Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

[Folxs]

Hi, I got burned some parts on ILPI-178, I tried to find schematic and values for that components on the board.
Can anyone help me?
Thanks!

[jondoe]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Is this the same model?

https://cdn.badcaps-static.com/pdfs/...eea2c8ca67.pdf

[jondoe]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Also

http://monitor.espec.ws/section33/topic201025.html

[Folxs]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Thank You very very much! I have ordered all the parts!

[jondoe]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Good luck! Let us know how you get on ��

[Folxs]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

It took some time, but all the parts arrived!

LD7575
R813 = 20Ohm
Q804 = AP2761i (I got installed 2763I, but in the schematic was also 2761, so I installed that)
R809 = 680Ohm
R815 = 0.47Ohm/2W
IC801 = PC817B

I checked all this part and they all were blown - they are all red on service schematic

Thanks for help!

[sam_sam_sam]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Is that photo of monitor that has the windows logo on it is that one you repaired
If so good job another one that was saved from the land fill

[Folxs]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Yes it is - i made picture to show that this is working again
Thanks!

[Behemot]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Wasn't the bulk cap bad? Usually it's because of the cap why the switching section fails.

[Folxs]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Bulk cap You mean big cap for 400V around 100uF or that small cap, that is setting frequency of inverter?

[Behemot]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

The big one on the input.

[Folxs]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

Actually both were ok
This failure was because of storm and lighting hit nearby.

[Behemot]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

IC. Can't find a varistor so it has no over-voltage input protection.

[Folxs]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

A lot of monitors have place for varistor but it is not installed

[Behemot]

Re: Burned Components on LCD Monitor Power Supply ILPI-178 ILPI 178 (Samsung 943NW)

There does not even seem to be the place for it here You may still make some with a thin drill though.