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No magsafe light at all. Tried known good dc-in boards, no light on any. Put dc board on other known good logic boards, and THEY get light. Just this logic board has problem written all over it I think.
I think I need to work thorugh the start sequence step by step. At some point it decides to restart. THAT is the bit where things are not right. The fact it does restart is wroing as you say. But it is odd that it restarts just the once then runs at 620ma. Before the restart it is around 350ma.
I've got a 2017 MBA which the customer brought in after installing Big Sur (I think they did an upgrade). They reported that after the install completed the MacBook wouldn't boot at all. If I try and start the MacBook the fan will spin for about 4 seconds then stop and restart again. I've check...
Did I say something out of line or to offend you? Early in this thread you mentioned that BIOS files are available to download from this forum. I cannot find them. Someone else in another thread said the same thing, so not just me. I simply asked you POLITELY if you could point me to where they might be. You chose to repond with an odd reaction. Please tell me what you think I said wrong?
Yes, I read your post again and it seems I misread it. My apologies.
I have read other posts and have now downloaded your two Bios dumps, thanks.
I am however no nearer solving this other than that the magsafe light is working again. The board however, will stay at around 559ma all day after doing its strange restart. This is the part I do not understand as it is not meant to restart at all.
I agree. Oddly, that was my train of thought yesterday also. I have a conundrum though, Should I reball this one, or take a big gamble on an identical SMC (same board exactly) from a donor that had severe liquid damage. I think I will reball this one as I know at least this one DID work. I will update later today.