REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday 1 March 2019

PLASMA TV TROUBLESHOOTING - PANASONIC VIERA PLASMA DISPLAY FAULT - TROUBLESHOOT FULL GUIDE

 

Plasma TV Troubleshooting - Panasonic Viera Plasma Display fault - troubleshoot 

Panasonic Plasma TV - Troubleshooting - 1
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 
* A short circuit on the voltage lines.
* Over-voltage condition.
* Abnormality in the Control Drive Pulse circuit i.e. SC, SS, SU or SD boards.
* Missing source voltage to the PA board (STB14V) from P board.
* Missing output voltage from the PA board to the DG board.
* Missing 15V or Vsus on either SS or SC board while the control drive pulses from the D board are being provided.
D Board SOS detect
DG Board SOS detect
PA Board Test Points
LED BLINKING 10 TIMES
When the power LED blinks 10 times right after the Plasma TV has been plugged in to the AC source, the possible defective boards are:
P Board
PA Board
DG Board
H Board
DT Board
How to Rule out the P Board
Use a Peak Hold Meter for voltage reading
NOTE: Follow this procedure when the click sound of the relay can be heard after the unit is plugged in. 
1. If the relay does not click, check the STB 5V from the P board. If the STB 5V is missing, the P board may be defective.  (If STB 5V is OK, the DG board may be defective.
2. Disconnect Connector P10 on the P board. (Make sure that the TV is unplugged)
3. Because you only have 2 – 3 seconds to measure the STB14V, place your meter’s probe at pin 1 of connector 10 of the P board before plugging the TV in to the AC line.
4. Plug the TV in to the AC line while still holding the probe at Pin 1.
5. Check to see if the 14V comes up. If it does not come up the P board is defective. If it does, (since it may take some involvement to determine which of the PA or DG board is defective) it is OK to order both the PA and DG board together.
To rule out H Board
1. Disconnect connector H40 then plug Plasma TV to AC line.
2. If the power LED stops blinking, the H board may be defective; otherwise another board is causing the problem.
NOTE: It is recommended that the PA board be replaced at the same time if the H board is suspected to be defective and will be replaced.
To rule out the DT (Digital Tuner) Board
1. Remove the DT board and then plug the Plasma TV into an AC source.
Note: When the DT board is removed, the unit will still power up but all functions are disabled due to the lack of data communication.
2. If the power LED stops blinking the DT may be defective otherwise, another board is causing the problem.
3. Other possible causes of blinking are the PA or DG board.
LED BLINKING 5 TIMES
This blinking code is caused by abnormalities in the 5V voltage supply line.
Other possible cause is a problem in Vda supply voltage line.
Other Cause of 5V SOS
The Power LED can also blink 5 times if the Vda voltage is shorted. This is normally
caused by the Panel demultiplexer ICs.
Procedure to properly isolate C Board
When the ribbon cables from the D board to the C boards are disconnected in order to isolate the C   boards, the LED will blink 6 times.
• To properly isolate the C boards to avoid 6 blinks, TP9387 (on the D board) should be grounded by a
1Kohm resistor.
Note: The next slide will show reasons why SOS 6 blinks is generated when the ribbon cables are removed.
• The Vda connector should also be disconnected.
Fan SOS
To determine if the fan is the cause of the 11 blinks, simply use a peak hold meter to determine if pin 3 of the fan connector goes high before shut-down.
• If it does, the fan is defective.
• If not, check the other fans and the fan drive circuitry.
No Video and No OSD
Determining whether a no video or no OSD symptom is caused by the video process or the panel drive circuit
Isolation of SC & SS Board
If any of the connectors providing the 15V or Vsus voltage to the SC or SS board is disconnected, while the connectors providing the scan and sustain drive pulses are present coming from the D board, the Plasma TV will shut-down.
Isolation of SC Board
SC2, SC23 & SC20 Disconnected:
In this condition, when the SC2 SC20 & SC23 are disconnected the SC board is completely isolated from sources (P and D board).
The power LED stays on and the panel is primed.
Expectations when isolating SC Board
The SC board could be isolated from the driver boards (SU&SD)
Sometimes the TV will go into Shut-down indicating that the problem is located on the SC Board. This does not necessarily mean that the SC board is the cause of the Problem.  When this occurs, disconnect both the SU and the SD boards from the SC board.
To disconnect, remove the 2 screws holding each of these boards in place and disconnect SC41, SU45, SD46 and SC42.
Sometimes the TV may not go into Shutdown, when there is a scan problem.  This symptom seems to be caused by a defective D or SC board.  When in reality, it is caused by the SU board.
When this occurs, disconnect the SU board from the SC board.  Disconnecting the SU board yields a good picture at the bottom half of the screen and a completely black area in the upper half of the screen.
Isolation of SU Board.
Screen-shot – defective SU
Isolation of SD Board
Click on the pictures to magnify

 Panasonic Viera Plasma Display faults - troubleshoot


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 
Common Problems
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.
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).
Symptom: Blue vertical line @ right most edge of the screen.
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.
Symptom: Distorted picture.
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.
Symptom: Dead/relay will not click & LED remains off (no blinking code).
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.
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.
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.
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.
Symptom: Very intermittently unit shutdown and LED blinks 7X.
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.
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.
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.
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.
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.
Posted By: FRANK at 06:31
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