Panasonic TXP50VT30 ysus repair

[satinser]

Having difficulty getting hold of schematic diagram of the SC/Ysus board used in this receiver ( TNPA5335 ). Anybody got a copy?

[tw2005]

Re: Panasonic TXP50VT30 ysus repair



That should be a good one to use. Most of the PDFs now are no good, lucky to find this which is more detail than normal.

there's quite a few kits out there for clues too

[satinser]

Re: Panasonic TXP50VT30 ysus repair

That should be a good one to use. Most of the PDFs now are no good, lucky to find this which is more detail than normal.

there's quite a few kits out there for clues too

Appreciate your help many thanks that just what I wanted.

[satinser]

Re: Panasonic TXP50VT30 ysus repair

The SC board was s/c on SC2 caused by all the following components going s/c D421,Q403,Q402,Q401,D401,Q423,Q422 and Q421. Fitted the repair kit and also replaced Q531 and ic502 included in the kit as a precaution. Followed the correct procedure by linking SC50 and the board worked ok without SD and SU connected. Connected SD and SU boards and removed SC50 link. Everything worked fine for 15 -20 minutes then 7 blink error code started again. On checking all the above replaced components had once again gone short circuit.
Any body know the most likely cause for this to happen?

[satinser]

Re: Panasonic TXP50VT30 ysus repair

Any help or advise re above would be appreciated.

[tw2005]

Re: Panasonic TXP50VT30 ysus repair

Tough one to give much advice on. Bit like knowing why these fail in the first place.

getting 15 -20mins then same failure, makes me wonder whether a part was overheating and then failed, bad earthing screws, or substandard parts/fakes?

Any tech support from the kit provider?

Someone had a moduslink board fail fairly quick, sent it back, got it repaired again and second time round seemed ok. Forget which series, 2011/12?

Not that I'm suggesting getting another kit from the same supplier.

If the picture was fine, I would be inclined to assume the screen and buffers were ok.

Maybe ditch repairing it and see if you can score an original board instead.

[satinser]

Re: Panasonic TXP50VT30 ysus repair

Appreciate your comments. I also belief its heat related which is also I in all probability the reason why they fail in the first place. I bought the repair kit from an Ebay seller but have now ordered individual components from Charles Hyde ( trade seller) and in so doing paid about 50% less.
I belief that the dissipation of heat from the rear of the component to the solder pad on the board is the all important factor that could lead to premature failure if not soldered tight to board. I will have to pay more particular attention to this when the components arrive. I will keep you informed of the outcome.