Sony Xperia S LT26i User manual

1257-2931 Rev 6
Sony Mobile Communications AB –Company Internal
Troubleshooting Guide
- mechanical -
Xperia S
LT26i, LT26ii, SO-02D

Trouble Shooting Guide Repair Instruction Mechanical/
1257-2931 Rev 6
Sony Mobile Communications AB –Company Internal
2(57)
CONTENTS
1Problem Areas................................................................................4
1.1 Power....................................................................................................4
1.1.1 Will not power on or will switch off randomly...........................................4
1.2 Keys ......................................................................................................5
1.2.1 Menu, Home and Back Keys.......................................................................5
1.2.2 Key Camera..................................................................................................5
1.2.3 Key Volume..................................................................................................6
1.2.4 Key On/Off....................................................................................................7
1.3 Touch Screen .......................................................................................9
1.3.1 Touch Screen malfunction..........................................................................9
1.4 Display................................................................................................11
1.4.1 Graphics & Illumination ............................................................................11
1.5 LED/Illumination.................................................................................13
1.5.1 LED/Illumination ........................................................................................13
1.5.2 Key Illumination.........................................................................................14
1.6 Speaker...............................................................................................16
1.6.1 Loudspeaker..............................................................................................16
1.7 Earphone ............................................................................................18
1.7.1 Earphone....................................................................................................18
1.8 Microphone.........................................................................................19
1.8.1 Microphone................................................................................................19
1.8.2 Secondary Microphone.............................................................................22
1.9 Vibrator...............................................................................................24
1.9.1 Vibrator not generating alerts ..................................................................24
1.10 Camera................................................................................................26
1.10.1 Camera defects..........................................................................................26
1.10.2 Secondary Camera....................................................................................27
1.11 Flash LED ...........................................................................................28
1.11.1 Flash LED not flashing..............................................................................28
1.12 Bluetooth and W-LAN malfunctions.................................................29
1.12.1 Bluetooth and W-LAN malfunctions ........................................................29
1.13 NFC .....................................................................................................30
1.13.1 NFC malfunctions......................................................................................30
1.14 GPS .....................................................................................................31
1.14.1 GPS malfunctions......................................................................................31
1.15 Compass.............................................................................................32
1.15.1 Compass fails ............................................................................................32
1.16 Accelerometer....................................................................................33
1.16.1 Accelerometer test fails............................................................................33
1.17 Gyroscope ..........................................................................................34
1.17.1 Gyroscope test fails ..................................................................................34
1.18 Ambient Light Sensor........................................................................35

Trouble Shooting Guide Repair Instruction Mechanical/
1257-2931 Rev 6
Sony Mobile Communications AB –Company Internal
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1.18.1 Light Sensor malfunctions .......................................................................35
1.19 Proximity switch.................................................................................37
1.19.1 Proximity switch malfunctions.................................................................37
1.20 Pressure Sensor.................................................................................39
1.20.1 Pressure Sensor test failed ......................................................................39
1.21 Water Proof.........................................................................................40
1.21.1 Water Proof test failed...............................................................................40
1.22 Real time clock...................................................................................41
1.22.1 Real time clock test failed.........................................................................41
1.23 Total call time.....................................................................................42
1.23.1 Total call time failed ..................................................................................42
1.24 External Memory................................................................................43
1.24.1 External Memory test failed......................................................................43
1.25 Security...............................................................................................44
1.25.1 Security failed............................................................................................44
1.26 FM Radio.............................................................................................45
1.26.1 No/Poor FM Radio reception ....................................................................45
1.27 Battery Health test .............................................................................47
1.27.1 Battery Health test fails.............................................................................47
1.28 HDMI Test ...........................................................................................48
1.28.1 HDMI test fails............................................................................................48
1.29 Network & Signal................................................................................49
1.29.1 No/Poor signal ...........................................................................................49
1.30 SIM ......................................................................................................52
1.30.1 SIM not detected........................................................................................52
1.30.2 Incorrect SIM indicated.............................................................................52
1.31 Charging.............................................................................................53
1.31.1 Battery will not charge..............................................................................53
1.32 HandsFree by Wire.............................................................................54
1.32.1 Connection to Portable HandsFree fails..................................................54
1.33 Data Communication .........................................................................56
1.33.1 Data transfer via System Connector fails................................................56
2Revision History...........................................................................57

