Asus ZENFONE T500 서비스 매뉴얼 - 페이지 5

{카테고리_이름} Asus ZENFONE T500에 대한 서비스 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Asus ZENFONE T500 31 페이지. Mobile phone tools
Asus ZENFONE T500에 대해서도 마찬가지입니다: 설치 매뉴얼 (8 페이지)

페이지 인쇄

ASUS T500

2. Cannot power on

Solution:

Check if the battery connector and its soldering are oxidized or damaged

Check if the following voltage, and GND has short circuit or abnormal voltage

VBAT

VCORE

VSYS

1.825/2.2V

VPA

VTXCO

VCAMA

VCN28

VCAMA

VUSB

VEMC_3V3

Check if start-up circuit is abnormal

If the start-up circuit is about 20 MA, check if the soldering of crystal oscillator circuit is normal

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

For those start-up current abnormally around 100MA, touch if there is any heating part on MB and focus on

their investigation

X-ray: check each main chip's soldering, CPU/Flash/PMIC(MSM8916/PM8916)

Add soldering or re-solder each main chip and confirm again

Replace CPU/Flash/PMIC

Battery connector

3.8--4.2V

0.7--1.4V

0.5-3.4V

2.8V

3.3V

Flash

MB Service Manual

CPU MSM8912

PMIC

PM8916