Introduction .........................................................................................................1 Model Line Up .....................................................................................................3 New Features and Circuit Improvements .........................................................5 Boards Layout.....................................................................................................9 TH-42PD25U Boards Layout (GP6DU)............
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............................................................................................
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..........................................................................
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. Furnish troubleshooting procedures that contribute to a speedy repair of the product.
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Model Line Up TH-37PD25U 37-inch 480p Version 2 Component Video Inputs 3 Composite Video Inputs 3 S-Video Inputs 1 HDMI / HDCP input 1 Tuner _NTSC/ATSC/QAM (SDTV and HDTV broadcasts) (Cable CARD Ready) 1 Tuner_ NTSC (Standard analog broadcasts for PIP) PC / SD Card Inputs Integrated Speaker System Surround Sound TH-42PD25U 42-inch EDTV Version 2 Component Video Inputs 3 Composite Video Inputs 3 S-Video Inputs 1 HDMI / HDCP input 1 Tuner _NTSC/ATSC/QAM (SDTV and HDTV broadcasts) (Cable CARD Ready) 1 Tuner_
TH-42XVS30UP 42-inch HD Version (720p via PC input only) Digital Multimedia Receiver 2 Component Video Inputs 3 Composite Video Inputs 3 S-Video Inputs 1 HDMI / HDCP input 1 Tuner _NTSC/ATSC/QAM (SDTV and HDTV broadcasts) (Cable CARD Ready) 1 Tuner_ NTSC (Standard analog broadcasts for PIP) PC / SD Card Inputs Integrated Speaker System Surround Sound TH-50XVS30UP 50-inch HD Version (720p via PC input only) Digital Multimedia Receiver 2 Component Video Inputs 3 Composite Video Inputs 3 S-Video Inputs 1 HDMI
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 • PC Input (VGA/SVGA/XGA/UXGA) • Digital Audio Out • On/Off Timers • SD Card Slot with Photo Viewer • HDMI Input • 2 Tuners (PIP with Split Screen) Handle ATSC/QAM/Cable-CARD tuning, source A/V switching and SD/PC Card connectivity • Approximately 21 feet cable con
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 • Circuit employs countermeasures to maximize image quality • Image will be smoother and more natural with all sources.
Models Comparison Tables Model Chassis Native Resolution (Number of pixels) TH-50PX25U/P TH-42PX25U/P TH-37PX25U/P GPH6DU GPH6DU GPH6DU 1366x768 1024x768 1024x720 Cable CARD Ready1 cable service without the box Yes Yes Yes TH-42PD25U/P TH-37PD25U/P GP6DU GP6DU 852x480 852x480 TH-42XVS30 TH-50XVS30 TH-65XVS30 TH-50PHW7BX Shades of Gradation Contrast Ratio 1536 1536 1536 Up to 3000:1 Up to 3000:1 Up to 3000:1 Yes Yes 1536 1536 Up to 4000:1 Up to 4000:1 GPH7D Onyx GPH7D Onyx GPH7D Onyx 102
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Boards Layout TH-42PD25U Boards Layout (GP6DU) Figure 1 - TH-42PD25U boards layout TH-42PX25U Boards Layout (GPH6DU) Figure 2 - TH-42PX25U boards layout 9
TH-50PX25U Boards Layout (GPH6DU) Figure 3 - TH-50PX25U boards layout TH-42XVS30 (Onyx) Boards Layout (GPH7D) Figure 4 - TH-42XVS30 Board Layout 10
TH-50XVS30 (Onyx) Boards Layout (GPH7D) Figure 5 - TH50XVS30 Board Layout TH-65XVS30 (Onyx) Boards Layout (GPH7D) Figure 6 - TH65XVS30 Board Layout 11
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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. An additional NTSC sub-tuner provides a video output signal (no audio) for use with multi-picture functions. The composite output of the main tuner is connected to the NTSC input switch IC on the H Board.
Figure 7 - Video Block Diagram 14
Figure 8 - H Board Block Diagram 15
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Figure 9 - H Board Block Diagram 17
Figure 10 - DG Board Block Diagram 18
GPH6DU Chassis HDMI Signal Process Figure 11 - HDMI Signal Process The HDMI (High Definition Multimedia Interface) input is a port designed to receive digital video and audio from a set-top box, a DVD player, or other digital devices. IC5003 of the DV board converts the digital video to parallel analog Y, Pb, and Pr video signals. The signals are output from IC5003 to a set of video amplifiers. After amplification, the signals are applied to the A-Board via pins 14, 16, and 18 of the connector DV7/DG51.
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. The digital video output of IC6013 is then converted to analog by IC6015 and output to the DG-Board via the connector JG3/DG31.
