Panasonic TC-P50S2

[bobbyd40]

Blinking red light ,10 blinks.

unplugged SS board still blinks 10 times
replugged SS and unplugged SC 7 blinks
SU and SD unplugged from Sc 10 blinks

There is a white light bulb next to where power in goes to SC board ( circled in Pic 3) does this light light up with power on ?Because it does not light even briefly when power cord plugged in or power on button pushed.

[bobbyd40]

Re: Panasonic TC-P50S2

Sorry fuses are all good none open> that bulb does show as open on DMM

[tom66]

Re: Panasonic TC-P50S2

SC is failed, check resistance between Vsus and GND on SC.

[bobbyd40]

Re: Panasonic TC-P50S2

Hi Tom, Ok i checked it at the Vsus connector with it unplugged i checked pins at the board and got 00.3 on one leg and .481 on the other leg.

[tom66]

Re: Panasonic TC-P50S2

So it looks shorted; check for shorted FETs on the board. Also try with buffers isolated.

[bobbyd40]

Re: Panasonic TC-P50S2

Ok will do and report back. thanks again

[bobbyd40]

Re: Panasonic TC-P50S2

there are 17 on the board i have tested them all once and getting very different readings on most all of them. Going to retest them all again,you mentioned to try with buffers isolated how do i do that?

[bobbyd40]

Re: Panasonic TC-P50S2

just unplug them from sc?

[tom66]

Re: Panasonic TC-P50S2

Yes, EVERYTHING unplugged from SC. They may screw in - this is power signal. Make sure that they are not touching the SC. You can leave them connected to the panel. I don't recommend removing them from the panel as it's a pain in the ass to reconnect them.

You should test from the middle pin (may be bent forwards) to each of the outer pins.

A zero or near zero (<100) reading on diode test indicates a suspect device.

[bobbyd40]

Re: Panasonic TC-P50S2

ok may be in the morning to retest had enough of this one for tonight. will reply back to you any out of range thanks again.

[bobbyd40]

Re: Panasonic TC-P50S2

Hi Tom ,Took the SC board right out for easy testing.Here are the readings i got.

1.316
.515
.962

.002
.002
.002

1.403
.334
1.124

.339
.339
.339

.339
.339
.002

.002
.002
.002

.002
.002
.002

.006
.002
.006

.007
.002
.007

.516
flashes 1.886 and then goes to OL
.602

.002
.005
.005

.012
.002
.012

.010
.002
.010

.002
.002
.002

.002
.002
.002

.385
1.358
.002

.002
.002
.002
Have posted a pic of underside of SC board with this.

[bobbyd40]

Re: Panasonic TC-P50S2

here are pics of sc board top and bottom

[tom66]

Re: Panasonic TC-P50S2

You'll need to remove each of those devices reading near zero (002, 006 etc.) and test them out of circuit.

[bobbyd40]

Re: Panasonic TC-P50S2

Ok will do. thanks

[bobbyd40]

Re: Panasonic TC-P50S2

Hey Tom have not pulled them from board yet .Did some further testing from Panasonic trouble guide and seems to be problem with the A board.I removed it to look at it and found a funny looking transistor on it. I am posting pics of it can you tell me if its normal to have a gob of solder coming out of it on both sides from the what looks like vents?Thanks

[tom66]

Re: Panasonic TC-P50S2

That is an inductor, not a transistor. It looks normal to me.

[bobbyd40]

Re: Panasonic TC-P50S2

OK thanks Still learning here and have learned a lot from this board and the great guys on it.

[tom66]

Re: Panasonic TC-P50S2

Q9004 probably refers to a nearby device or is a mistake.

[bobbyd40]

Re: Panasonic TC-P50S2

Hi Tom i have a question on a zener diode.I checked them all on psu and one on psu at z206 in pic 3 in post one reads .707 one way and 1.647 the other wouldn't that 1.647 indicate a bad diode? all the others read .707 and OL the other.
Thanks again

[tom66]

Re: Panasonic TC-P50S2

If in circuit, pull it and re-test. If it reads the same it's bad.