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Ursprünglicher Beitrag von: Ronald Koppers ,

Text:

Hi, I have a similar problem with 3 different boards:

* 2 ea 820-00292 Imac 5K 2015 boards
* 1 Imac 21.5” 3.0Ghz GPU-555 2017 board

All 3 have no LED at all.

Checked voltage from PSU and it’s 12V OK

Tried 3 different PSU’s and all the same, and the PSU’s work with a normal board. SO ruled out PSU.

Checked voltage on first LED and 0.5V.

So some short in the trickle power circuit?

Any suggestions appreciated.

Am a newby on board level repairs but am interested to learn.

Thanks,

Ron

Status:

open