DoubleGrinder
New member
Hello, I have a board that had previous water damage that is pulsing PP5v_s4.
I can eliminate the pulsing of PP5v_s4 when I remove R7192, when this resistor is removed I get:
PP5v_s4: 5.014v
CPUVR_VCC: 1.6v
It seems when this resistor is put back into place PP5v_s4 begins pulsing again.
I have tried replacing U7100 twice with the same result of 1.6v on CPUVR_VCC and subsequent pulsing on PP5v_S4
I also tried replacing U7650 before I discovered the issue is pertaining to the connection point at R7192
When R7192 is removed I get:
USB-c Ammeter: 20v,0.05A
PP5v_s0: 5.115v
PP3v_s0: 3.3v
ALL_SYS_PWRGD: 3.2v
PPVCCCPU_S0G: 0v
PPbus_G3h_CPU: 13.03v
When R7192 is on the board I get:
USB-C Ammeter: 20v, 0.01-0.09A pulsing
PP5v_s5: 5.2v
PP5v_s4: 0.0-3.1v pulsing
ALL_SYS_PWRGD: 0V
PPVCCCPU_S0G: 0V
PPBUS_G3H_CPU: 13.03V
I'm not really sure what the next steps are, I'm confused on why CPUVR_VCC is at 1.6v as I believe the joining of the 1.6v and 5.1v from PP5v_s4 at R7192 is causing U7650 to pulse but I can't find any reason why CPUVR_VCC is at 1.6v on it's own
I can eliminate the pulsing of PP5v_s4 when I remove R7192, when this resistor is removed I get:
PP5v_s4: 5.014v
CPUVR_VCC: 1.6v
It seems when this resistor is put back into place PP5v_s4 begins pulsing again.
I have tried replacing U7100 twice with the same result of 1.6v on CPUVR_VCC and subsequent pulsing on PP5v_S4
I also tried replacing U7650 before I discovered the issue is pertaining to the connection point at R7192
When R7192 is removed I get:
USB-c Ammeter: 20v,0.05A
PP5v_s0: 5.115v
PP3v_s0: 3.3v
ALL_SYS_PWRGD: 3.2v
PPVCCCPU_S0G: 0v
PPbus_G3h_CPU: 13.03v
When R7192 is on the board I get:
USB-C Ammeter: 20v, 0.01-0.09A pulsing
PP5v_s5: 5.2v
PP5v_s4: 0.0-3.1v pulsing
ALL_SYS_PWRGD: 0V
PPVCCCPU_S0G: 0V
PPBUS_G3H_CPU: 13.03V
I'm not really sure what the next steps are, I'm confused on why CPUVR_VCC is at 1.6v as I believe the joining of the 1.6v and 5.1v from PP5v_s4 at R7192 is causing U7650 to pulse but I can't find any reason why CPUVR_VCC is at 1.6v on it's own