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” or RGB signals output by IC3005 are amplified by IC3101 and applied to the Dboard via pins 4, 8, and 12 of the connector J1/D1.
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. The signals from IC8003 are applied to IC8005 for wave shaping and inversion.
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. Video signals, from the receiver box, are also applied via the connector CN3301, which resembles a DVI connector, and then to IC3304 for decoding into analog RGB.
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.
Onyx RGB/Sync Analog to Digital Conversion Figure 16 - D Board RGB to Analog Conversion The 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 is output to IC9501. The purpose and operation of IC9501 are discussed in a later section of this manual. Sync Processing The horizontal and vertical sync signals enter the D-Board via pins 16 and 18 of the connector J1/DG1.
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. Adjustments such as white balance, contrast, color, and brightness are also corrected here.
GPH7D (Onyx) Tuner Receiver Onyx models have separate Tuner Receivers. This receiver connects to the monitor using two 21” cables combined in one harness (P/N K1V245L20001). Figure 18 - Connecting Cables All input and output connections are located on the receiver.
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 • SD Card (512MB) • Mini SD Card (128MB) • Multi Media Card (128MB) • Compact Flash (1GB) • Smart Media (128MB) • Memory Stick (128MB) • XD Picture Card (128MB) • Flash ATA (128 MB) • Memory Stick Pro (1GB) Note: The cards require standard PCMCIA card adapter.
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. This voltage is applied to the 5V regulator circuit (Q552 and Q537) to generate the standby 5V. The standby 5V is applied to the microprocessors on the D-board (IC9701 and IC9709).
The microprocessor (IC9709) on the D-board sends a “High” on its pin 45 to the PBoard 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. This circuit supplies 5V, 12V, 15V, and the Vda voltage. It also supplies 21V. This voltage is applied the15V regulator, IC550.
Figure 23 - TH-42PD25U Power on operation 31
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How to troubleshoot a “no power condition for the TH-42PD25U Is the power LED red at power up? Yes No Does the voltage at pin 2 of P27 go high when power is turned on? Yes No The P board is possibly defective Is the voltage high at pin 9 of PF10 on the PF board? Yes No The D or the DG board may be defective Is there 10V on pin 1, and 24V on pin 5 of connector PF10 on the PF board? Yes No 3 7 11 17 21 25 5V 5V 5V 10V 9V 2.
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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. This voltage is applied to the 5V regulator circuit (Q552 and Q537) to generate the standby 5V.
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DG6 DG3 Figure 24 - TH-42PX25U Power on operation 37
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. This turns on the relay RL901. Via the relay, AC is applied to the bridge rectifier D920.
Figure 25 - TH-42PX25U-P Power on operation 39
How to troubleshoot a “no power condition for the TH-42PX25U Is the power LED red at power up? Yes No Does the voltage at pin 2 of P27 go high when power is turned on? Yes No The P board is possibly defective Is the voltage high at pin 9 of PF10 on the PF board? Yes No The D or the DG board may be defective Is there 10V on pin 1, and 24V on pin 5 of connector PF10 on the PF board? Yes No 3 7 11 17 21 25 5V 5V 5V 10V 9V 2.
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 TV. 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” on the upper right hand corner of the screen. Also, the power LED turns blue.
“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. The power supply for the SC-Board is controlled by the same control lines as the power supply for the SS –Board, via the connector PC701/P700. This allows both Power supplies to run in tandem.
4 1 Figure 26 - TH-65XVS30 Power On operation 43
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? No Yes Does pin 11 of P700 of the SS Power board go high? Does pin 2 of P27 of the P board SS go high? No Yes Does pin 20 of P700 of the SS Power board go high? No Yes Can 12V be measured on pin 10 of connector P12 when turning the power on? Check the PC board Yes Check the SS Power board, and the SC Power board Check the SS Power board, and the SC Power board Ye
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. Also, shutdown occurs when any of the fans draw more current than normal.
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.
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. This triggers the SOS circuit. Transistor Q7544 monitors the +5V, and +2.5V line. If any of these supply lines increase in voltage transistor Q7544 goes into conduction causing its collector to go low.
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Figure 28 - TH-42PD25U PA board SOS detect 49
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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. This effectively grounds pin 3 of the CPU IC9709 on the D board, triggering the shutdown circuit.
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. The reference voltage is provided by a zener diode. If the output of the comparator goes high, a transistor turns on, effectively grounding the SOS line. The SC board uses a similar circuit.
Figure 31 - SS board SOS Detect 53
Power LED blinking timing chart for the TH-42PD25U-P Number of Times the Power LED Blinks 1 - 2 SOS2 (pin 12 SC20 on SC Board) 3 3.
