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Old 01-01-2015, 07:11 AM   #1
CapLeaker
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Default Sony Phat PlayStation PS2 power supply repair

Just had a Sony PlayStation PS2 in with a symptom of not powering up. The problem was not the ribbon cable this time, it was the internal power supply.
Delta ADP-75EP. Plugged it in, no 12V coming out. Nothing physically wrong, fuse, bridge rectifier, transistors and diodes checked all OK. Capacitor C3 (35V 33uF) checked good with the DMM, but not with the ESR meter. Replaced C3 with a 50V 100uf Nichicon PW series. Since IC2 (the white optocoupler P421f) was on the same line than the C3 I just replaced, I took it out, measured it and she was open all around. So I replaced IC2 with an NEC 2561 optocoupler that I stole out of a junked ATX power supply. Verdict: I've got a working PS2!

That is another example of not trusting the CAP setting on the DMM even if you paid 500$ for it. Always check caps with a good ESR meter.

Last edited by CapLeaker; 01-01-2015 at 07:16 AM..
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Old 07-10-2018, 06:20 PM   #2
Baddflash
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Default Re: Sony Phat PlayStation PS2 power supply repair

Thank you sir for posting this info, you have taught me a valuable lesson regarding esr meters and my lack of one.

I had found the bad opto and replaced it with the same part infact but no joy until I found this post, swapped in a 47uf 50v cap and the psu works perfectly again.
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Old 07-10-2018, 07:23 PM   #3
CapLeaker
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Default Re: Sony Phat PlayStation PS2 power supply repair

glad this worked for you too! BTW, this PlayStation is still going strong to date. I guess it has been a few years since I fixed this thing, but I remember that the cap and the opto where bad...
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