Panasonic TC-P58VT25 - "10 Blinks" problem

[checkport88]

I got a Panasonic Plasma TC-P58VT25 for free, but it is displaying the "10 blink" error, and I would love to diagnose and repair this TV.

I have seen the variety of things that might be wrong according to the service manual and from what others posted online. But I haven't been able to figure out the problem yet.

The SS board green LED is lit when I power the TV, but the LED on the SC board doesn't light up.

I have a bit of electronic experience, but not doing repairs on the component level, but I would love to learn. I have a DMM and soldering gear ready to go.

If anybody has any ideas of what the problem(s) might be, or if this has already been dealt with in another thread please let me know.

[Diah]

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

10 blinking in general at Panasonic are back light shorting or bad panel. bad caps

disassemble it and inspect it.

[Malachi]

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

It's a plasma. No back light.

[martino]

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

10 blinking in general at Panasonic are back light shorting or bad panel. bad caps

disassemble it and inspect it.

Sorry,but that doesn't even begin to make sense. If you don't know,don't reply.

[checkport88]

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

I had the SC board out last night and everything looked okay physically, although I'm not completely sure what to look for. I was wondering if it wasn't getting Vsus power at SC2.

[Alastair E]

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

Check Q661 on SC for short.

If it is, there'll be a whole lot more shorted parts on the SC board too....

[Diah]

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

Sorry,but that doesn't even begin to make sense. If you don't know,don't reply.

then let me know if you do know... i wrote in general. and this true..

[checkport88]

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

Do I need to de-solder Q661 to check for a short? I did try checking it last night, but I wasn't really sure if I was doing it properly.

[Alastair E]

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

With Panasonic--The model number gives it away.

tc 'P' 58xx-xx etc.

Where P hints to Plasma....

Samsung and LG are much the same, but the other way round, having 'L' in the number....

[Alastair E]

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

Do I need to de-solder Q661 to check for a short? I did try checking it last night, but I wasn't really sure if I was doing it properly.

Nah--Dont need to. If short--It'll be Dead-short Emitter-Collector, less than an ohm

[martino]

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

It's simple,you saying "10 blinking in general at Panasonic are back light shorting or bad panel. bad caps" might make the owner think "oh,bad panel,better just throw it away".
You can't just throw a opinion out based on nothing! Like I said,if you don't know,then don't say anything,sit back and read and learn.
Do I know? Yes I do. But there is TW2005,Alastair,Budm etc that know WAY more then me so I don't say anything.
I did however check if I have a sc board here as I live in the same province and I checked my notes to see if I repaired a TNPA5175 before.

Sry to interrupt the matter at hand,last thing I had to say about it.

[checkport88]

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

Thanks, I'll check again later. I should be using the diode setting? or resistance?

[Alastair E]

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

Resistance tests are what I use for first run diagnostics on semi-conductors like these IGBT's, usually the 200 ohm range on meter.

More exacting testing comes after. A Short will show up on resistance And on diode--But a good working diode junction will Not show up on Resistance test-IF its not shorted/faulty/leaky.

Diode test usually supplies from meter around 5V. This is enough to 'Forward-Bias' --Turn-on-- a diode--so current flows.
Diodes normally need around 0.7V to forward-bias, although some specials (shottky diodes) can bias at around 0.3V.

Resistance tests from meters usually supply 0.2V so don't turn diodes/transistors/semis on, but find proper shorts or test resistors etc--Its almost like testing parts on the circuit and ignoring all the semis on the board...

[checkport88]

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

I re-checked Q661 and confirmed that it is shorted. I checked the other transistors and diodes, it looks like there are several that are shorted.

I probed from the underside of the board on the solder points because some of the legs were difficult to access. Would this yield the same resistance values?

What direction do I need to take now? Probably check capacitors, resistors, any thing else? Replace anything that is shorted. Should I be worried about the SD and SU boards?

[gdawg]

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

I would recommend searching on Google for Panasonic tc-p58vt25 technical guide and download it.

There is all the info in the technical guide you need to trouble shoot. This is a very complex board and can be hard to repair unless you have a lot of patience. There are kits available that include the most common failed part but not always all of them.

Very important to check your buffers for shorts, cause a shorted buffer will take out all the work you did on the SC board.

Common that the SU fails.

Unless you are really good at soldering very small components, you might look into a replacement board or a repair. You dont want to attempt a repair and then send it out for repair, cause most repair shops wont touch it if it has been attempted to repair.

[checkport88]

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

Thanks for the advice. I have the technical guide and the service manual, which I will have to read through. I think that buying new boards is not really an option judging by the price and availability of them. I've been looking for something to solder anyways so I figured this would be as good as any.

[Moreno83]

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

You also need to check the buffer boards for shorts.

Check this vid :

https://www.youtube.com/watch?v=51SZsfH60EY

If they are ok then your SC board is probably the only board that is bad.

Well , you got the TV for free , with a new SC board you got a nice tv for little money!

[gdawg]

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

Great, -- its challenging and you will get a lot of practice soldering. Be patient, don't hurry through and it is really cool to fix the board. There is plenty of help on the forum-

[checkport88]

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

Awesome! I guess I know what I have to do. Thanks everybody for the help.

[gdawg]

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

You can probably put the board number in the search section of the forum and there are some real experts that have repaired that board. If you read thru the posts you will pick up some real valuable info on the repair. Good luck and you might report your progress as you go along.