|I have an eMachines 21.5" LCD monitor, model E211H. It's about 3 yrs old & I've had no problems with it until now. I noticed some slight flickering last night just before I shut the system down, today it won't come on. Actually, it flashes the display for about a second & that's it. Everytime it's switched off/on, the display flashes. I figured it was one or more of the capacitors, so I split the case & removed the circuit board. Unfortunately, there is no obvious swelling or leakage from any of the caps. I don't have a caps tester but I do have a decent multimeter. My question is about how to properly test them & whether or not I'm doing it correctly.|
1. discharge the cap by shorting it with a jumper wire
2. using the ohmmeter (I have it set to 20K), touch the black lead to the cap's ground & red lead to cap's positive
As I understand it, if the cap is good, the meter should immediately drop to near 0 when the leads are connected, then count up to infinity as it becomes charged by the multimeter's battery, is that correct? That appears to be what's happening with all but 2 caps. They are both 2.2uf 50v. When I touch the leads to them, the meter does nothing. There are 2 other 2.2uf 50v caps that count up to infinity like all the rest.
Does it sound like I found the bad ones? I'm not an electronics wiz so if I'm doing it wrong, please let me know. I'm pretty good with a soldering iron though so assuming I tested correctly, I'm thinking it would make sense to replace the all 4 caps of that size even though 2 tested good, just to be safe.
Thanks for your help.