rob777
Member
Board had liquid damaged exclusively around U7100, cannot find evidence elsewhere.
Board gets orange and green lights on charger but not power on. PPBUS_G3H measures a fluctuating 3.9 - 4.1v, removed F7140 and PPVBAT_G3H_CHRG_REG measures the same fluctuation.
Changed U7100 numerous times, Q7130 and a bunch of resistors and caps that looked bad/measured out of spec.
U7100 readings:
Pin 19 - 5.5v
Pin 20 - 5.5v schematics say 5.1v here for pin 19 and 20
Pin 2 - 16.45v CHRG_DCIN
Pin 12 - 3.4v
Pin 3 - 4v
Pin 1 - 0v CHRG_AGATE at R7186 pin 1 measures 6.78v
I'm stuck, is the 5.5v at Pin 19/20 something to be concerned about as schematics say 5.1v
Why is R7186 got 6.78v at one side and not the other? It's a resistor which has been changed and measures 326k instead of 332k
What typically causes a voltage to fluctuate like that?
Thanks for the help
Board gets orange and green lights on charger but not power on. PPBUS_G3H measures a fluctuating 3.9 - 4.1v, removed F7140 and PPVBAT_G3H_CHRG_REG measures the same fluctuation.
Changed U7100 numerous times, Q7130 and a bunch of resistors and caps that looked bad/measured out of spec.
U7100 readings:
Pin 19 - 5.5v
Pin 20 - 5.5v schematics say 5.1v here for pin 19 and 20
Pin 2 - 16.45v CHRG_DCIN
Pin 12 - 3.4v
Pin 3 - 4v
Pin 1 - 0v CHRG_AGATE at R7186 pin 1 measures 6.78v
I'm stuck, is the 5.5v at Pin 19/20 something to be concerned about as schematics say 5.1v
Why is R7186 got 6.78v at one side and not the other? It's a resistor which has been changed and measures 326k instead of 332k
What typically causes a voltage to fluctuate like that?
Thanks for the help