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Forum: Troubleshooting Power Supplies and Power Supply Design

04-01-2016, 01:01 PM

Replies: 118

IMAC 24 PSU Bad Caps replacement

Views: 35,497

Posted By mkinn

Re: IMAC 24" PSU #614-0387 - Bad Caps replacement

Power supply 614-0387
When it gets hot, you have to unplug it to get it to start up again.
When cool, it always starts up and runs fine. Sometimes if I leave it on for a few days, it will shut off...

Forum: Troubleshooting Power Supplies and Power Supply Design

04-01-2016, 12:37 PM

Replies: 0

24" imac A1200 2111 - bad power supply

Views: 2,251

Posted By mkinn

24" imac A1200 2111 - bad power supply

Power supply 614-0387
When it gets hot, you have to unplug it to get it to start up again.
When cool, it always starts up and runs fine. Sometimes if I leave it on for a few days, it will shut off...

Forum: Troubleshooting Power Supplies and Power Supply Design

02-22-2016, 02:46 PM

Replies: 11

Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

Views: 6,281

Posted By mkinn

Re: Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

Complete recap, same problem.

Forum: Troubleshooting Power Supplies and Power Supply Design

02-21-2016, 11:31 PM

Replies: 11

Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

Views: 6,281

Posted By mkinn

Re: Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

33UF 35V (130°) X2 - 1.0 ohms - RX30
100uf 35V - 0.5 ohms - (PW)P
220UF 35V X2 - .25 ohms - (HD)P
820UF 25V - .25 ohms - ZLH
470UF 16V - .25 ohms - (PW)P
1000UF 16V X6 - .1 ohms - ZLH
150UF 50V...

Forum: Troubleshooting Power Supplies and Power Supply Design

02-21-2016, 09:28 PM

Replies: 11

Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

Views: 6,281

Posted By mkinn

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...

Forum: Troubleshooting Power Supplies and Power Supply Design

02-21-2016, 06:46 PM

Replies: 11

Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

Views: 6,281

Posted By mkinn

Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

Slight click when power button is pressed, HD spins up for 1/2 a second, then shuts down. Obviously, it is trying to power on, because the HD spins up for a 1/2 second. I don't suspect any shorted...

Forum: Announcements & Related News

08-17-2014, 05:21 PM

Replies: 30,117

Sticky: New Members - please post your introductions here

Views: 3,024,383

Posted By mkinn

Re: New Members - please post your introductions here

Michael Kinnaird, 43+ years audio/video bench tech for Pacific Stereo, IAV/Home Entertainment, Tweeter, Etc., and 7 years with GeekSquad. ISF certified calibrator, ISCET cert., Member I.E.E.E
I...

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