Psu DELTA ADP-200DFB / Logic Board voltages on iMac Intel A1311
Good morning
I’ve an iMac 21.5 mid 2010 A1311 EMC 2389
It boots only if I connect the cable while I keep pushed the power on button
Then it starts up with fans at max speed
Then I keep pushed the power button to turn off
Then I push power button and it starts up with fans at max speed
No chimes at all
That’s the only thing I can do
Also my Logic Board doesn’t have the SMC RESET button, is this “normal” ? On web I saw some logic boards with/without SMC RESET button.
Here voltages
Is there any other test to do ?
Psu broken ? Logic Board broken ?
Here diodes checked with multimeter on PSU, D3 should be blown, about D131 I really don’t know:
D1 = 480
D2 = 470
D3 = 0
D31 = 620
D32 = 634
ZD39 = 640
ZD36 = 655
D39 = 536
D33 = 538
D131 = 560 (-) / 1665
(By the way LCD is NOT plugged and just LED 1 is ON and I have already the ATG)
http://tim.id.au/laptops/apple/imac/imac...
Best Regards
My psu Delta ADP-200DFB
Aggiorna (24/10/2020)
Good morning, I’m a new user, is site offline or there’s just a long queue to get an answer ?
Esta é uma boa pergunta?
How and why did you measure all the diodes? What values are those? Answers is not staffed by anyone. We are only volunteers on here trying to help each other out. Some questions get answers quicker because more volunteers have knowledge about it. Your question is very specific and may require lots of time to get answered.
por oldturkey03
@oldturkey03 Thanks for your message !After researches on web about my issue with iMac I did measure diodes with multimeter because they could be blown.
I could do more investigations about PSU if I would have the schematic diagram/datasheets.
At moment I wasn't lucky, I did contact also Delta at https://www.deltapsu.com/en/contact/supp...
And I did found also those sites for datasheets, maybe they can be useful for other users:
https://elektrotanya.com/showresult?what...
https://pdf.ic37.com/DELTA/brand.html
por POSEIDONE MERCEDES
POSEIDONE MERCEDES this does sound like a bad power supply. Have you checked the output voltages on it? Schematics are pretty much not available since none of these companies support the repair of their devices.
por oldturkey03
@oldturkey03 - Without this bit of info I would have agreed!
> Then it starts up with fans at max speed
> Then I keep pushed the power button to turn off
> Then I push power button and it starts up with fans at max speed
These tell me the power is getting to the logic board, so its something deeper within it. Measuring the logic board rails would be a good direction but without having schematics and board views it will be difficult.
por Dan
POSEIDONE MERCEDES your Logic Board should be a 820-2784-A Schematics and boardviews for that are readily available from the right places.
por oldturkey03
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