Logic board:820-00165A
History: No liquid spill or corrosion. Has come after repair attempt by others. Customer says there was charging issue but the unit was working well but i've received it as dead unit.
MAgsafe light glows green and then orange , No fan spin. consumption on DC supply 0.0027A.
PPBUS_G3H_R-1.16V(measured at D7005)
ISL6259 measurements:
PIN1-0V
PIN2-15.8V
PIN3-4.12V
PIN10-3.3V
PIN11-3.3V
PIN12-3.42V
PIN17-18: 1.12V
PIN27-28:1.12V
Resistance between pin17-18 -3.5 Ohms
Resistance between pin27-28:21 Ohms
Charger IC seems to be replaced by earlier technician-so i replaced it with a new IC to be sure. All the measurements are with new charging IC. Charging IC is soldered properly(checked under microscope).
Can this unit be revived?? Please suggest the way forward.
PS: I've checked resistor R7110/7111/7185/7186 out of circuit and they all measure as per schematic.
History: No liquid spill or corrosion. Has come after repair attempt by others. Customer says there was charging issue but the unit was working well but i've received it as dead unit.
MAgsafe light glows green and then orange , No fan spin. consumption on DC supply 0.0027A.
PPBUS_G3H_R-1.16V(measured at D7005)
ISL6259 measurements:
PIN1-0V
PIN2-15.8V
PIN3-4.12V
PIN10-3.3V
PIN11-3.3V
PIN12-3.42V
PIN17-18: 1.12V
PIN27-28:1.12V
Resistance between pin17-18 -3.5 Ohms
Resistance between pin27-28:21 Ohms
Charger IC seems to be replaced by earlier technician-so i replaced it with a new IC to be sure. All the measurements are with new charging IC. Charging IC is soldered properly(checked under microscope).
Can this unit be revived?? Please suggest the way forward.
PS: I've checked resistor R7110/7111/7185/7186 out of circuit and they all measure as per schematic.
Comment