TH-42PD25U-P Note: The numbers followed by the letter “X” within this picture indicate the number of times the “POWER” LED flashes.
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Troubleshooting chart for the TH-42PD25U Power LED blinks 2 Times Is the voltage low at pin12 of connector SC20 on the SC board? Yes Is 15V present on TP15V on the SC board? No N Replace the D board No Replace the P board Yes Replace the SC board SC Board SC Board SC Board 57
Power LED blinks 3 Times Is 12V present on pin 1 of connector P25 on the “P” board? No Replace the D board Yes Replace the P board Yes Are5V present on pin 5 of connector P25 on the “P” No P Board D & PA Boards P Board 58
Power LED blinks 4 Times No Is 5V present on pin 5 of connector P25 on the “P” board? Replace the P board Yes Replace the D board P Board D & PA Boards P Board 59
Power LED blinks 5 Times No Does the voltage at pin 7 of connector P27 go low? Replace the “D” board Yes Replace the “P” board P Board P board D & PA board 60
Power LED blinks 7 Times Is the red LED (D6583) on the SC board lit? No Does the voltage at pin 11 of SC20 go low? Yes Replace the “D” Board No Yes 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. SC board Check voltage at pin11 of SC20 using a peak-hold meter.
Power LED blinks 9 Times No Is the red LED on the SS board lit? Does the voltage at pin9 of SS23 (L719) go low? Yes No Replace the “D” Board Replace the SS board Yes SS board SS board 62
Power LED blinks 12 Times Does the voltage on pin 33 of PA2 (Cathode of D7546) on the PA board go high? No Replace the D board Yes Is there 10V on pin1 and 24Von pin5 of PA10 on the PA board? Yes No Replace the PA board Replace the PF board PA board PA board 63
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SOS Troubleshooting (TH-42PX20U) TH-42PX20U-P Shutdown Number of Times the Power LED Blinks 1 - 2 SOS2 (TPSOS2 (L6604) on SC Board) (SC, D, and P boards) 3 3.
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TH-42PX20U-P Note: The numbers followed by the letter “X” within this picture indicate the number of times the “POWER” LED flashes.
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Troubleshooting chart for the TH-42PX20U Power LED blinks 2 Times Is the voltage low on TPSOS2 on the SC board? Yes Is 15V present on TP15V on the SC board? No Replace the D board No Replace the P board Yes Replace the SC board SC Board SC Board SC Board P Board 69
Power LED blinks 3 Times Is 12V present on pin 1 of connector P25 on the “P” board? No Replace the D board Yes Replace the P board Yes Is 5V present on pin 5 of connector P25 on “P” Board? No P Board D & PA Boards P Board 70
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.
Power LED blinks 5 Times No Does the voltage at pin 7 of connector P27 go low? Replace the “D” board Yes Replace the “P” board P board P board D & PA board 72
Power LED blinks 7 Times Is the red LED (D6583) on the SC board lit? No Does the voltage at TPSOS1 go low? Yes Replace the “D” Board No Yes 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. Check voltage at TPSOS1 using a peak-hold meter.
Power LED blinks 9 Times Is the red LED on the SS board lit? No Does the voltage at TPSOS3 go low? Yes Replace the “D” Board No Replace the SS board Yes SS board SS board 74
Power LED blinks 12 Times No Replace the D board Does the voltage on TPB7516 (Cathode of D7546) on the PA board go high? Yes Is there 10V on pin1 and 24V on pin5 of PA10 on the PA board? Yes No Replace the PA board Replace the PF board PA board 75
Power LED blinks 13 Times No Does the voltage at pin 6 of connector P27 on the “P” board go low? Replace the “D” board Yes Replace fan.
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. Also, when the fans are drawing more current than normal the shutdown circuit is triggered. The microprocessor IC9709 detects when a shutdown condition has been triggered.
Power LED blinking timing chart for the TH-42PX25U-P Number of Times the Power LED Blinks 1 - 2 SOS2 (TPSOS2 (L6604) on SC Board) 3 3.
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. This triggers the SOS circuit. Transistor Q7544 monitors the +5V, and +2.5V line.
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. If the voltage in any of these lines drops, the SOS circuit is triggered.
IC9709 Figure 36 - TH-42PX25U 3.
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. If the output of the comparator goes high, a transistor turns on, effectively grounding the SOS line. The SC board uses a similar circuit.
Figure 38 - SS-SOS Detect 83
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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. Also, when the fans are drawing more current than normal the shutdown circuit is triggered. The microprocessor IC9003 detects when a shutdown condition has been triggered.
