SAMSUNG PS42D51SX bad picture

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

I Check -ok

http://www.ebay.de/itm/280922077472?...ht_2144wt_1397

I took the board from these sellers,I did correct

[tom66]

Re: SAMSUNG PS42D51SX bad picture

Since the heatsink is cold it is not working properly. You cannot be sure but the symptom is exactly like an X-main failure. I would suggest you return it for a replacement/refund...
The other possibility is a problem with the power connection going to it I suppose. Check there is Vs of 197V there too.

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

power connection is good for my regret. I might have already checked several times.

I will try to replace this board with another,but it will take a long time again. as a result I will write again

Tom Thank you for your time.

[tom66]

Re: SAMSUNG PS42D51SX bad picture

Before you order, check you have 197V, both sides of fuse.

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

Yes, there is power on both sides of the fuse

[tom66]

Re: SAMSUNG PS42D51SX bad picture

OK, I cannot be sure then at the moment. If you can borrow/have an oscilloscope you can use that to test the X-main.

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

No I do not have an oscilloscope. But I can take from my friend . I do not know how to work with it.

[tom66]

Re: SAMSUNG PS42D51SX bad picture

I can guide you through with it. Just share detailed pictures of it, as every scope is different from every other scope.

Just make sure you get a 10X probe and that it is 250V max on inputs, or more.

[tom66]

Re: SAMSUNG PS42D51SX bad picture

Re - the Panasonic (just noticed your question), I was suggesting a reflow. Look up the technique as it applies to Xbox 360s. Basically you bake the board to repair bad solder joints under the processor.

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

Ok If I take the oscilloscope I will write.

Panasonic-And through to my head that it is a bad solder on processor.

[tom66]

Re: SAMSUNG PS42D51SX bad picture

I suspect something similar to that. The A board seems to have a high failure rate on the new Panasonics...

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

Hello Tom
Only this osciloskop I can take,I hope it will be to measure

[tom66]

Re: SAMSUNG PS42D51SX bad picture

A Tek 2225 is a brilliant instrument, just remember to get a probe and check it has 400V (or more) rated inputs, I think this one does but cannot remember.

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture






This is probe

[tom66]

Re: SAMSUNG PS42D51SX bad picture

Does probe have "10X" setting?

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

yes

[tom66]

Re: SAMSUNG PS42D51SX bad picture

Then that is perfect.
Connect the probe to the "PROBE ADJUST" first and verify you can see a wave on the screen to ensure scope is functioning.

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture



work,Now what to do

[tom66]

Re: SAMSUNG PS42D51SX bad picture

OK, this particular TV has a test point XOUT on the X-MAIN board near the orange ribbons. You want to check the waveform there. Set scope to 2ms/div, line trigger, auto triggerng, 5V/div, probe to 10X (this makes scale 50V/div.)

See what waveform you see.

[Stanislav]

Re: SAMSUNG PS42D51SX bad picture

I see output XOUT, but setting the oscilloscope I need more detailed help



update

OK I saw everything but - AC or DC volts DIV

I made a picture just in case



UPDATE