Asus ZENFONE T500 Panduan Servis - Halaman 5
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Halaman Cetak
ASUS T500
2. Cannot power on
Solution:
1
Check if the battery connector and its soldering are oxidized or damaged
2
Check if the following voltage, and GND has short circuit or abnormal voltage
VBAT
VCORE
VSYS
1.825/2.2V
VPA
VTXCO
VA
VCAMA
VCN28
VCAMA
VUSB
VEMC_3V3
3
Check if start-up circuit is abnormal
4
If the start-up circuit is about 20 MA, check if the soldering of crystal oscillator circuit is normal
5
For those start-up current abnormally above 1A, check if VBAT circuit is shorted to ground, investigate each
locations' grounding diodes and other key components
6
For those start-up current abnormally around 100MA, touch if there is any heating part on MB and focus on
their investigation
7
X-ray: check each main chip's soldering, CPU/Flash/PMIC(MSM8916/PM8916)
8
Add soldering or re-solder each main chip and confirm again
9
Replace CPU/Flash/PMIC
Battery connector
3.8--4.2V
0.7--1.4V
0.5-3.4V
2.8V
2.8V
2.8V
2.8V
2.8V
3.3V
3.3V
Flash
MB Service Manual
CPU MSM8912
PMIC
PM8916
5