This board ran on battery but had no green light. Found corrosion around Q5310 and that edge of the board and had .7V at SMC BC ACOK. Replaced Q5310 and got green light and PPBUS G3H and short fan spin but stops... PPBUS G3H stays steady at 12.62V once connected to power and after fan starts and stops.
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820-2936 short fan spin on charger only, runs on battery
- Thread starter grmacs
- Start date
Does it start in SMC bypass mode?
Most likely.
Check resistance between pins 17/18 and 27/28 of U7000.
Also check SMC_DCIN/PBUS_VSENSE and SMC_DCIN/BMON_ISENSE.
Check resistance between pins 17/18 and 27/28 of U7000.
Also check SMC_DCIN/PBUS_VSENSE and SMC_DCIN/BMON_ISENSE.
"BMON ISENSE 3.4V"
Too high value; post CHGR_BMON level.
Too high value; post CHGR_BMON level.
Check the circuit between CHGR_BMON and SMC_BMON _ISENSE.
Aaaah, you get short fan spin in normal mode.
Then must be a SMC sensor from other rail.
Check all other sensor circuits from pages 49/50.
I bet for some corroded trace, or resistor.
Then must be a SMC sensor from other rail.
Check all other sensor circuits from pages 49/50.
I bet for some corroded trace, or resistor.
Shouldn't be DCIN sensor, as it tries to start in normal mode.
DCIN and PBUS sensors look good also.
DCIN and PBUS sensors look good also.
lost a pad on the smc trying to reball it. DOn't have another 2936 board! I'll have to put this one on the shelf until I get a SMC for it. I was thinking it had to be SMC related being the battery op runs fine and charger sensors seem to be reading correctly? Idk. I couldn't identify any sensor issues related to the pages you referenced but I'll try again once I get SMC back on it.