Contents
About This Document.................................................................................................................... ii
1 Product Overview .........................................................................................................................1
1.1 Appearance.......................................................................................................................................................1
1.2 Features............................................................................................................................................................2
2 Applicable Scope and Precautions ............................................................................................4
2.1 Applicable Scope..............................................................................................................................................4
2.2 Precautions.......................................................................................................................................................4
2.3 How to Obtain Product and Repair Information ..............................................................................................4
3 Exploded View...............................................................................................................................5
4 Components on the PCBA...........................................................................................................7
5 Software Upgrade .........................................................................................................................9
5.1 Upgrade Preparation.........................................................................................................................................9
5.2 Performing an Upgrade....................................................................................................................................9
6 Maintenance Tools......................................................................................................................11
7 Disassembly Procedure..............................................................................................................13
8 Assembly Procedure...................................................................................................................17
9 Principles and Failure Analysis ...............................................................................................21
9.1 Block Diagram...............................................................................................................................................21
9.1.1 Functions of the PCBA .........................................................................................................................22
9.2 Baseband Unit................................................................................................................................................26
9.2.1 Power-on Management Circuits............................................................................................................26
9.2.2 Charging Management Circuits ............................................................................................................30
9.3 RF Unit...........................................................................................................................................................31
9.3.1 RF Failure .............................................................................................................................................31
9.3.2 GPS.......................................................................................................................................................35
9.3.3 Wi-Fi/Bluetooth/FM Module................................................................................................................35
9.4 Peripheral Circuits..........................................................................................................................................37
9.4.1 Display..................................................................................................................................................37
9.4.2 Camera..................................................................................................................................................40