LENOVO S930 Cellphone Service Manual
Page 2
Content
1CELLPHONE APPEARANCE ....................................................................................................4
2LAYOUT OF MOTHERBOARD .................................................................................................4
3BASEBAND....................................................................................................................................6
3.1 LCD DISPLAY ...........................................................................................................................7
3.1.1 When the device is turned on there’s nothing on screen ......................................................7
3.1.2 LCD backlight doesn’t light up. ...........................................................................................8
3.2 CAMERAS DO NOT WORK PROPERLY..........................................................................................8
3.2.1 Back camera does not work properly...................................................................................8
3.2.2 Front camera doesn’t work properly..................................................................................10
3.3 RING AND VIBRATION.............................................................................................................11
3.3.1 It does not vibrate..............................................................................................................11
3.3.2 It does not ring................................................................................................................... 11
3.4 CHARGING..............................................................................................................................13
3.4.1 It doesn’t show the charging indicator when charger is plugged in. .................................13
3.4.2 It shows the charging indicator. But the battery can’t be fully charged.............................15
3.5 KEYBOARD AND KEYBOARD BACKLIGHT................................................................................16
3.5.1 Keyboard can’t work properly............................................................................................16
3.5.2 Keyboard backlight doesn’t light up. .................................................................................17
3.6 AUDIO PROBLEMS DURING PHONE CALLS ...............................................................................18
3.6.1 You can’t hear the person you are talking to during a phone call. ....................................18
3.6.2 You can’t be heard by the person you are talking to during a phone call. .........................19
3.7 DEVICE WILL NOT TURN ON. ...................................................................................................20
4RADIO FREQUENCY ................................................................................................................21
4.1 GSM CALIBRATION DURING PRODUCTION ..............................................................................21
4.1.1 GSM AFC calibration........................................................................................................21
4.1.2 GSM Rx Path Loss calibration ..........................................................................................21
4.1.3 GSM AFC calibration........................................................................................................22
4.2 GSM COMPREHENSIVE TEST...................................................................................................24
4.2.1 Switching spectrum and PVT template are over the limits. ...............................................24
4.2.2 Frequency Error is too big.................................................................................................24
4.2.3 Phase Error is too big........................................................................................................25
4.2.4 Power output related problems..........................................................................................26
4.3 WCDMACALIBRATION DURING PRODUCTION .......................................................................27
4.3.1 WCDMA Rx Path Loss calibration....................................................................................27
4.3.2 WCDMA TPC calibration..................................................................................................28
4.4 WCDMACOMPREHENSIVE TEST............................................................................................29
4.4.1 ACLR or SEM....................................................................................................................29
4.4.2 The results of PowerControl comprehensive test are not good..........................................29
4.4.3 FrequencyErr.....................................................................................................................29
4.5 WIFI TEST...............................................................................................................................30
