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Huawei Ascend Maintenance Manual
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Y210 Mobile P
hone
Maintenance Manual
9
Principles and Failure
Analysis
Issue 1.0 (
2012
-
11
-
28
)
Huawei Proprietar
y and Confidential
Copyright © Huawei Technologies Co., Ltd
.
33
H: voltage hi
gher than 1.3
V
. L: voltage l
ower than 0.5
V
.
WCDMA
transmi
ssion failure (use
W2100 as an exam
ple)
Before starti
ng the following pr
ocess, ensure that t
he USIM card and t
he antenna are wel
l
connected.
37
39
Table of Contents
About this Document
3
Change History
3
Table of Contents
4
1 Product Overview
6
Appearance
6
Features
7
2 Applicable Scope and Precautions
9
Applicable Scope
9
Precautions
9
How to Obtain Product and Repair Information
9
3 Exploded View
10
4 Components on the PCBA
12
5 Software Upgrade
14
Upgrade Preparation
14
Performing an Upgrade
14
6 Maintenance Tools
16
7 Disassembly Procedure
18
8 Assembly Procedure
22
9 Principles and Failure Analysis
26
Block Diagram
26
Functions of the PCBA
27
Baseband Unit
31
Power-On Management Circuits
31
Charging Management Circuits
35
RF Unit
36
RF Failure
36
Gps
40
Wi-Fi/Bluetooth/Fm Module
40
Peripheral Circuits
42
Display
42
Camera
45
Usb
48
Headset Jack
49
Keys and Buttons
51
Tricolor Indicator and Touch Key Backlight Circuits
52
Battery Connector
53
Accelerometer
54
Compass
55
Proximity Sensor
55
Vibration Motor
57
Receiver
58
Microphone
61
During a Call
62
Touch Panel
62
SIM Card
63
Microsd Card
64
10 Solder Points on the PCBA and BGA Chip
66
11 Functional Tests
72
MMI Test
72
Voice Call Test
75
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Huawei Ascend Specifications
General
Brand
Huawei
Model
Ascend
Category
Cell Phone
Language
English
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