Hello I have a plasma TV model Tc-p55gt31 that has no standby voltage . I am getting 165 dc across the main filter capacitor . I have checked all capacitor with an esr meter ,diodes , and fuses . I get various readings on the hot side but it is completely dead on the cold side . Any advice to finding the culprit would be greatly appreciated . I don't know if because I am in phone or the site update but won't let me upload pictures but will try again as soon as I get home .
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Re: Plasma TV Panasonic model number Tc-p55gt31 no standby voltage
can be more descriptive about where you're testing, symptoms etc as you plug in the TV, relay clicks etc.
So at connector A6, pin 6 is there 5V there?
Check between P15V line and earth and see if shorted or try this
Caution: Do not allow the TV to run for more than 30 seconds when isolating the power supply
The Power Supply can be tested without any load by removing several connectors from the P and A boards.
Remove the following connectors from the P board:
P2, P11, and P35.
Remove the following connectors from the A board :
A11, A12, A20, A31, A32, A14, and A40.
Procedure:
1.
Plug in the TV. The relays from the P board should click. (Note: if a second click is heard approximately 10~15 seconds after the 1st click, the F15V is confirmed to be present.)
2.
Turn the power on. (Note: The power LED should turn on and the fans should be running. If this is the case, measure the Vsus and Vda.)
Vsus can be measured on pin 1 of connector P2 or P11.
Vda can be measured on pin 1 of connector P35.
3.
If these voltages are OK, then the power supply is OK. (Note: The TV won't turn on if there is a short circuit on the P15V.)
Note: If there is a short circuit on the Vsus or Vda lines while this test is conducted;
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The SOS4_PS is not triggered. Pin 4 of connector P6 stays low. (Note: The PS SOS only monitors over-voltage conditions.
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The TV will still turn on without Vsus or Vda.
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The fans will continue to run.Last edited by tw2005; 08-13-2015, 05:23 PM. -
Re: Plasma TV Panasonic model number Tc-p55gt31 no standby voltage
Here is another method to self test a Panasonic Plasma Power Board:
1. Disconnect all the connectors to the PSU Board, except the AC input.
2. On connector P7 connect a1Kohm resistor from Pin 1 (STBY 5V) to Pin 5 (F_STBY_ON) and another 1Kohm resistor from Pin 1 to Pin 7 (Panel _Main_ON)
3. Using a piece of wire solder connect Pin 1 and Pin 3 on connector P35
4 Connect a light bulb tool across connector P2 (Vsus voltage and Gnd)
5 Plug in the AC supply, If the PSU Bd is good the light bulbs will light up.
6. Measure the Vdc across connector P2-It should give you the Vsus voltage approx. 192Vdc.
The light bulb tool is two(2) 220V 100W Light bulbs connected in series
Quick and easy method to self-test Plasma PSU Bds.
Regards.Comment
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Re: Plasma TV Panasonic model number Tc-p55gt31 no standby voltage
I read your post over and realise you don't have 5Vdc. SorryComment
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Hi,
This is my first post in attempting to keep my beloved 2013 Panasonic plasma tv going.
About 6 weeks ago the tv was turned on but then immediately shut off. There was no recent power surge or popping noise or any other symptom.
I checked all of the obvious things and decided to try a replacement power supply board (PSS in Panasonic lingo).
I would like to check the Vsus but this is one of the final models and at that point Panasonic did not indicate the Vsus and Vad voltages inside the chassis. It looks like they were discouraging people from making adjustments.... -
Hi,
anyone able to provide the service manual for old plasma Panasonic TX-P42ST50E?
It turns off almost immediately (0~5 seconds after pressing the on/off button) and starts flashing the red diode 6 times.
I disconnected the left-hand side board (SC?, both the ribbon cable and the power cable to it) and also another ribbon going to bottom left board. Then the led signal is 8 flashes. According to service guide to another Panasonic plasma it would mean the left-hand side board is faulty. But I'm not sure it 100% applies to my model.
I checked that board for any obvious faults... -
Symptom is TV has standby, I get relay click, voltage rails come up, but no screen and TV shuts down after 5 seconds. If I disconnect the Z from the y sus, the unit stays powered up and I can read voltages.
So I've read the two other threads on this TV and I can confirm the Y-Sus #EAX64789501 does not have diode or resister failure. Did not see any fractured solder joints on the transformer or anywhere else. All power boards have slight discoloration on the hot spots.
The board in question is EAX64789601, Z board. I have 208 going to Y Sus, 5v standby. Pin 5 on P174 connector... -
Hi All,
Wanting to learn some electronics repair skills.
I found a non working Panasonic TC-P60S30 and this is my first project / attempt.
So far I have found a blown cap on the main power supply board.
After replacing it there's still no standby power.
Poked around and found a resistor on the PSUB power supply board that measures open.
An online resistor calculator shows this is a 93k ohm resister.
My questions:
Is that correct, 93k ohms?
Is it a fusible resistor?
Lastly, how do I know what wattage?... -
Hello,
Stopped by this site trying to fix my parents Panasonic Plasma TV.
Model number is TH-50PZ85U
Power comes on and the red power light stays on solid.
Did a few checks like hold the power button on for 60 seconds, hold the - Volume while holding the menu button, no luck, still@ blank grey screen as the screen lights up very vague.
I also hear a few clicks.
I also think my parents said there was a thunderstorm and the TV failed after that.
Section 6 in the service manual talks about power and no screen,...10-30-2024, 10:09 AM
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