Samsung 32" ln32b360c5d

[Peale]

Picked this up from Freecycle. Owner stated that it wouldn't turn on.

She was /kinda/ right. It comes up, the Samsung chime plays, you get a perfect picture for a second...then it shuts off. It repeats this three times.

I haven't had the opportunity to hook up a video source to it (the picture to which I referred was the on-screen menu) but I'm betting that it's continuing to operate. I found instances of people on the 'net who have had the same issue, but no mention of the fix.

None of the caps on the power supply are bulging (though I'm sure I'll replace them, anyway).

Photos, forthcoming.

[Peale]

Re: Samsung 32" ln32b360c5d

Here are the photos. I had to take two photos of each side of the power supply, since it's so large.

I hadn't taken off the logic board before now, and I'm noting what appears to be something that spilled on it. I could be wrong.

[TimT]

Re: Samsung 32" ln32b360c5d

[QUOTE=Peale;297126]

I haven't had the opportunity to hook up a video source to it (the picture to which I referred was the on-screen menu) but I'm betting that it's continuing to operate. QUOTE]

are you saying that when the screen is blank your thinking the menu screen is still working? but cant be seen because the backlight is out?

[Peale]

Re: Samsung 32" ln32b360c5d

I haven't had the opportunity to hook up a video source to it (the picture to which I referred was the on-screen menu) but I'm betting that it's continuing to operate.

are you saying that when the screen is blank your thinking the menu screen is still working? but cant be seen because the backlight is out?

Exactly.

And, when you power it off, it makes the Samsung power off chime, also.

[budm]

Re: Samsung 32" ln32b360c5d

If I remember this chassis, some one in this forum found shorted diode in the power supply/inverter board, you may want to check those black diode with the silver band, set the meter to Ohm mode 200 Ohm range.
I will search the forum to see find that thread.
What is the P/N of this power supply/Inverter board? BN-XXXXXX, tom66 may have the diagram for it.

[Peale]

Re: Samsung 32" ln32b360c5d

It's a HV32HD_9DY, rev 1.4

[Peale]

Re: Samsung 32" ln32b360c5d

Oh, BN number - BN44-00289A

[budm]

Re: Samsung 32" ln32b360c5d

Look like we are working on the same board in this thread.
https://www.badcaps.net/forum/showth...196#post297196

[budm]

Re: Samsung 32" ln32b360c5d

You may want to read and check those parts also:
https://www.badcaps.net/forum/showth...ht=ln32b360c5d

[Peale]

Re: Samsung 32" ln32b360c5d

All of the diodes on the power supply board appear to check out.

[budm]

Re: Samsung 32" ln32b360c5d

OK. we should check the High voltage winding resistance of the transformers next.
We need to find the pin out of the inverter transformers.

[Peale]

Re: Samsung 32" ln32b360c5d

How do I find that out?

[Peale]

Re: Samsung 32" ln32b360c5d

I think I missed a diode from before - ZDI802.

In circuit, the diode has a junction drop of .095, both ways. I had to get out my Fluke to double check, but it seems to be reading as shorted.

So...now to source a replacement.

edit: anyone have the schematic so I can get a part number?

[Peale]

Re: Samsung 32" ln32b360c5d

It's reading fine out of circuit. I think I was getting a false bad reading from RI812 and RI813.

[tom66]

Re: Samsung 32" ln32b360c5d

Schematic of PSU:
http://www.tgohome.com/ServiceManual...&Search=Submit

[budm]

Re: Samsung 32" ln32b360c5d

So far I cannot find the pin out of this transformer yet:
QGAH02107 TMB9

[tom66]

Re: Samsung 32" ln32b360c5d

It's on the schematic, but QGAH02110 instead, should be essentially the same part if the board is the same.

Also have 289B, if that helps.
http://www.tgohome.com/ServiceManual...&Search=Submit

[Peale]

Re: Samsung 32" ln32b360c5d

Maybe I'm doing it wrong, but don't seem to be getting a reading out of any of the windings.

Which can't be, since it comes up, briefly, when you turn it on, right?

[tom66]

Re: Samsung 32" ln32b360c5d

How are you checking the windings?

[Peale]

Re: Samsung 32" ln32b360c5d

Multimeter. Set to "2000" Ohms. Tried quite a few different pin combinations, didn't get any readings. So, I'm doing it wrong.