Service manual

GTC Service Manual
ASUS Proprietary 28
華
華
碩
碩
電
電
腦
腦
6. Power consumption
We will support two mode to check our device in the power
consumption test. In the Power Off mode, the value should be approach 0 mA.
Insert the SIM card and Micro SD before the power on .The Sleep mode
active tool will be automatic executed by itself in the Micro SD card. It will
take 3 second when the screen turn to blend, system convert to sleep mode.
The value should be approach 2~3mA in the lowest level.
If there out of the above range, please check the value step by step：
6.1
6.1 6.1
6.1 Power Off
Power Off Power Off
Power Off Mode
Mode Mode
Mode
If we found the value over the range in the Power Off mode, please follow
below check point step by step.
A. V_CORE 0V
V_IO 0V
B. Remove the R824 to determine the short issue from RF IC Side.
C. Remove the R125 to determine the short issue from Modem IC Side.
D. Check IC group on the VBAT network to determine Short defective of
the component.
6.2 Sleep Mode
6.2 Sleep Mode6.2 Sleep Mode
6.2 Sleep Mode
If we found the value over the range in the Power Sleep mode, please follow
below check point step by step.
A. Check R76 by Amp meter. 250uA↓
B. Check R77 by Amp meter. 150uA↓
a. Please check the soldering condition on the BGA package of the
CPU by X-ray detection.
C. Review all of the Chips on each power network of the device. Which part
will short with GND is our direction of the repair. But still a huge
working to find the root cost. We will suggest the chip priority : BGA /
CSP package→IC→…..
D. The short with GND condition is not obviously, we can use the
temperature different to help us judge that soon.