Panasonic th-p42x10z

[tw2005]

Re: Panasonic th-p42x10z

Ok so I managed to test a couple of vsus points which were 187.7v before the tv shuts down again,the sticker says 187v so I'm guessing this means the power supply is working ok.
Cheers
Nick

try checking TPVAD and TPVSCN on the SC

[lambchopsnz]

Re: Panasonic th-p42x10z

Yeah I will do that again and write the result down this time.

[lambchopsnz]

Re: Panasonic th-p42x10z

ok so i did some more testing on the tv tonight and these are the results i got...
TPVSUS (SS)187V
TPVe (SS) 125V
TPSS1 (SS) 15V
VSET (SC) 190V
VAD (SC) -180V
VSCN (SC) -35V
TpVSUS (SC) 187V
TPSOS6 (SC) 5.72V
TPVDAT (P) 60V
TPVSUS (P) 187V
The Ve on the sticker is 125v and the Vsus is 187v does this mean the power supply is working ok?
cheers
Nick

[tw2005]

Re: Panasonic th-p42x10z

ok so i did some more testing on the tv tonight and these are the results i got...
TPVSUS (SS)187V
TPVe (SS) 125V
TPSS1 (SS) 15V
VSET (SC) 190V
VAD (SC) -180V
VSCN (SC) -35V
TpVSUS (SC) 187V
TPSOS6 (SC) 5.72V
TPVDAT (P) 60V
TPVSUS (P) 187V
The Ve on the sticker is 125v and the Vsus is 187v does this mean the power supply is working ok?
cheers
Nick

Puzzling, isn't it. Was Vset 190V or 290V

[lambchopsnz]

Re: Panasonic th-p42x10z

oh my mistake it was 290v

[tw2005]

Re: Panasonic th-p42x10z

oh my mistake it was 290v

even better, so for the Vscn measurement how were the probes connected?

Red to ?
Blk to ?

[lambchopsnz]

Re: Panasonic th-p42x10z

All measurments were taken with the black probe on the chassis metal and red on the test points i could find printed on the boards.

[tw2005]

Re: Panasonic th-p42x10z

TPSS1, definitely 15V ? Just going through some history 102V on a 42X20 but that's with a running panel.

[tw2005]

Re: Panasonic th-p42x10z

All measurments were taken with the black probe on the chassis metal and red on the test points i could find printed on the boards.

So all the values on the Sc are good except TPSOS6 is obviously high and tripping the A board.

Do you have the old SC board?

[lambchopsnz]

Re: Panasonic th-p42x10z

TPSS1, definitely 15V ? Just going through some history 102V on a 42X20 but that's with a running panel.

yeah im pretty sure this was 15v or close to that i can re check tomorrow. This is also the ss board i got through ebay not the original.
yes i do have the original sc board and buffers also the ss board.

[tw2005]

Re: Panasonic th-p42x10z

yeah im pretty sure this was 15v or close to that i can re check tomorrow. This is also the ss board i got through ebay not the original.
yes i do have the original sc board and buffers also the ss board.

Well it's a shit deal but it may be worth checking a few things.

Check the C2 board, the ribbons between that and the A-board (2 of) , corrosion etc.

Check the SS has all the leads connected including SS23 - C23

Try the old SS

Replace the C2 board

Don't know how much you've sunk into this but It says either c21 or c22 removed triggers SOS 6. If one of those little 20 pin buffer ICs has failed that could also produce the same effect.

Failing thtat then that leaves the A board I guess although it appears at the moment to be behaving normally.

DO NOT run the TV with any of those bottom panel ribbons with them unbolted or not heatsinked. I think the sinks are on the ribbon anyway but best to have these all bolted just in case otherwise if they heat up and burn out it's all over.

I removed a metal strip once on a Samsung not realising it was a heatsink, burnt out the lot of them, panel destroyed.

[lambchopsnz]

Re: Panasonic th-p42x10z

well i haven't spent to much on it and its been an experiment lol just harder than i expected.
I did check those ribbon cables from the c2 board and they looked perfect all the other cables are connected i will try putting the original ss board back in and re-test the voltages.
If that fails i will see if i can get a c2 board. I have been believing it was the A board most of the time and the guy i got the 3 boards was going to send me one to see if it made a difference unfortunately for me he sold his last one the other day so i will see if he has a C2 board to match and try that.
Thank you again for all your help tw2005 i really appreciate it and im glad i found this forum.
I will keep you posted with any updates.. and i hope i can find a board or an A board.
cheers
Nick

[lambchopsnz]

Re: Panasonic th-p42x10z

TPSS1, definitely 15V ? Just going through some history 102V on a 42X20 but that's with a running panel.

I changed my ss board back to the original one and retested TPSS1 i think the first test showed 120v but not 100% sure now since i retested and got 15v each time.
I also tried unplugging the white ribbon cables from the C boards to the A board and with the 2 from the C boards and the 1 from the SC board disconnected the led stays green and the tv stays on but with the 2 ribbons from the C boards connected and just the SC unplugged i get 8 blinks.
cheers
Nick

[tw2005]

Re: Panasonic th-p42x10z

I changed my ss board back to the original one and retested TPSS1 i think the first test showed 120v but not 100% sure now since i retested and got 15v each time.
I also tried unplugging the white ribbon cables from the C boards to the A board and with the 2 from the C boards and the 1 from the SC board disconnected the led stays green and the tv stays on but with the 2 ribbons from the C boards connected and just the SC unplugged i get 8 blinks.
cheers
Nick

The 15V could be normal until the panel comes on. On mine I see 15V then 95v with the panel on.

When I disconnect sc20 only I get 6 blinks. Is that what you did for your 8 blinks? Also I see 15V and for a blink it goes OL as ittrips. I would say this is when the panel is about to come on and the SOS shuts it down. The meter is too slow to give the reading as it's auto ranging at that point , hence OL.

[lambchopsnz]

Re: Panasonic th-p42x10z

Yeah I'm pretty sure it gave me 8 blinks

[tw2005]

Re: Panasonic th-p42x10z

Yeah I'm pretty sure it gave me 8 blinks

If I disconnect one of the C2 board ribbons I get 8 with sc20 disconnected as well.

Seems to point to the C board because if I disconnect just the C board ribbon I get 6 which is your original fault.

[lambchopsnz]

Re: Panasonic th-p42x10z

Yeah I was thinking that thanks for your help I'm just waiting to hear back from a guy to see if he's got a C board if he doesn't not sure what I'll do next..

[tw2005]

Re: Panasonic th-p42x10z

Yeah I was thinking that thanks for your help I'm just waiting to hear back from a guy to see if he's got a C board if he doesn't not sure what I'll do next..

there's plenty around on Ebay. Not a common board to fail.

Sometimes payless works out ok if you get stuck, postage kills it a bit

http://www.paylesscomponents.com/pan...-tnpa4893.html

May be worth considering getting both c1 and C2 if you can just in case it may be either C board

can't promise this is it but there are not many boards left to swap.

reminds me so much of my X20, absolute nightmare to fix

[lambchopsnz]

Re: Panasonic th-p42x10z

Cheers for that I did think I probably need to replace both.
Do you think there's a high chance it could be the panel instead of all these boards? I really hope not.

[tw2005]

Re: Panasonic th-p42x10z

Cheers for that I did think I probably need to replace both.
Do you think there's a high chance it could be the panel instead of all these boards? I really hope not.

Doubt it.

The worst thing about this is being wrong but you've replaced the obvious stuff with no luck, keep plodding along, all you can do.