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Old 02-21-2016, 09:28 PM   #3
mkinn
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Join Date: Aug 2014
City & State: Birmingham AL
My Country: USA
I'm a: Knowledge Seeker
Posts: 7
Default Re: Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

I took the power supply out.
I had to cut the heatshrink off the 2 33uf 35V caps with a sharp exacto knife.
I found the following ESR values:
33UF 35V (130) X2 - 1.0 ohms
100uf 35V - 0.5 ohms
220UF 35V X2 - .25 ohms
820UF 25V - .25 ohms
470UF 16V - .25 ohms
1000UF 16V X6 - .1 ohms
150UF 50V - .25 ohms
120uf 450V X2 - .25 ohms
All caps are RubyCon 105 caps, except the 33uf 35V ones.

Seems like they are all within spec for these caps.
Meter: Electronic Design Specialists 88A In-Circuit DCR ESR Cap Analyzer
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Michael Kinnaird 43+ years I.E.E.E A/V tech

Last edited by mkinn; 02-21-2016 at 09:32 PM..
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