Dell U2413 turning off
I recently bought a used Dell U2413 monitor. All were working fine within my initial use, though a few days after, the monitor started to turn itself off randomly within half an hour to an hour of use-- no power led, and would turn back on after a couple of minutes. After some troubleshooting, it appears that the power supply, or something within the power supply circuit is overheating, thus causing the monitor to turn off.
I'd like to know what specific components to look into for this kind of problem?
Thank you!
edit:
Currently tinkering with the board and I'm looking at two mosfets that might be overheating. I checked with the multimeter and they're both around .450-.470v.
K15A60U (with its own heatsink)
LD7904jgp7 (no heatsink, and near the K15A60U's heatsink)
Still not sure though which one needs to be replaced.
Is this a good question?
12 Comments
Hi @dancarlocanlas ,
Have you checked the capacitors in the power supply section? Just in case they are bulging etc.
Just a thought.
by jayeff
yep. all capacitors and resistors seem to be fine -- no bulging, no burned parts, etc. I also noticed that if I provide ample air blowing at the back of the monitor, the issue doesn't persist. I do realize, this could work, but it might not be an ideal long-term solution.
by Dan Carlo Canlas
Hi @dancarlocanlas ,
Can you replace / renew the thermal paste on the heatsink that you mentioned?
Cheers.
by jayeff
That's probably my next step, though I don't have an idea about thermal paste for electronic components. I only know about them for computer cpus. Do they have specific types for each application, or any thermal paste will do? Also, I'm looking at sticking a heatsink on top of the LD7904 chip (DIP), would that be advisable?
by Dan Carlo Canlas
Hi @dancarlocanlas ,
My untrained guess is that any new paste will be better than dried old paste.
As to putting on a heatsink. It may prolong the life of the component but if it is running hotter than it should due to whatever reason then it will fail eventually anyway, but definitely worth a try.
by jayeff
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