820-00165 No start
No water damage ,BUT! The Shield on U2800 come off and was rattling around inside the board -JOY! (Thunderbolt Host Ic). The customer said it was working while it rattled but then it stopped , I noticed the battery was low charge icon from a working motherboard. I tried with fully charged battery no change.
All rails were good until I got to PPVRTC_G3H it was very low I replaced u1900 and it came to 3.3V
U7501 gives 5V at PP5V_S5 C7505 and I get 3.3v at PP3V3_S5_REG_R
P5VS4RS3_EN_R is very low like 0.18v when I trigger SMC_ONOFF_L at pad it drops to 0v
Replacing U7501 with known good ic result no change.
SMC_PM_G2_EN is 2v.
No water damage ,BUT! The Shield on U2800 come off and was rattling around inside the board -JOY! (Thunderbolt Host Ic). The customer said it was working while it rattled but then it stopped , I noticed the battery was low charge icon from a working motherboard. I tried with fully charged battery no change.
All rails were good until I got to PPVRTC_G3H it was very low I replaced u1900 and it came to 3.3V
U7501 gives 5V at PP5V_S5 C7505 and I get 3.3v at PP3V3_S5_REG_R
P5VS4RS3_EN_R is very low like 0.18v when I trigger SMC_ONOFF_L at pad it drops to 0v
Replacing U7501 with known good ic result no change.
SMC_PM_G2_EN is 2v.
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