Hello, I have a MacBook board that I am stuck on.
This is a 820-3437-B board which I know the standard turn on procedure is 3 fan spins before powering up and staying on, however this board the fan turns on for about 10 seconds, turns off, then turns on and stays on until powered off.
This board did appear to have some liquid near U1900 (clock chip) which I have replaced as well as the crystal just to make sure.
I get all voltage rails, vCore stable at about 1.7v, very little heat coming from the CPU/PCH (mostly PCH), with a USB with a bootable system the light flashes indicating the PCH should be working.
However it is failing to boot through as well as the strange starting behaviour.
Odd things I have found are U3900 (camera processor) was heating up quite a bit so was taken off the board, should be able to boot without it, just missing camera functions, signal PCH_INTVRMEN is 2.6v and PCH_INTRUDER_L is 1.6v.
I am unsure where to go from here so asking for advice, thanks.
This is a 820-3437-B board which I know the standard turn on procedure is 3 fan spins before powering up and staying on, however this board the fan turns on for about 10 seconds, turns off, then turns on and stays on until powered off.
This board did appear to have some liquid near U1900 (clock chip) which I have replaced as well as the crystal just to make sure.
I get all voltage rails, vCore stable at about 1.7v, very little heat coming from the CPU/PCH (mostly PCH), with a USB with a bootable system the light flashes indicating the PCH should be working.
However it is failing to boot through as well as the strange starting behaviour.
Odd things I have found are U3900 (camera processor) was heating up quite a bit so was taken off the board, should be able to boot without it, just missing camera functions, signal PCH_INTVRMEN is 2.6v and PCH_INTRUDER_L is 1.6v.
I am unsure where to go from here so asking for advice, thanks.
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