Service manual

GTC Service Manual
ASUS Proprietary 10
華
華
碩
碩
電
電
腦
腦
2. SYSTEM Can’t Boot
The main of the reason always focus on the component short and
incorrect Power-on Sequence. In personal opinion, the power consumption
of M930 can be check before the Power on Sequence. Please check the
Power consumption of the M930 via power supply in R&D comment. It
always judges SMT component defective issue: short, open. In general,
power range will below 1mA in the deep sleep mode (Not touch the Power
key of the device).
Please check the put low signal after we push the power key on the U32
pin 4.
3
33
3.1 P
.1 P.1 P
.1 Power
owerower
ower-
--
-on sequence
on sequenceon sequence
on sequence
A. The signal VBAT = power supply voltage
The VBAT can make sure the system power effective. Please check
the voltage on the CON23 pin1.
B. V_CORE = 1.3~1.45, V_IO = 1.8,
The signal V_CORE and V_IO can make sure cpu power domain
from PMU. Please check the voltage and try to eliminate component
soldering issue (cold soldering, float mounting) on the below item:
R77、R19 / R202、R76、R72
C. V_PLL = 1.3，
Please check the voltage and try to eliminate component soldering
issue (cold soldering, float mounting) on the below item:
R20.