Have an 820-3115 that's stumping me. Trackpad movement does not work in EFI or OS, but click/activation function of trackpad works in both EFI and OS. Have tried 3 test units (that are all known-good), and same behavior in each.
- No liquid damage; perfectly clean board.
- Have checked all relevant resistors on J5800/U5701 circuit, all check out fine.
- Missing PP5V_S5_CUMULUS
- PP3V3_S4 is present
- Replaced U5701 and U2700 out of desperation (no change)
- USB_TPAD_N is missing at R5702; is this normal, though?
What continuity should I be checking from J5800 to U5701 for this particular behavior? I have a feeling PP5V_S5 cumulus is the issue here, but can't locate the cause for it missing.
Thanks for all help.
- No liquid damage; perfectly clean board.
- Have checked all relevant resistors on J5800/U5701 circuit, all check out fine.
- Missing PP5V_S5_CUMULUS
- PP3V3_S4 is present
- Replaced U5701 and U2700 out of desperation (no change)
- USB_TPAD_N is missing at R5702; is this normal, though?
What continuity should I be checking from J5800 to U5701 for this particular behavior? I have a feeling PP5V_S5 cumulus is the issue here, but can't locate the cause for it missing.
Thanks for all help.