Hi people,
Ideapad 130-15IKB
LA-G202P
CPU: i5 8250U
The laptop turns on without picture. All voltages are present except +VCCGT. Probably POST not starting because current stays around 300mA. I've checked resistance and voltages:
PL602 - 28ohm - 1.0 VALWP - 1.04V present
PL502 - 231ohm - 1.2VP - 1.2V
PLA1 - 17ohm - VCCSA - 1.03V
PLZ1 - 4ohm - VCCCORE - 0.84V
PLZ2 - 4ohm - VCCCORE - 0.84V
PLG1 - 7ohm - VCCGT - 0V
The VCCGT comes from PUG1 (RT9610CGQW). Signals are:
EN-5V,
PHASE-0V,
UGATE-0V,
BOOT-4,7V,
PWM-2.5V,
LGATE-0V,
VCC_GT-5V
PWM signal comes from PUZ1 (RT3602AE). All mosfets are good. I have noticed that PWMs on PUZ2 and PUZ3 (responsible for VCCCORE) are 0.22V, and also comes from PUZ1.
I have already replaced PUZ1, PUG1,reprogrammed BIOS and EC. No change and no ideas, what to do next. Oscillators 32kHz and 25MHz are working. The RSMRST is high so I assumed that EC is good.
Ideapad 130-15IKB
LA-G202P
CPU: i5 8250U
The laptop turns on without picture. All voltages are present except +VCCGT. Probably POST not starting because current stays around 300mA. I've checked resistance and voltages:
PL602 - 28ohm - 1.0 VALWP - 1.04V present
PL502 - 231ohm - 1.2VP - 1.2V
PLA1 - 17ohm - VCCSA - 1.03V
PLZ1 - 4ohm - VCCCORE - 0.84V
PLZ2 - 4ohm - VCCCORE - 0.84V
PLG1 - 7ohm - VCCGT - 0V
The VCCGT comes from PUG1 (RT9610CGQW). Signals are:
EN-5V,
PHASE-0V,
UGATE-0V,
BOOT-4,7V,
PWM-2.5V,
LGATE-0V,
VCC_GT-5V
PWM signal comes from PUZ1 (RT3602AE). All mosfets are good. I have noticed that PWMs on PUZ2 and PUZ3 (responsible for VCCCORE) are 0.22V, and also comes from PUZ1.
I have already replaced PUZ1, PUG1,reprogrammed BIOS and EC. No change and no ideas, what to do next. Oscillators 32kHz and 25MHz are working. The RSMRST is high so I assumed that EC is good.
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