rkrishnan
New member
Happy Thanksgiving!
I bought an A1707 that was liquid damaged. It sometimes turns on after leaving it alone for a while (albeit doesn't boot, but that might be a separate problem).
Right now, these are what I probed for (not in order). It shows 0.05A and 20V from the USB-C meter. I poured Alcohol on the board and it doesn't get that hot anywhere.
I think the main problem is that S5_PWRGD is missing even though P3V3S5_EN_RCD, PM_EN_PVXS5, and PPBUS_HS_OTH3V3 is present. Does this mean I have to change U7650? I don't see any damage near there. I don't have an ultrasonic cleaner so would prefer to root-cause it before purchasing one.
Thank you!
Rohit
I bought an A1707 that was liquid damaged. It sometimes turns on after leaving it alone for a while (albeit doesn't boot, but that might be a separate problem).
Right now, these are what I probed for (not in order). It shows 0.05A and 20V from the USB-C meter. I poured Alcohol on the board and it doesn't get that hot anywhere.
- PPBUS_G3H - 12.62V
- PP3V3_S5 - 3.327V
- SMC_PM_G2_EN - 3.42V
- PP3V3_G3H - 3.42V
- PP3V3_S4 - 0V
- PP5V_S5 - 5.15V
- PPBUS_HS_OTH3V3 - 12.62V
- P5VS0_TG - 0V
- P5VS0_VBST_R - 4.79V
- P5VS4_SW - 0V
- PM_EN_PVXS5 - 3.4V
- P5VS5_PGOOD - 0V
- PM_SLP_SUS_L - 0V
- S5_PWRGD - 0V 100Ohm to ground right after powering off but rises to 90k
- P5VS4_PGOOD - 0V
- PP3V3_S5 - 5V
- P3V3S5_SW - 3.3V
- PM_EN_PVXS5 - 3.42V
- P3V3S5_EN_RCD - 3.3V
- P3V3S5_COMP2 - 1.96V
I think the main problem is that S5_PWRGD is missing even though P3V3S5_EN_RCD, PM_EN_PVXS5, and PPBUS_HS_OTH3V3 is present. Does this mean I have to change U7650? I don't see any damage near there. I don't have an ultrasonic cleaner so would prefer to root-cause it before purchasing one.
Thank you!
Rohit