TCL T728 Service Manual
TCL Mobile Communication
CO., Ltd
第
3
页
共
32
页
Contents:
Precautions for Repair Work ..................... 4
Chapter 1 Introduction
............................... 6
1.1 Layout .................................................................................................................................6
1.2 Introduction.........................................................................................................................6
Chapter 2 Assemble and disassemble .............. 7
2.1 Schematic process of disassembly ......................................................................................7
2.2 The process of assembly ...................................................................................................16
Chapter 3 Logic Part ........................... 17
3.1 PM IC MT6305.................................................................................................................17
3.2 CPU MT6205B description ..............................................................................................18
3.3 Power ON Control ............................................................................................................18
3.4 Charge Circuit...................................................................................................................20
3.5 Back light circuit for LCD ................................................................................................20
3.6 Motor circuit .....................................................................................................................20
3.7 Audio Part .........................................................................................................................20
3.8 LCD displaying circuit......................................................................................................21
3.9 SIM Card circuit ...............................................................................................................21
Chapter 4 RF Part.............................. 22
4.1 RX Part .............................................................................................................................23
4.2 TX Part..............................................................................................................................24
4.3 Power Amplifier................................................................................................................24
Chapter 5 Tools and FAQ ........................ 25
5.1 Tools..................................................................................................................................25
5.2 No Power On ....................................................................................................................25
5.3 No Display ........................................................................................................................26
5.4 No backlight......................................................................................................................27
5.5 NO transmitting ................................................................................................................29
5.6 No ring tone ......................................................................................................................30
5.7 No vibration ......................................................................................................................30
5.8 No Net work......................................................................................................................31
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