KC Micro Tronix
Member
820-00164 (SMC Reset "Button", Supervisor & AVREF Supply) rabbit hole from hell.
This post will show you just how little I know on these boards.
I have a 820-00164 will not get "Green Light"
H20 damage around the SMC area. I cleaned it, picked at it and reflowed any resistor that looks suspicious. Even took them off to make sure. I checked all their resistances and voltages and compared to a working board. Still no green light. So I am jumping to SMC right... Must be crud under it. I did everything possible to not mess with that chip! They eat time. So I took it off and it was perfect. No corrosion nothing. Everything was clean. Lucky for me I took it off I dragged it across a row of balls so I get to reball now.
SMC is done. looking around and measuring I notice that the SM_RESET_L is staying low. I am thinking why didn't I drop to brain mode sooner. After a few minutes of looking I get tangled around this (circuit SMC Reset "Button", Supervisor & AVREF Supply) and think it has to be something in the area. This is the only area that needed slight rework when I first started in on this board. There was a pad eaten away on R5000 and C5020. The power inputs of course. where else would water damage be.. I notice that PP3V3_S5_AVREF_SMC is 0.0V I check chip power, The PP3V3_S5_SMC & PPVIN_S5_SMCVREF are both present. Missing is the SMC_TPAD_RST_L & SMC_ONOFF_L both reading low. I decided to change the chip. U 5110 was repealed and replaced. I noticed that with the chip off the unit would green light and do a S0 bounce! I dropped on the replacement U5110 sure I had it figured out and I am the man only to discover same problem. I was looking down a rabbit hole.
Please put me on the path of righteousness and help me find my way. I am in a rabbit hole and stuck.
This post will show you just how little I know on these boards.
I have a 820-00164 will not get "Green Light"
H20 damage around the SMC area. I cleaned it, picked at it and reflowed any resistor that looks suspicious. Even took them off to make sure. I checked all their resistances and voltages and compared to a working board. Still no green light. So I am jumping to SMC right... Must be crud under it. I did everything possible to not mess with that chip! They eat time. So I took it off and it was perfect. No corrosion nothing. Everything was clean. Lucky for me I took it off I dragged it across a row of balls so I get to reball now.
SMC is done. looking around and measuring I notice that the SM_RESET_L is staying low. I am thinking why didn't I drop to brain mode sooner. After a few minutes of looking I get tangled around this (circuit SMC Reset "Button", Supervisor & AVREF Supply) and think it has to be something in the area. This is the only area that needed slight rework when I first started in on this board. There was a pad eaten away on R5000 and C5020. The power inputs of course. where else would water damage be.. I notice that PP3V3_S5_AVREF_SMC is 0.0V I check chip power, The PP3V3_S5_SMC & PPVIN_S5_SMCVREF are both present. Missing is the SMC_TPAD_RST_L & SMC_ONOFF_L both reading low. I decided to change the chip. U 5110 was repealed and replaced. I noticed that with the chip off the unit would green light and do a S0 bounce! I dropped on the replacement U5110 sure I had it figured out and I am the man only to discover same problem. I was looking down a rabbit hole.
Please put me on the path of righteousness and help me find my way. I am in a rabbit hole and stuck.
