Samsung C32HG70 Curved Gaming Monitor - No Power

[budm]

Re: Samsung C32HG70 Curved Gaming Monitor - No Power

Are 100% sure that all Seven rectifier diodes are all tested good?
It sounds like the power supply is in startup/shutdown mode; it can be due to bad startup/running caps (small lytics caps) on the hot side, or shorted circuits on the cold side.
Try measuring all the DC output pins (Or Cathode pin of the rectifier) against GND to see if any of them show low resistance reading or not with and without main board connected.

[DemonBG]

Re: Samsung C32HG70 Curved Gaming Monitor - No Power

Hi Budm,

I checked all of the diodes again and cant see any issues with them.

I will pull the caps now and test them and report back.

Thanks again,
Demon

[DemonBG]

Re: Samsung C32HG70 Curved Gaming Monitor - No Power

Update:

I have checked all of the diodes again as well as all of the electrolytic and Polypropylene capacitors - All of them meter ok.

So one thing i have noticed:
On the good power board, when the main board is disconnected, i get a solid 12 -13v at the test point and 400V DC at the large capacitors on the hot side

On the bad board, i still get this fluctuating 6 - 16v but only get ~160v at the capacitors.


not sure what to make of this? Maybe a short somewhere?

[DemonBG]

Re: Samsung C32HG70 Curved Gaming Monitor - No Power

Not sure if this helps at all, but ive done a little more probing and on the good board, when the board is off, i get 160V at the large capacitors on the hot side of the board which goes up to 400v when powered on.

On the bad board, the capacitors stay solid at ~160v despite the board trying to cycle to power on?

Any ideas out there?


Regards,
Demon

[DemonBG]

Re: Samsung C32HG70 Curved Gaming Monitor - No Power

So i ended up transferring the MOSFET and a bunch of other through-hole components from the second board (which was stuck trying to boot) to the board which kept blowing fuses.

The good news is that the board now powers up. The bad news is that it has an unsual problem that i have never seen before in that; whenever there is the slightest movement in the power board, it cuts out and reboots.

I suspect there is a bad connection somewhere but after an hour have not managed to find it...

Does anyone know of anything else that would manifest in this kind of behavior?

Thanks all,
Demon

[gorri56]

Re: Samsung C32HG70 Curved Gaming Monitor - No Power

I am Have this monitor, I have found that the fuse is blown. I was wanting to know if anyone knows where to get this fuse from