HD
Step Up Models: TH-50PX500 - TH-42PX500 - TH-58PX600 - TH-50PX600 - TH-42PX600
HD
Leader Models: TH-50PX50 - TH-42PX50 - TH-37PX50 - TH-58PX60 - TH-50PX60 - TH-42PX60
- TH-37PX60
SD
Leader Models: TH-42PD50 - TH-42PD60 
Symptom:
Dead/LED off (no blinking code).
Cause: Vsus (Sustain voltage) voltage line shorted to ground due tco shorted transistors.
Remedy: Replace Q6611, Q6612, Q6613, Q6613, D6609, open R6710 & R6708. After replacement, check that Vsus line is no longer shorted to ground.
Cause: Vsus (Sustain voltage) voltage line shorted to ground due tco shorted transistors.
Remedy: Replace Q6611, Q6612, Q6613, Q6613, D6609, open R6710 & R6708. After replacement, check that Vsus line is no longer shorted to ground.
Symptom:
Picture pixelized @ area horizontally across the screen.
Cause: Initialization pulse T2’s level settings is misadjusted.
Remedy: Adjust VR6557 to obtain specified level settings (T2=184 µsec).
Cause: Initialization pulse T2’s level settings is misadjusted.
Remedy: Adjust VR6557 to obtain specified level settings (T2=184 µsec).
Symptom:
Blue vertical line @ right most edge of the screen.
Cause: Missing data line.
Remedy: Open R7125
Cause: Missing data line.
Remedy: Open R7125
Symptom:
After pressing power button, unit shutdown then LED blinks 7X Cause: SOS
protection circuitry detects problem in scan output waveform Vf due to shorted
scan output transistor Q6511.
Remedy: Replace both Q6511 and Q6512 at the same time.
Remedy: Replace both Q6511 and Q6512 at the same time.
Symptom:
Distorted picture.
Cause: Missing TPVSET voltage due to open R6602 & shorted C6526
Remedy: Replace R6602 & C6526.
Cause: Missing TPVSET voltage due to open R6602 & shorted C6526
Remedy: Replace R6602 & C6526.
Symptom:
After pressing power button, unit shutdown then LED blinks 7X
Cause: SOS protection circuitry detects problem in scan output waveform Vf due to shorted scan output transistor Q6511.
Remedy: Replace both Q6511 and Q6512 at the same time.
Cause: SOS protection circuitry detects problem in scan output waveform Vf due to shorted scan output transistor Q6511.
Remedy: Replace both Q6511 and Q6512 at the same time.
Symptom:
Dead/relay will not click & LED remains off (no blinking code).
Cause: No output from power output control module.
Remedy: Replace MC701
Cause: No output from power output control module.
Remedy: Replace MC701
Symptom:
Dead/relay will not click & LED remains off (no blinking code).
Cause: No standby voltage.
Remedy: Replace IC501.
Cause: No standby voltage.
Remedy: Replace IC501.
Symptom: After pressing power button, unit shuts down then LED blinks 7X
Cause: SOS protection circuitry detects problem in scan output waveform Vf due to shorted scan output transistor Q6604 & Q6654.
Remedy: Replace Q6604 and Q6654.
Symptom:
Upon power ON, relay clicks then LED blinks 8X.
Cause: No sustain pulse output waveform due to shorted D6020 and/or D6021.
Remedy: Replace both: D6020 & D6021 at the same time.
Cause: No sustain pulse output waveform due to shorted D6020 and/or D6021.
Remedy: Replace both: D6020 & D6021 at the same time.
Symptom:
Dead/relay will not click & LED remains off (no blinking code).
Cause: No primary supply to T501 thereby no secondary voltage outputs. Due to open in-rush current limiter K601 & open RF601.
Remedy: Replace K601 & RF601.
Cause: No primary supply to T501 thereby no secondary voltage outputs. Due to open in-rush current limiter K601 & open RF601.
Remedy: Replace K601 & RF601.
Symptom:
Upon power ON, relay clicks then LED blinks 10X.
Cause: No switching voltage output from F14_ON or 12V/15V_ON pins.
Remedy: Replace power module MC501.
Cause: No switching voltage output from F14_ON or 12V/15V_ON pins.
Remedy: Replace power module MC501.
Symptom: Very intermittently unit shutdown and LED
blinks 7X.
Cause: No solder @ pin 4 of IC6773.
Remedy: Resolder pin 4 of IC6773
Cause: No solder @ pin 4 of IC6773.
Remedy: Resolder pin 4 of IC6773
Symptom:
Shuts down with power LED blinking 10x.
Cause: Missing 395Vdc output due to shorted Q412 & Q413.
Remedy: Replace Q412, Q413, Q408, Q409, R478 & PR401 on the P board.
Remedy: Replace Q412, Q413, Q408, Q409, R478 & PR401 on the P board.
Symptom:
Dead/power LED off (no blinking code).
Cause: No primary AC voltage inputs due to open fuses caused by Q406 shorting out.
Remedy: Replace F401, F402, Q406 & check/replace thermal resistor (R410) on the P board.
Cause: No primary AC voltage inputs due to open fuses caused by Q406 shorting out.
Remedy: Replace F401, F402, Q406 & check/replace thermal resistor (R410) on the P board.
Symptom:
Picture disappears after few minutes but sound is OK.
Cause: Low Ldo_5V supply to IC9800 (DC to DC Converter) due to leaky D9801.
Remedy: Replace D9801 on the D board.
Cause: Low Ldo_5V supply to IC9800 (DC to DC Converter) due to leaky D9801.
Remedy: Replace D9801 on the D board.
Symptom:
Shuts down with power LED 10 blinks.
Cause: Missing 395Vdc output due to shorted Q412 & Q413.
Remedy: Replace Q412, Q413, Q408, Q409 & PR401 on the P board.
Cause: Missing 395Vdc output due to shorted Q412 & Q413.
Remedy: Replace Q412, Q413, Q408, Q409 & PR401 on the P board.
Symptom: Dead/power LED off (no blinking code).
Cause: No primary AC voltage inputs due to open fuses caused by Q406 shorting out.
Remedy: Replace F401, F402, Q406 & check/replace thermal resistor (R410) on the P board.
Differences 2005: 50PX500/PX50 2006: 50PX600/PX60
1. The PB and Z board are now on the PA Board
2. Location of the PA and D board was changed
3. HDMI interface (DV) relocated.
4. HC board added （factory use)
Differences 2005: 42/37/PX500/PX50/PD50 2006: 42/37/PX600/PX60/PD60
1. The PB and Z board are now on the PA Board
2. Location of the PA and D board was changed
3. HDMI interface (DV) relocated.
4. HC board added （ factory use)
5. Reduce the upper C boards for single scan.
6. Reduce the S2 and S3 boards.
