I wanted to give an update on my first venture into testing caps on my low brightness LCD monitor (Dell E2210f).
I purchased a MESR-100 ESR Meter (
https://www.amazon.ca/gp/product/B0779D67SB). I turned on the unit, attached the alligator clips together, then pressed ZERO. I then proceeded to locate on the leads for the capacitor on the underside of the board. I placed the black and red clips as best i could onto the small nubs that were protruding from the board then tried to keep steady. I cant say the clips were clamping too well but certainly the best i could. I do not have needle tip probes to swap in. All capacitors were tested in-circuit.
My results:
** Specs represents the IMP value (20'c @ 100khz) pulled from the capacitor maker's spec sheet.
1. Su'scon SG 1201 - 470uf 25v (Specs:
.038 IMP) = ESR Test Result =.034, .037, .031, .037, .035 << from 5 diff capacitors
2. Su'scon SG 1201 - 22uf 16v (Specs:
0.8 IMP) = ESR Result = .09, .09, .09 << from 3 diff capacitors
3. Su'scon HG 1205 - 100uf 16v (Specs:
.210 IMP) =
ESR Result = .036, .012 << from 2 diff capacitors
4. Jamicon TLP - 680uf 25v (Spec:
.070 IMP) =
ESR Result: .012 / .025 << from 1 capacitor, fluctuation
5. Elite PW - 100uf 450v (Spec:
UNKNOWN) ==
ESR Result: .369I'm still clueless as to the impedance rating but i assume i want to equal the value or at least be plus or minus 10% within range. Is this correct?
For the record i also have a Capacitor Tester which i have not tried as it is my understanding i must first remove the capacitors from the board before testing.
I would appreciate any advice on how to proceed with my troubleshooting.
Thanks