Asus P750 Service Manual download pdf (Page 12)

GTC ■ Service Manual

ASUS Proprietary 12

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6. Trouble shooting Case

6.1 System can＇t Boot!

The main of the reason is related for component short and incorrect in

“Power-On Sequence” issues. First, we can check the Current of the device

during the OS booting process then try to measure the “Power ON

Sequence”. In P750 design concept; The System will auto Power On in two

conditions One is first connect to device, another the voltage drop below

2.8V m than 2.8V, the system should

n he reset button

until the power supply working when we want to make sure the OS booting

pro

.3V

Must inspect the soldering status to eliminate

iode reverse issue ) .

booting abnormal.

C. VCC_3.0V, VCC_1.8V, VCC_CORE > 1.3V, VCC_PLL = 1.3V,

ect of the voltage then we can try to check the

The Item C is noraml but the SYS_EN / PWR_EN< 2.9V.It always the solder

issue fo

fro backup battery. If the voltage more

ot booting automatically. It is recommendation for hold on t

cess is activated.

.1.1 Power on sequence

lease check “Power on Sequence“ for each Voltage:

A. V_BAT = power supply voltage

The proposal of V_BAT is for System power.

The check point is C228.1

B. V_BKBT = 3

If V_BKBT < 3.3V，

the component U44 defective ( floating and d

It will cause the charged failure for the backup battery and OS

VCC_SRAM = 1.1V

If found the incorr

soldering floating or mistake component (U41, L8, L9, L10).

SYS_EN = 2.9V

PWR_EN = 2.9V

r CPU( U1). Try to rework the U1 and replace it.

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Asus P750 Service Manual Page 12

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