Mobile Phone STORM (Smartphone) Service Manual
Page 2of 38
CONTENT
CHAPTER 1: SUMMARY....................................................................................................................4
CHAPTER 2: PCBA OVERVIEW .......................................................................................................6
2.1STORM-TOPSIDE-LAYOUT ..........................................................................................................6
2.2STORM-BACK SIDE-LAYOUT.......................................................................................................7
CHAPTER 3: EXPLANATION OF SCHEMATIC.............................................................................8
3.1 BASE BAND CHIP MSM8939 FEATURES..........................................................................................8
3.2POWER MANAGER UNIT PM8916 INTRODUCTION ...........................................................................9
3.3 RF CHIP WTR4905 DEVICE INTRODUCTION..................................................................................10
3.4 INTERFACE FUNCTIONAL CIRCUIT.................................................................................................10
3.4.1 Charging Circuit....................................................................................................................10
3.4.2 Battery connector interface ...................................................................................................11
3.4.3 Microphone Interface............................................................................................................11
3.4.4 Receiver Interface .................................................................................................................12
3.4.5 LCD Connector Interface......................................................................................................12
3.4.6 Camera Interface Circuit .......................................................................................................13
3.4.7 SIM Card Connector Interface ..............................................................................................13
3.4.8 TF card Interface...................................................................................................................14
3.4.9 Sensor Interface.....................................................................................................................14
CHAPTER 4: MOBILE FAILURE ANALYSIS................................................................................16
4.1 POWER ON ISSUE ANALYSIS ...........................................................................................................17
4.2 CHARGING ISSUE ANALYSIS ...........................................................................................................18
4.3 DISPLAY ISSUE ANALYSIS...............................................................................................................19
4.4 NO INCOMING &OUTGOING VOICE ISSUE ANALYSIS.....................................................................20
4.5HEADSET ISSUE ANALYSIS..............................................................................................................21
4.6 NO VOICE IN SPEAKER ISSUE ANALYSIS .........................................................................................22
4.7 TOUCH SCREEN ISSUE ANALYSIS....................................................................................................23
4.8 CAMERA ISSUE ANALYSIS ..............................................................................................................24
4.9 VIBRATING ISSUE ANALYSIS...........................................................................................................25
