Table of Contents
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CHAPTER 1 MAINBOARD WORKING PRINCIPLE ................................................................................................................ 4
CHAPTER 2 MAINBOARD DEVICE LOCATION PLAN AND MATERIAL BOM INFORMATION ................................................ 7
CHAPTER 3 MAINTAIN FLOW DIRECTION ...................................................................................................................... 11
3.1
3.3
STANDLONE VERSION WRITE STATION TOOL GUIDANCE
3.4
WRITE CUSTOM MADE INFORMATION GUIDANCE
CHAPTER 4 ADVANCED MAINTAIN CONDITION AND TOOL DETAILED ACCOUNT .......................................................... 16
CHAPTER 5 MOBILE PRINCIPLE AND MALFUNCTION ANALYSIS .................................................................................. 17
5.1
.................................................................................................................................................... 17
5.1.1 NO CURRENT.................................................................................................................................................................. 17
5.1.2
LOWER CURRENT
5.1.3
5.3
utomatic shutdown crash ................................................................................................................................................... 28
5.3.1 auto power-off ................................................................................................................................................................... 28
5.3.2
SYSTEM HALTED
5.4
MOBILE PHONE HOT
5.5
................................................................................................................................................................ 34
NOT RING
5.5.1 speaker noumenon bad ...................................................................................................................................................... 34
5.5.2 speaker access ................................................................................................................................................................... 34
5.6
.......................................................................................................................................................... 37
5.7
,
NO SPEAKER
LOW SPEAKER VOICE
5.8
,
NO SIGNAL
FEEBLE SIGNAL
5.9
5.9.
1
NO RECOGINZE
5.9.2
5.10
NO CAMERA SHOOTING
5.11
TOCUH SCREEN NO WORK
5.12
.................................................................................................................................................... 48
FAIL TO CHARGE
5.13
HEADSET TROUBLE
5.14 FM ........................................................................................................................................................................ 54
5.15 GPS WIFI BT ...................................................................................................................................................... 56
5.16
5.16.1 MOTOR .......................................................................................................................................... 错误！未定义书签。
5.16.2 G-SENSOR .................................................................................................................................................................... 58
5.16.3 SIDEKEY ......................................................................................................................................... 错误！未定义书签。
CHAPTER 6 PCB BOARD AND BGA CHIP WELDING SPOT INDICATOR DIAGRAM ............................................................ 61
2013-10-18
YU220 service manualV1.0
............................................................................................................................................ 11
(
(
-
DIRECT
CURRENT MAIN POWER SUPPLY
(
-
............................................................................................................................................... 26
.............................................................................................................................................................. 30
,
STANDBY TIME IS SHORT
......................................................................................................................... 37
.................................................................................................................................... 39
.............................................................................................................................................. 41
SIM card ................................................................................................................................................. 41
................................................................................................................................................... 44
....................................................................................................................................... 44
...................................................................................................................................... 46
............................................................................................................................................... 51
............................................................................................................................ 57
Huawei secrets, no dispersion without permission
Content
...................................................................... 13
....................................................................................................... 15
..................................................................................................... 15
) ...................................................................................... 19
) ....................................................................................... 23
......................................................................................................... 32
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