Samsung s42ax-xb01

[Mako]

Re: Samsung s42ax-xb01

im trying i cant get it to focus, 5.2 megapixels yeah right.

[tom66]

Re: Samsung s42ax-xb01

Lets try it another way.

Unplug the connector on the Y-Main or X-Main side, leave it connected to PSU.

Probe on the available ends as you have been previously.

[Mako]

Re: Samsung s42ax-xb01

pay no attention to the diagonal down right line i drew by mistake, the little circle is the tiny node that says Vs next to it, and it looks like its been tested before, maybe a little burnt?

[tom66]

Re: Samsung s42ax-xb01

That should be fine. Looks like a test point to me.

[Mako]

Re: Samsung s42ax-xb01

when i put black on a screw slot, and red on the node, i get between 173-175. but when i only put the red one on, the reading are tiny tiny tiny, like less than .1 volts. also the tv is sitting there on, i dont think it would be powered on with less than a tenth of a volt running through it right?

[tom66]

Re: Samsung s42ax-xb01

Black on chassis, red on test point. 173V is good.

[Mako]

Re: Samsung s42ax-xb01

yes it was black on the screw, red on test point that i circled in pic. when i tried leaving the cord attached to psu, and putting the probes in the end of the cord that should be attached to y board, i got 0.000.

[tom66]

Re: Samsung s42ax-xb01

The black should be on the back of the plasma screen, like in one of the screw holes. Are you seeing 173V, or "close to zero" (<0.1V)?

[Mako]

Re: Samsung s42ax-xb01

173-174.5, when the y board isnt plugged in. let me go test something ill be back in a few.

[tom66]

Re: Samsung s42ax-xb01

So that's good, the plasma panel voltage sticker will tell you exactly what it should be (near NTSC/PAL and Samsung SDI sticker)

But since it collapses with one board plugged in the problem is with that particular board.

[Mako]

Re: Samsung s42ax-xb01

Ok, Y sus unplugged, tv stays on for a bit. when its on, i get 173-174.5 V to the psu board. 70 volts to both the left and right top buffers. 0.1~V on the X board. when Y is plugged in, tv stays on for mayve one second. so it seems like the Y and X are both gone.

[tom66]

Re: Samsung s42ax-xb01

It would seem so. I'm guessing it's the same situation with X-main disconnected?
So how did you get that purple picture as described a few posts back?

[Mako]

Re: Samsung s42ax-xb01

not really a picture, when both are connected, in a dark room, the screen lights up with a blotchy effect, mostly on top. really only the blotches light up, but only for a second or two. let me try with x disconnected, and y connected.

[Mako]

Re: Samsung s42ax-xb01

ok so with only y connected, and with both connected, same result; tv will only stay on for a moment, impossible to check voltages. so, since the buffer board is getting correct voltage while turned, on, so is the psu, those are in working order. the x and y boards, no matter what i do, have little to no voltage at any given time, means they are no good. all i should need, theoretically, are the x and y boards, correct?

[tom66]

Re: Samsung s42ax-xb01

However, please note that on some Samsung TVs it is possible for a failed Y-Main to kill the Y-Buffer. Now this is an older chassis: I do not know if this suffers from the particular flaw, but I know many Samsung plasma TVs do.