Panasonic Viera TP-P50S30 Funky Picture Issue

[tw2005]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

This is from a 42" 2010 HD model

Vad = -191V
Vscn = - 43.6V
Ve = 124.9

these were measured with respect to chassis gnd.

I'm not optimistic that putting a 55" board in place of a 50" would cause that issue.
I have a feeling someone has actually tried fixing a TV doing that and it worked.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Right now the correct board is no where to be found in a used or refurbished condition. I found it new at 2 places for over $400. For now I'm letting it sit in the corner in the hopes that that a board comes available. The other option is to buy a repair kit for $35.

I suppose if I had the drive I could populate the board the same as the old one, but my hands aren't steady enough due to a muscle disease.

I'll update this thread if I ever have an operable board. Thanks for all your help guys. This would have been easier with out my lack of attention to detail.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Found my board at usefulparts.com for $49.99 regular price, but sold out. Also found a new board at factoryoutletstore.com for $160, but not willing to fork out that much right now. I got to build up some liquid cash after the unexpected drain of money last month.

Also found 3 on ebay, but when the pictures show the boards sitting on bed spreads or a fake leather couch; I start worrying about ESD. They may have worked, but are now suspect.

[RJARRRPCGP]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Also found 3 on ebay, but when the pictures show the boards sitting on bed spreads or a fake leather couch; I start worrying about ESD. They may have worked, but are now suspect.

More likely, the boards will be bad because of SMD components being torn off.....

(Possibly including being dragged across a carpet.) (If it's like cards at electronic recycling facilities.)

[martino]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Only board I don't have for this set is the SC board,all other boards I do have.
I just repaired one of these(SC board was dead) and I wouldnt call this TV a POS,the picture is absolutely amazing,had a hard time giving it back to owner haha

[tw2005]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Why don't you just send yours in for repair before july 4 and get it done for $84 less 35% which would make about $55!

http://www.moduslinkptstvboards.com/txnsc1mnux/

http://moduslinkptstvboards.com/current-discounts/

Another thought, maybe contact them and see if they can test the SS too and send both together . At least you'll have a better idea of where you're at.

i read stories of people sending stuff in and if it's good, they won't touch it. Sounds like they're honest.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Why don't you just send yours in for repair before july 4 and get it done for $84 less 35% which would make about $55!

http://www.moduslinkptstvboards.com/txnsc1mnux/

http://moduslinkptstvboards.com/current-discounts/

Another thought, maybe contact them and see if they can test the SS too and send both together . At least you'll have a better idea of where you're at.

i read stories of people sending stuff in and if it's good, they won't touch it. Sounds like they're honest.

That is a good option. I'd just have to find the proper shipping material and a large enough ESD bag.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Ok, so today I did some measuring and found the following shorted:

2- RFN20NS3S

3- RF1501NS3S

1- RFN10NS3S

1- 30F131

and the following caps shorted (but not isolated from board)

C644
C643
C642
C401

All the kits I've seen list 4 transistors, 4 resistors, and 2 diodes in the kit. So, apparently my SC board is not blown like the typical kit would fix.

So do I forget the kit and just buy what I know to be shorted from a parts supplier? Problem is I don't know the cap values.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Ok, scratch that last post. After looking at the data sheets, I realized I needed to lift both leads to isolate the diodes. Turns out all are good. This is looking like bad caps. There are both mylar and electrolytic across the Vsus that are easy to pull. The hard ones are the surface mount.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Funny how being out of electronics for nearly 25 years has slowed the abilities, but come back they do...

Here's the latest. After depopulating all the mylar and electrolytic caps that were connected to the Vsus with none of them being bad; I hit pay dirt. Don't ask me why? Old age? I digress. I have now isolated the issue to 3 blown 30F131 FETs. With the leads lifted they're showing shorted, and the Vsus has gone to 1.77 Mohm.

I had originally figured on troubleshooting down to component level, but had seconds thoughts after so many years away from that level of electronics. Guess that was a mistake.

[Hombre]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Can i guess that these 3 are bad: Q401, Q402, Q422?

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Can i guess that these 3 are bad: Q401, Q402, Q422?

Q402, Q403, and Q422. Q401 is an RF1501 and it's good.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

I've got all the good parts reconnected. Vsus resistance is still good.

Now here's the question: Is there a trick to getting the 30F131s off the board, or is it just my soldering iron is too low a wattage?

[Hombre]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

If you lifted those two legs than just put iron on metal pad (collector) of igbt and add some solder, it will help it to come off faster.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

If you lifted those two legs than just put iron on metal pad (collector) of igbt and add some solder, it will help it to come off faster.

Yeah, I was being overly cautious. Definitely takes a lot of heat.

On another note; anybody have a good source for those 30F131s?

[tw2005]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Q402, Q403, and Q422. Q401 is an RF1501 and it's good.

Q401 can't be RF1501 as that is a diode. D401 would be.

I don't think there is a Q401 populated on this board.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Q401 can't be RF1501 as that is a diode. D401 would be.

I don't think there is a Q401 populated on this board.

You are correct. No Q401. I was looking at the D401 with a splash of flux on the "D".

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

I see in my search around here that several members have had good luck with parts on ebay. I just bought a pack of 10- 30F131s for $8.56 with a delivery date in 2 weeks.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

I got the transistors today. Will be installing on the board tonight. I'll let you know tomorrow what the results are.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Fired it up and immediately got the 8 blink SOS. Did the specified tests and it's the SS board. Score another one for you tw.

Fortunately, shopjimmy.con has a corner on the market for these SS boards. I can live with another $38 if the TV comes back to life.