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Huh. I have a Dell monitor that suddenly started showing these kind of smeared stripes instead of a proper picture. Took it apart, looked carefully at all the c
by grishka 5y ago
Huh. I have a Dell monitor that suddenly started showing these kind of smeared stripes instead of a proper picture. Took it apart, looked carefully at all the capacitors and other components on both boards, but none looked bad. Disconnecting and reconnecting the ribbon that goes to the LCD panel made no difference whatsoever. What could it possibly be?
- fouc 5y agodoes a bad capacitor always show damage visibly?
- MisterTea 5y agoMost likely it will simply NOT power on. That or briefly power on and shut off once the ripple spikes and glitches everything. In another post here I mentioned fixing Optiquest monitors. The usual issue was you would press the power button and the power LED would flah for a second and... nothing. This is because the output cap of the switching supply would cease to filter the high speed square wave that goes through the transformer. So your DC power supply is now an AC square wave supply. Of course logic circuits don't like that so they will outright fail. Sometimes there is enough capacitance via decoupling caps, ground planes on the PCB and local filter caps on the logic board so the initial power up works but once the load increases the ripple increases until it becomes AC again and everything goes haywire or shuts down.
- hellbannedguy 5y agono
- ska 5y agono. but often does.
- BBC-vs-neolibs 5y agoCapacitors can be bad but look perfectly fine. If there aren't many, one can just replace all of them.
- kasabali 5y agoIf there are vertical lines most likely Cof or T-Con board failure. Unfortunately it isn't an easy repair. (Although some YouTube videos show you can work around some minor cof failures by isolating broken lines with a tape)
- BatFastard 5y agoInterestingly I have 5 Dell monitors, and 10 Samsungs that are 15 years old. Dells are all still running strong. While the Samsungs have needed replacement Caps, and their DVI ports have flaked out. I did find that if I use the VGA port they will work well though, strange...