Panasonic TC-P50S2 Snowy Picture

[stj]

Re: Panasonic TC-P50S2 Snowy Picture

the snow is probably a bad cap letting ripple/noise into the processing circuits.

i'd replace all the small electrolytics - if that dont fix it, try the large ones.

[tom66]

Re: Panasonic TC-P50S2 Snowy Picture

Hence why I call it a stupid price, I really do not know how these companies sell any boards at those prices. Maybe to warranty companies only.

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

well that would not help for little more I can buy a new TV.

[tom66]

Re: Panasonic TC-P50S2 Snowy Picture

You can often buy the board through something like Sears or a parts distributor but you would be looking at a stupid price ($300+) in most cases.

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

I am going to try to call Panasonic tomorrow to see if they will sell me the board. Not sure if i will have any luck with them since i am not an "authorized repair center"

[tom66]

Re: Panasonic TC-P50S2 Snowy Picture

It's a common failure and Panasonic panels are sold in lesser numbers and are more resilient to being broken unlike Samsung panels so it's rarer to find a cracked one for parts use.

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

this board seems pretty tough to get for a TV that is less than 4 years old.

[tom66]

Re: Panasonic TC-P50S2 Snowy Picture

That will probably not fix this problem unfortunately.

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

Checked online and can only find a repair kit for that board. The kit says it is for most problems with the SC board but lists blinking fault codes which mine did not have.
could this work?

"The Panasonic TXNSC1LQUU SC Board Component Repair Kit includes all necessary components to repair common failures on the main SC board. Symptoms include will not turn on and power light will blink 4, 5 or 7 times."

Specifications: Kit Includes
Description Quantity Board Location
Transistors 8 Included With Kit
Resistors 3 Included With Kit
Diodes 1 Included With Kit
Integrated Circuits 1 Included With Kit

[martino]

Re: Panasonic TC-P50S2 Snowy Picture

I can check Monday when I'm back from dog seminar. I might have that board.

[tw2005]

Re: Panasonic TC-P50S2 Snowy Picture

I'm pretty sure the C2 is no go due to being 720p panel?
Can try some diagnosis there is a schematic, I am thinking it is the init-field FET that is not being driven correctly, best to have a scope but can see what is possible with a multimeter.

Fixed. Cheers

Should have picked that, copy/paste straight from SJ without checking they had it correct, which obviously they don't.

[tom66]

Re: Panasonic TC-P50S2 Snowy Picture

I'm pretty sure the C2 is no go due to being 720p panel?
Can try some diagnosis there is a schematic, I am thinking it is the init-field FET that is not being driven correctly, best to have a scope but can see what is possible with a multimeter.

[tw2005]

Re: Panasonic TC-P50S2 Snowy Picture

The first shot is the SC board.

The second is of the SU board bolted/connected to the SC board.

Could be a very hard board to source.

TXNSC1LQUU, TNPA5105AB



Panasonic
TC-P50S2 TC-P50U2, TX-P50S20B, TX-P50U20B

Edit: TXNSC11FEK50 is another part number.

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

There are a couple of part numbers on the board. Can you tell me which to use? Also, where can I find the prefix? I think it is a TNPA5105 but no prefix.

[martino]

Re: Panasonic TC-P50S2 Snowy Picture

Did you try and look for a cold solder joint?

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

Thank you for all of your help tom66. I will try to locate a replacement board.

[tom66]

Re: Panasonic TC-P50S2 Snowy Picture

With a modern Panasonic panel such as this, simply locating a 50" series 2 board (TC-P50G2, TC-P50V2, TC-P50S2) with the same part number and suffix should be OK. You need to avoid getting a 3D board (TC-P50VT25 comes to mind) or a 25 series board as it will likely be different. Also you can't use a 42",46",58",65" board without considerable modifications, so best to avoid those.

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

Yes the new board will probably be the best solution as my soldering skills are not the best and will be unable to obtain an oscilloscope. Do you know a good place to get a new board will be? Will there be any adjustments to make after changing the board or will simply swapping for a new one be sufficient?

[tom66]

Re: Panasonic TC-P50S2 Snowy Picture

Yes I'm aware of that, the problem is it's probably going to be down to a very small component in that circuit so locating it will be hard. You would probably require an oscilloscope.

Maybe the best bet for you is to locate a replacement board since you've narrowed the fault down to one board.

[rlhowelljr]

Re: Panasonic TC-P50S2 Snowy Picture

It is on this board. I think it is the SC. I have no idea what a VSET or INIT-F is.