- I cleaned the board, there where some small areas where you could see a bit of liquid damage. After cleaning it looks ok.
- Light from power adapter is green
- Checked the following power rails:
PPBUS_G3H: 8.4V
PPVIN_S5_CPU_IMVP_ISNS: 8.4V
PP18V5_DCIN_CONN: 17.1V
PP3V42_G3H_REG: 3.4V
PP5V_S3_REG: 0V
PP5V_S0_REG: 0V
PPVCORE_S0_CPU_REG: 0V
PP3V3_S5_REG: 3.3V
PP3V3_S3_FET: 0V
Tried to get to the source why PP5V_S3_REG is 0V.
- Checked U7201(TPS51220) enable:
- EN1: 0V
- EN2: 3.4V
Followed EN1 / P5VS3_EN which is same as PM_SLP_S4_L (double checked voltage also 0), which ends in U1400 (MCP79).
My only idea left is that the C7812 could be broken and pulls PM_SLP_S4_L to ground. But C7812 looks like it is not put on the board (there was a No Stuff comment on the diagram).
Followed source where PP3V3_S3_FET is supposed to come from. Ended up at Q7910. Source of the MOSFET is PP3V3_S3_P3V3S3FET, which I measured 3.3V. P3V3S3_SS is around 3.15V, which if I understand it correctly explains that the MOSFET switches PP3V3_S3_FET off. Then I tried to figure out why P3V3S3_SS is 3.15V. This is due to P3V3S3_EN is 0V.
P3V3S3_EN is PM_SLP_S4_L and so the reason is the same as above.
Now I'm stuck as I cannot tell why PM_SLP_S4_L is 0V. If anybody has some ideas what to do, I would greatly appreciate it.
- Light from power adapter is green
- Checked the following power rails:
PPBUS_G3H: 8.4V
PPVIN_S5_CPU_IMVP_ISNS: 8.4V
PP18V5_DCIN_CONN: 17.1V
PP3V42_G3H_REG: 3.4V
PP5V_S3_REG: 0V
PP5V_S0_REG: 0V
PPVCORE_S0_CPU_REG: 0V
PP3V3_S5_REG: 3.3V
PP3V3_S3_FET: 0V
Tried to get to the source why PP5V_S3_REG is 0V.
- Checked U7201(TPS51220) enable:
- EN1: 0V
- EN2: 3.4V
Followed EN1 / P5VS3_EN which is same as PM_SLP_S4_L (double checked voltage also 0), which ends in U1400 (MCP79).
My only idea left is that the C7812 could be broken and pulls PM_SLP_S4_L to ground. But C7812 looks like it is not put on the board (there was a No Stuff comment on the diagram).
Followed source where PP3V3_S3_FET is supposed to come from. Ended up at Q7910. Source of the MOSFET is PP3V3_S3_P3V3S3FET, which I measured 3.3V. P3V3S3_SS is around 3.15V, which if I understand it correctly explains that the MOSFET switches PP3V3_S3_FET off. Then I tried to figure out why P3V3S3_SS is 3.15V. This is due to P3V3S3_EN is 0V.
P3V3S3_EN is PM_SLP_S4_L and so the reason is the same as above.
Now I'm stuck as I cannot tell why PM_SLP_S4_L is 0V. If anybody has some ideas what to do, I would greatly appreciate it.