Panasonic TC-P58VT25 - "10 Blinks" problem

[Moreno83]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

Don't use a heatgun. My first SC board repair failed because i used a heatgun to remove the IGBT's. It worked to get them off but it probably damaged some other small components around it. After replacing the IGBT's i got a lot of purple sparkles and later on a blown SC board....

Just use a good soldering iron!

[tw2005]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

correct SC for this should be TXNSC1LZUU or TNPA5175AD.

It's a big TV so may be worth getting it rebuilt for $100 USD + ship.

http://www.ptselectronicsinc.com/txnsc1lzuu/

I would resistance check the buffers to check they're ok and proceed from there.

This is a 3D TV SC board, the cct is slightly different so you may be able to use the info for repairing a 5081 board for this to a point, I've never touched a 3D version to find out what fails on them.

[checkport88]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

I just checked the buffer boards as recommended, I was following the G20 troubleshooting guide (let me know if that was the wrong thing to do).

Results below:

On SU41:
TPSU15=467 k
TPSU16-220 k
TPSU17=658 k

On SD42:
TPSD29=470 k
TPSD28=220 k
TPSD26=653 k
Reference for all was VF_GND with screws removed.
All buffer ribbons connected.
SC board removed from TV

These resistances are not the same as the Troubleshooting Guide, but they seem somewhat reasonable. Am I to believe that the buffer boards are ok?

[checkport88]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

I am resisting the idea of sending the SC board in to get repaired. I would like to think that I can save some money and learn something by doing it myself. Although, if the replacement transistors cost too much I might consider sending the SC board in.

What else on the SC board should I be looking to replace?

[tw2005]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

I just checked the buffer boards as recommended, I was following the G20 troubleshooting guide (let me know if that was the wrong thing to do).

Results below:

On SU41:
TPSU15=467 k
TPSU16-220 k
TPSU17=658 k

On SD42:
TPSD29=470 k
TPSD28=220 k
TPSD26=653 k
Reference for all was VF_GND with screws removed.
All buffer ribbons connected.
SC board removed from TV

These resistances are not the same as the Troubleshooting Guide, but they seem somewhat reasonable. Am I to believe that the buffer boards are ok?

I'd have to question the quality of the meter and the range set but the 220k looks right and since both boards are giving the same values I'd be inclined to think they're probably ok. You need something able to read over 2 megohms but Vfo is often shorted when these buffers go.

[Moreno83]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

If you don't trust the meter then measure with continuity. No beep is ok.

[checkport88]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

I trust the meter, but it might be an operator error. Anyways, I think the buffer boards are okay.

Is there anything else I should watch for on the SC board. Should I be taking capacitors out of circuit to test them? And the diodes that are mounted on the heat sink, should I take all those out of circuit to test them? Or just test them in circuit and replace any with a short?

I already know I have to replace several transistors.

[checkport88]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

How similar is the cct in TNPA5175 to the TNPA5081? Do you think that it would be reasonable to check all of the components listed by tw2005in the "tnpa5081 rebuild" thread?

https://www.badcaps.net/forum/showth...t=26322&page=6

post #119

[tw2005]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

How similar is the cct in TNPA5175 to the TNPA5081? Do you think that it would be reasonable to check all of the components listed by tw2005in the "tnpa5081 rebuild" thread?

https://www.badcaps.net/forum/showth...t=26322&page=6

post #119

about the only board you can reference to. finding the larger items shorted is easy but watch out on the 30f125 igbts as they can fail and show 200-300ohms across the legs which is not low enough for the continuity meter to beep.

then you need to catch all smd stuff associated with q661, FET driver ic and a smd diode near that ic could be short.

good luck

[checkport88]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

Just thought I'd give you guys an update. I did attempt to replace all the shorted transistors, but it was too much of a job for me, since I am a rookie. Anyways I sent the board for repair to PTS Electronics in Indiana. A couple weeks later it came back, and I was a little bit worried that the buffer boards were going to take out the repaired SC board, so re-checked the buffer boards for shorts, and when I was satisfied, I plugged in the SC board and the TV works great! The repair cost me about $150 CAD I believe, but still not too bad for a nice big tv. Thanks for the help everyone, it's likely I'll be back on here looking for help on another TV in the future.

[tw2005]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

Just thought I'd give you guys an update. I did attempt to replace all the shorted transistors, but it was too much of a job for me, since I am a rookie. Anyways I sent the board for repair to PTS Electronics in Indiana. A couple weeks later it came back, and I was a little bit worried that the buffer boards were going to take out the repaired SC board, so re-checked the buffer boards for shorts, and when I was satisfied, I plugged in the SC board and the TV works great! The repair cost me about $150 CAD I believe, but still not too bad for a nice big tv. Thanks for the help everyone, it's likely I'll be back on here looking for help on another TV in the future.

Sweet. thanks for the feedback. We like happy endings, maybe work your self up to it. Find some boards that are toast and not bing salvaged and practice your soldering skills on them. It's the removal that need to be efficient to preserve the tracks, then cleanliness and prep. Flux and qulity desoldering braid are also handy.

[vinceroger69]

Re: Panasonic TC-P58VT25 - "10 Blinks" problem

ignore wrong thread sorry