Electronics > Repair

Dell GX280 motherboard capacitor replacement (Rubycon MCZ alternative)

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WhichEndToHoldTheIron?:
I've made some progress on the motherboard, but with somewhat unexpected results.

All of the Panasonic FL caps (6.3v 1800uF and 6.3v 1500uF) I've removed from the board actually measure OK with the PEAK ESR70. I can't find a datasheet for this series, but all the caps were within 10% of the rated capacitance and between 0.02 and 0.03 Ohm ESR. I have replaced them with new ones though.

I removed the ultra-low ESR Rubycon MCZ caps (the ones that I was planning on replacing with poly caps), and they don't measure too bad either. All capacitances were 13% of rated (or better), with the ESR values being a bit higher than rated:

6.3V 820uF: 21mOhm ESR rated, 30mOhm ESR measured
16V 1000uF: 12mOhm ESR rated, 20 to 30mOhm ESR measured

Would the above values for the MCZ caps be enough to prevent the board from running? Feels to me like it may not be the caps that are the cause of the failure as they don't seem that bad  :-//

wraper:

--- Quote from: WhichEndToHoldTheIron? on January 27, 2025, 11:24:02 am ---Would the above values for the MCZ caps be enough to prevent the board from running?

--- End quote ---
Very unlikely.

WhichEndToHoldTheIron?:
Thanks. That was my (admittedly uneducated) thinking. Probably something else that's gone then.

Apparently the PSU is common fault area with this model; but that died years ago and I replaced it with another brand. Perhaps that one's gone too - but it'd be the first PC PSU I've ever killed  :-//

nctnico:
Be prepared to replace the capacitors again after a couple of years. This model pushes the capacitors very hard. IIRC I have one of these around as well and I recall having to replace the capacitors for a second time.

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