I just got a used Dell 2405FPW monitor with a problem. It likes to lock up whenever it's signal changes (e.g. a reboot). By lock up, I mean, go black, with the backlight on and the buttons, including power, become un-responsive. If I un-plug the power, and plug it back in, it works great. If it hasn't locked up, I can turn it off and on again with the power button. It's connected to the PC via DVI.
Suspecting bad caps, and needing to fix the power button, I opened it up. Visually, it looks very clean with no obvious problems. I took out the power supply board and tested most of the caps. Nothing was obviously amiss.
All the caps in this monitor except one are "bad" brands so I expect trouble eventually.
I'd like to test the power coming out of the board, but I'm not sure what I'm looking for. I've got a DSO, so I could see how clean the power is if I knew where to look.
Anyone have any ideas?
Suspecting bad caps, and needing to fix the power button, I opened it up. Visually, it looks very clean with no obvious problems. I took out the power supply board and tested most of the caps. Nothing was obviously amiss.
All the caps in this monitor except one are "bad" brands so I expect trouble eventually.
I'd like to test the power coming out of the board, but I'm not sure what I'm looking for. I've got a DSO, so I could see how clean the power is if I knew where to look.
Anyone have any ideas?
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