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820-3115-B fan spins for a split second then nothing

K

Kalemaroni

Member
This board has been in with me before. I've replaced a few bits on the charging circuitry including the U1700. Also had a lot of corrosion from water damage on the underside of the board and I had to make a couple of jumpers on PP3V42_G3H at C4903, C4908 and C4902.

It has been running fine for a few weeks apparently but now it won't turn on - the fan spins for a split second and then straight off. If I have the charger plugged in it will attempt to turn on every ~5 seconds.

I'm getting green and orange lights.

Any suggestions as to where to start would be greatly appreciated.
 
D

dukefawks

Administrator
Is CPU Vcore coming high when the fan pulses? S0 should be fine as ALL_SYS_PWRGD is needed for the fan to even come on.
 
K

Kalemaroni

Member
When you say CPU Vcore, are you referring to PPVCORE_S0_CPU? It goes up to about 0.2v on C1600 when the fan spins if that's what you mean. I'm using a Fluke 15B+ to measure that.
 
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dukefawks

Administrator
That is all fine. This could be pretty much anything. The usual suspects on these boards are crap under the SMC, dead clock chip, R7402/03.
 
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