Panasonic TX-P42GT20B - Stuck Stby

[benjamin.d.bird]

Hi and to start with please forgive my ignorance.

TV is giving a 10 flash fault code.

Any help would be greatly appreciated.

Thanks for your time.

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

Hi and to start with please forgive my ignorance.

TV is giving a 10 flash fault code.

Any help would be greatly appreciated.

Thanks for your time.

possibly shorted SC board, check across SC2 for short or check if Q661 is shorted, it's on a heatsink of 2 transistors,

[ReeceyBurger123]

Re: Panasonic TX-P42GT20B - Stuck Stby

Tnpa5105

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

tnpa5105

tnpa5081

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

tnpa5081

Am i missing something?

also att is service manual

[ReeceyBurger123]

Re: Panasonic TX-P42GT20B - Stuck Stby

tnpa5081

Similar design similar meltdown

[dick_barton]

Re: Panasonic TX-P42GT20B - Stuck Stby

Am i missing something?

also att is service manual

Do a Forum search on those numbers given for more information.

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

possibly shorted SC board, check across SC2 for short or check if Q661 is shorted, it's on a heatsink of 2 transistors,

thanks for the reply.
can i just ask where i check them and what i am looking for?
i have a DMM and a disassembled tv ready & eager to learn!
Hungry for knowledge

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

thanks for the reply.
can i just ask where i check them and what i am looking for?
i have a DMM and a disassembled tv ready & eager to learn!
Hungry for knowledge

you have the manuals but SC2 is the 2 pin power connector Vsus enters from the P board. Q661 is the location number of a RJP63F3A or could be F4A in the manual it will be Q16661.

In majority of cases it will be shorted if the board has failed, test it and see.

[ReeceyBurger123]

Re: Panasonic TX-P42GT20B - Stuck Stby

Do some research then you will find out.

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

Do some research then you will find out.

funny you should mention that, not intending to overwhelm your cranium my friend but that is exactly what i am doing!

@tw2005
During initial start up before the led starts the 10 count, i temporary get led on SS board, none on SC board.
should i SC remove board before i check for shorts?

[martino]

Re: Panasonic TX-P42GT20B - Stuck Stby

TV unplugged from the wall,take your DMM and put on low ohm scale (where it beeps when you touch leads). Just measure between the 3 legs of Q661,it's located left lower quarter on a heatsink. If it measures shorted between the legs then remove the board.
Then make sure you sit down,have enough coffee and/or guinness/smokes with you,phone your family/friends that you will be AFK for awhile and to not worry. THEN read this:
https://www.badcaps.net/forum/showth...light=tnpa5081

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

funny you should mention that, not intending to overwhelm your cranium my friend but that is exactly what i am doing!

@tw2005
During initial start up before the led starts the 10 count, i temporary get led on SS board, none on SC board.
should i SC remove board before i check for shorts?

yeah or do it insitu. If the onboard LED does not momentarily illuminate at all sounding shorted, somewhat logical I'd think.

Unplug SC2 and check resistance or for short and q661 willbe lower left heatsink with the TV viewed from the back right way up.

My Avatar would be indicative of this board , LOL.

or remove the board. If you turned it on with the sc removed and it changed from 10 blink, that also may indicate SC. Search TNPA5081 , should be a fair bit of historic info around. Two most common codes for bad SC for this model would be 4 & 10 blink.

[ReeceyBurger123]

Re: Panasonic TX-P42GT20B - Stuck Stby

Don't call me friend. Follow TW2005's advise hes the pro on these Im out.

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

ok on SC2 no movement on 200 ohm,
on Q661 get 0.14 on one leg and 15.6 on other
not that i have any idea what this means lol

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

ok on SC2 no movement on 200 ohm,
on Q661 get 0.14 on one leg and 15.6 on other
not that i have any idea what this means lol

neither do I. Sounds like a cheap meter not digital auto ranging.

What meter is it? Does it have a diode check or continuity check beeper or buzzer? Just probe two legs on that Q661 see if it beeps constantly. 0.14 ohms is a short But since you don't understand the meter fully makes it hard for me to say with confidence.

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

You are absolutely right it is a cheap meter,

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

It doesn't have a buzzer but it does check for continuity, the display changes across all 3 legs. Which it does if I touch the 2 probes together so I assume means that there is continuity same applies to SC2

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

You are absolutely right it is a cheap meter,

Sorry mate but yuck. Good for maybe a little tinkering on a car.

stick it on diode mode , touch the probes together and note the reading then probe the legs on that Q661, have someone take photos of the reading but I'm not going to waste too much time figuring that meter out . I find they are good at confusing everyone.

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

Touching the probes together reads 001
Probes on middle and lower leg reads 014
Probes on middle and upper leg reads 001
Probes on upper and lower legs reads 014