wrbailey
New member
I have a 2011 820-2936-B board which had liquid damage.
Cleaned the board and I now receive green light (and amber when battery present) but no fan.
The heat sink gets hot.
I've tested all rails. Only ones I am missing are the PP0V75_S0_DDRVTT (Measures 0.005 V)
PP1V05_S0 (0.67V)
The CPU is getting warm and I have the 5V S0 rail going to the fan.
So if I am correct, the computer is turning on, but is missing some S0 rails??
I checked the rest of the S0 rails and it is just those two I am missing.
For the PP0V75_S0_DDRVTT I checked U7300 and I have the 5V S3 and 1.5V S3 going into the chip.
I also have DDRREG_EN measuring about 3.3V, however I have 0V at MEMVTT_EN at pin 17 (which is noted as VTT_EN in small print next to PIN)
When I jump over to what creates MEMVTT_EN I have PM_SLP_S3_L and it measures 3.27V and I have 4.97V at MEMVTT_EN_L and R3210 measure 9.97kohms.
Am i running in circles here trying to figure out the PP0V75 or should I be trying to figure out 1.05V S0 instead? Or would fixing the PP0V75 help fix the 1.05 as 0.75V is higher up on the voltage rail list?
Thanks for any help!!
Cleaned the board and I now receive green light (and amber when battery present) but no fan.
The heat sink gets hot.
I've tested all rails. Only ones I am missing are the PP0V75_S0_DDRVTT (Measures 0.005 V)
PP1V05_S0 (0.67V)
The CPU is getting warm and I have the 5V S0 rail going to the fan.
So if I am correct, the computer is turning on, but is missing some S0 rails??
I checked the rest of the S0 rails and it is just those two I am missing.
For the PP0V75_S0_DDRVTT I checked U7300 and I have the 5V S3 and 1.5V S3 going into the chip.
I also have DDRREG_EN measuring about 3.3V, however I have 0V at MEMVTT_EN at pin 17 (which is noted as VTT_EN in small print next to PIN)
When I jump over to what creates MEMVTT_EN I have PM_SLP_S3_L and it measures 3.27V and I have 4.97V at MEMVTT_EN_L and R3210 measure 9.97kohms.
Am i running in circles here trying to figure out the PP0V75 or should I be trying to figure out 1.05V S0 instead? Or would fixing the PP0V75 help fix the 1.05 as 0.75V is higher up on the voltage rail list?
Thanks for any help!!