I used this BRD & PDF to compare to my 820-00292-A(2015 Imac 5K). Anyone has any suggestions to where to find BRD & PDF for 820-00292?
The 820-00292-A I have has a problem powering up. There are 4 LED's on the board, and the first LED(trickle power, 3V) should always be on when power is on the board. I have 12V power on the board and measured LED-1 which receives only 0.16V. I traced it back to
So it seems that Rail PP3V3_S5 receives only 0.16V.
The question is what's causing this?
There is no physical damage to the board at all.
My guess is that even though 820-3478-A is a 2013 Imac 27", the physical board is similar. The board view of the 820-3478-A for this particular circuit would hopefully be same or similar to 820-00292(a 2015 Imac).
Any help appreciated.
I'm a newby and understand I cannot start a thread yet.
I haven't seen 820-00292 schematics or boardview. 820-00291 is available, GPU area is different but the rest should be similar.
If you need help with troubleshooting, post in the "Troubleshooting Laptops, Portable, and Mobile Devices" section (not the "Schematic Requests ONLY!" subsection).
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