I don't really know how to describe what happened to my monitor, but I made a small video here.
In summary, the output of the monitor is all garbled, but still there (not dead) – but the OSD works fine.
I have some knowledge of electronics – so I opened it up, checked the capacitors, didn't find anyone gone bad – but I'll check again, might have missed something.
Any pointers as to how could this happen, and where should I focus my investigation? I guess it's something related to the VGA input, but what could it be? (So I should check only the vga board, not the power one?)
I should note that I have another, identical monitor (it was a part of a dual-display setup): If I remove the faulty monitor and connect the good one, everything is fine – so it can't be the PC or the VGA or the cable, something has gone wrong in this particular monitor.
Best Answer
I'm guessing a bad pin - one of the syncs (either horizontal or vertical). According to pinouts.ru this could be either pin 10,12, or 13 (sync ground, horizontal or vertical sync). If you can swap cables on your monitor try that. If you can and that doesn't help, it's the connector on the monitor. You could try to replace it - aim a heat gun at the connector and pull it when all the solder melts or use a hot air rework station or a solder wick, then replace it. You can buy right angle HD-15 connectors like this one on Digikey or elsewhere. Remember - it's a high-density 15 pin D-sub connector, female, through-hole and probably right-angle. Should be cheap if that's the issue. Good luck!