Re: DGM 1931WS Monitor repair Shorted
These look like bad solder connections, have you done any component replacements?
These look like bad solder connections, have you done any component replacements?
Attached Files
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Re: DGM 1931WS Monitor repair Shorted
Yep!
Sure enough, diode 4 is conducting in both ways - that means it is shorted!
What is the part number on the diode bridge?
The NTC is also good - it looks like the bridge just has one shorted diode, and it seems the MOSFET isn't shorted, so I assume that the bridge rectifier was the only problem. It has no heatsink, and there are dust marks around it which sugguest that it gets hot. That would increase the likeliness for failure.
-BenLast edited by ben7; 10-15-2012, 02:33 PM.Muh-soggy-kneeComment
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Re: DGM 1931WS Monitor repair Shorted
I replaced the fuse and the rectifier. But the thing dosen't power at all.
I did notice that the two parts marked in the picture are shorted i don't know if that means anything or not. They are marked ground and 12v.Attached FilesComment
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Re: DGM 1931WS Monitor repair Shorted
Ok, hmm.
A few questions:
1. Did the new fuse blow?
2. Do you get about 325 volts DC on the big filter capacitor?
3. Disconnect the power board from the logic board. Do you still get a short from 12v to ground?
I am thinking that something shorted, and the PSU wasn't quick enough to shut down, which blew the fuse and rectifier.Muh-soggy-kneeComment
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Re: DGM 1931WS Monitor repair Shorted
Bump..Comment
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Re: DGM 1931WS Monitor repair Shorted
Bump..Comment
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Re: DGM 1931WS Monitor repair Shorted
"2. Do you get about 325 volts DC on the big filter capacitor? How would i test this? There is very little room for multimeter probes"
If there is space insulate the heatsink with tape and use small crocodile clips on the cap legs. Otherwise you will have to test on the back. you may not need the main board connected for this. If you still cant get at it you will have to solder wires to the joints then check those Extreme care as there could be 400 volts involved.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Normally, I never post repairs this quick after I do them, because… I am usually very slow.
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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All the caps on the top of the PCH are showing 0 ohms and the 3.3v rail is shorted.
I followed the videos from Sorin, Electronics Repair School on Youtube heating from the bottom to install. I practised on around 10 scrap... -
Hello Badcaps Community,
I purchased a preowned AOC monitor that is not working and out of warranty. It was sold as not working. I am looking for guidance on self-repair. In particular, I am after the firmware for the monitor. At the end, I have included monitor model information and links to pics and vids of the issue.
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