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820-2936-B Missing PP3v3_S0 Quater fan spin

supamodz

supamodz

Member
Hi guys,

we're working on a 820-2936-B logic board that came in it has green light on the charger with quarter fan spin. Replaced U7400, ISL 6259, U2800, U7200, PP3v3_S0 has no shorts to ground and everything checks out okay. i replaced Q7830, R7830, R7832, C7830, C7831,i jumped Q7812 pin 3 and 4 to ground and received the same results. I am a bit confused on understanding on how this circuit works. when i removed Q7830 the fan spins and the board does not turn on, but i know it needs PP3V3_S0 to power most of the board. Any help would be highly appreciated. Really confused.
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duh.gif
 
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dukefawks

Administrator
By removing Q7830 you are killing S0 power good signal and the board stays on. I bet all power is OK and it is a bad clock chip or SPI problem.
 
supamodz

supamodz

Member
Hey duke, i replaced clock chip already and problem was the same. If it's an spi issue, should i replace it or just reflash it?
 
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dukefawks

Administrator
Depends on the history of the board, liquid? Dropped? Fucked up? Just swap a BIOS from a scrap board on there, verify it is not blank of course. Always keep the old!
 
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