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. Power LED blinking timing chart for the TH-42XVS30 Number of Times the Power LED Blinks 1 - 2 SOS2 (TPSOS2 (L6604) on SC Board) 3 3.
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. If the voltage in any of these lines drops, the SOS circuit is triggered.
Figure 40 - 3.
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. If the output of the comparator goes high, a transistor turns on, effectively grounding the SOS line. The SC board uses a similar circuit.
Figure 42 - SC SOS Detect Circuit (TH-42XVS30) 91
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. This change of voltage on pin 10 is reported to the main microprocessor IC (IC9003) on the D board through the SCL3 and the SDA3 bus line.
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.
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Figure 44 - Power SOS and Fan SOS Detect Circuit (TH-42XVS30) 95
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TH-42XVS30 4X 5X 7X 2X 12X Figure 45 97 3X 9X
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Troubleshooting chart for the TH-42XVS30 Power LED blinks 2 Times Is the voltage low on TPSOS2 (L604) on the SC board? Yes Is 15V present on TP15V on the SC board? No Replace the D board No Replace the P board Yes Replace the SC board SC board SC board SC board 99
Power LED blinks 3 Times No Is 12V present on pin 1 of connector P25 on the “P” board? Replace the D board Yes Is 5V present on pin 5 of connector P25 on the “P” board? Yes Replace the P board No P board D and Z boards P board 100
Power LED blinks 4 Times No Is 5V present on pin 5 of connector P25 on the “P” board? Replace the P board Yes Replace the D board P board D and Z boards P board 101
Power LED blinks 5 Times No Does the voltage at pin 7 of connector P27 go high? Yes Replace the “D” board Replace the “P” board P board P board D and Z boards 102
Power LED blinks 7 Times Is the red LED on the SC board lit? No Does the voltage at TPSOS1 (L604) go low? Yes Yes Replace the “D” Board No 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. Check voltage at TPSOS1 using a peak-hold meter.
Power LED blinks 9 Times No Does the voltage at TPSOS3 (L116) go low? Is the red LED on the SS board lit? No Yes Replace the “D” Board Replace the SS board Yes SS board SS board 104
Power LED blinks 12 Times Disconnect the Tuner Receiver and see if the problem persists.
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Service Notes TH-37PA20U TH-42PA20U (Service Hint SH-B19-04-06) If the DG board is defective, order a complete tuner block assembly (it contains DG board, H board, Tuners and wire harnesses Part #: TXAUX01QCSU), instead of just ordering the DG board. The new replacement DG board has a larger 6-pin connector at DG18 and is incompatible with the original DG board, which had a small connector. A running change to the DG board production was made.
TH-37PA20U TH-42PA20U (Service Bulletin # SB-B19-0401) 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. To correct this problem, replace IC551 with an improved IC as indicated on the Service Bulletin number SB-B19-04-01.
TH-37PD25U, TH-37PX25U, TH-42PD25U, TH-42PX25U, and TH50PX25U Heat Transfer Pads for Models Number: TH-37PD25U, TH37PX25U, 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. These pads are mounted on certain ICs located on the boards. They are used as replacement for the traditional metal heat sinks used for heat dispersion.
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-B19-0412) 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 1/3rd of the screen on 480i/tuner/composite sources only. Using 1080i HD sources, the picture is ok. 2.
For all units requiring service, if the serial number is below YB4550001, APPLY 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 #.
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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. There are no replacement parts available for the speakers at all.
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 Step 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" (Only green pixels emitting).
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. Step 2 - Adjust the Sub Bright Setting to 10 cd/m2. Step 3 - Set the G Cutoff Setting Value to 80. Step 4 - Adjust the Red and Blue Cutoff settings to match the values in Table 10.
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. Step 2 - Adjust the Sub Bright Setting to 10 cd/m2. Step 3 - Set the G Cutoff Setting Value to 80. Step 4 - Adjust the Red and Blue Cutoff settings to match the values in Table 11.
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. Step 3 - Write down all cut off data. Step 4 - Set the white balance settings to Normal.
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. 2. Press the Power button on the remote control to display the service menu. Figure 57 - Service Man Menu 3. Press and hold the MUTE button on the remote control for a few seconds.
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 INITIAL INPUT INITIAL VOL LEVEL MAXIMUM VOL LEVEL INITIAL CH BUTTON LOCK REMOCON LOCK Function The receiver automatically selects this input each time power is switched on. The receiver automatically selects this volume level each time power is switched on.
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.
Service Contact Information Panasonic Customer Call Center Tech Support Hotline Other Numbers 1-800-211-7262 PTV and Digital Products 1-800-743-2335 (Authorized Service Centers only) All Other Products 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.
