Panasonic TX-P42GT20B - Stuck Stby

[tn245]

Re: Panasonic TX-P42GT20B - Stuck Stby

In my case I know the P and SC boards are good because I have had them running in another set. Also with D5/A31 disconnected it is turning on with full white screen. As soon as D5/A31 reconnected I get 10 blinks.

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

Same can't seem to get off 10 blinks

doing my head in. you may have a double fault, does happen and I have had a bad SC damage the A board to have 10 blinks but the D is in between both.

If this was the regular 2D I 'd be more sure. Try that 10 blink steps with the multimeter and let us know.
Unfortunately I'll be getting some ZZZZZZs shortly, been a big day.

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

Same can't seem to get off 10 blinks

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

Have not seen led on SC light up at all.

yeah that's great. what do you get for error blink with sc20 and sc2 disconnected.?

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

Have not seen led on SC light up at all.

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

Tried above steps, no led on SC or SS, with p6 and p7 disconnected, no white screen with p6 p7 and d5 disconnected.
The only way I can get led on SS to stay lit is to disconnect sc2.
Does this suggest power board

Would suggest SC2 is shorted but why 10 blinks? did you disconnect SC20 ribbon and SC2 power?

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

To completely disable the A board:
1. Unplug the TV.
2. Remove connectors P6 and P7 from the power supply. (See note on previous slide.)
3. Plug in the TV (Do not press the power button).
• The TV partially turns on by itself.
• The screen stays black.
• No fan operation.
• The LEDs on the SS board and SC board are on.
To force the TV to display a white screen:
1. Unplug the TV.
2. With P6 and P7 disconnected, disconnect D5 from the from the D/A board.
3. Plug in the TV.
4. Now the TV turns on by itself with a white screen.

Tried above steps, no led on SC or SS, with p6 and p7 disconnected, no white screen with p6 p7 and d5 disconnected.
The only way I can get led on SS to stay lit is to disconnect sc2.
Does this suggest power board

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

Maybe digest this if you have not.

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

Watching with interest. I've got the same A board doing 10 blinks even while SC and/or D board disconnected from it. I may follow along on mine with troubleshooting if nobody minds.

well I'm getting rusty and lazy. Just spent all day trying to get a damn broken glow plug out of an i30.

Being a 3D model, it's not one I'm exactly ace on either. 10 blink SC board pops to mind but not if it's doing it isolated. Pretty sure there's a test you can do isolating the A board, TV turns on with either a dim screen or white screen.

If you can get it to do that Then A board would be high on th elist.

It's possible to have the “Panel Drive Section” running with the “Signal Processing Section” (A board)
disconnected.
By separating the 2 sections, it could be determined if the symptom on the TV is created by the A
board or one of the boards on the Panel Drive Section.
Note: Disconnecting D3/A32 and D5/A31 allows the TV to turn on by itself with a white screen after
it is plugged in to the AC line. This procedure does not disable the A board.
To completely disable the A board:
1. Unplug the TV.
2. Remove connectors P6 and P7 from the power supply. (See note on previous slide.)
3. Plug in the TV (Do not press the power button).
• The TV partially turns on by itself.
• The screen stays black.
• No fan operation.
• The LEDs on the SS board and SC board are on.
To force the TV to display a white screen:
1. Unplug the TV.
2. With P6 and P7 disconnected, disconnect D5 from the from the D/A board.
3. Plug in the TV.
4. Now the TV turns on by itself with a white screen.

[tn245]

Re: Panasonic TX-P42GT20B - Stuck Stby

Watching with interest. I've got the same A board doing 10 blinks even while SC and/or D board disconnected from it. I may follow along on mine with troubleshooting if nobody minds.

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

Yes it has a D Board - TNPA5299

[tw2005]

Re: Panasonic TX-P42GT20B - Stuck Stby

Still gives 10 blinks with SC removed

Ok ,

Well we better not jump to any conclusions then.

Can we get an image of the back or a list of boards? Is there a D board?

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

Still gives 10 blinks with SC removed

[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

[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

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

[benjamin.d.bird]

Re: Panasonic TX-P42GT20B - Stuck Stby

You are absolutely right it is a cheap meter,

[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

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

[ReeceyBurger123]

Re: Panasonic TX-P42GT20B - Stuck Stby

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