Trouble Shooting Guide Repair Instruction Mechanical/
1257-2931 Rev 6
Sony Mobile Communications AB –Company Internal
4(57)
1 Problem Areas
1.1 Power
1.1.1 Will not power on or will switch
off randomly
Check:
Check whether the phone vibrates and the Keyboard
illuminates after the Key On/Off is depressed.
Action:
If activation of the Vibrator is detected, refer to section 1.4
‘Display’.
If NO activation of the Vibrator is detected, check that the
battery is charging when connected to a charger.
Follow test instruction (Charging via USB), Diagnostic
Battery / Charging status.
Check:
Inspect the contact pads on the Battery.
Action:
1. If dirty or oxidized –clean the pads.
2. If damaged –replace the Battery.
Check:
Inspect the Battery Contact pins on the main PBA.
Action:
1. If dirty or oxidized –clean the contact pins.
2. If adhesive is detected on the contact pins, use an eraser
to gently rub off the adhesive.
3. If damaged –replace board.
4. Check current draw in off mode by using “Dummy Battery”
(max 1 mA)
5. Replace Board
Check:
Inspect the Key On/Off.
Action:
1. Refer to section 1.2.4 ‘Key On/Off’.
2. Replace board.

Trouble Shooting Guide Repair Instruction Mechanical/
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Sony Mobile Communications AB –Company Internal
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Problem Areas
1.2 Keys
1.2.1 Menu, Home and Back Keys
Check:
Inspect the menu, home and back keys on the Cover Front.
Action:
1. Refer to the section 1.3 ‘Touch Screen’.
2. Replace board.
1.2.2 Key Camera
Check:
Inspect the Key Camera on the Cover Front Assy.
Action:
If the Key Camera is damaged –replace it.
Check:
Inspect the Key Camera push switch on the Main FPC.
Action:
If (a) or (b) is dirty or clogged –clean it.

Trouble Shooting Guide Repair Instruction Mechanical/
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Problem Areas: Keys
Check:
Check the BtB connector of the FPC Main Assy to the Main
PBA.
Action:
1. If not properly connected –disconnect and reconnect.
2. If dirty or oxidized –clean both sides of the BtB
connector.
Check:
Inspect the FPC Main Assy.
Action:
1. If the FPC Main Assy or its BtB connector is damaged –
replace the Main FPC.
2. Replace board.
1.2.3 Key Volume
Check:
Inspect the Key Volume on the Cover Front Assy.
Action:
If the Key Volume is damaged –replace it.

Trouble Shooting Guide Repair Instruction Mechanical/
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Problem Areas: Keys
Check:
Inspect the key volume push switch on the FPC Main Assy.
Action:
If (a) or (b) or (c) is dirty or clogged –clean it.
Check:
Check the BtB connector of the FPC Main Assy to the Main
PBA.
Action:
1. If not properly connected –disconnect and reconnect.
2. If dirty or oxidized –clean both sides of the BtB
connector.
Check:
Inspect the FPC Main Assy.
Action:
1. If the FPC Main Assy or its BtB connector is damaged –
replace the FPC Main Assy.
2. Replace board.
1.2.4 Key On/Off
Check:
Inspect the Key On/Off on Cover Front Assy.

Trouble Shooting Guide Repair Instruction Mechanical/
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Problem Areas: Keys
Action:
If the Key On/Off is damaged –replace it.
Check:
Inspect the BtB connector of the FPC Jack Assy to the main
PBA.
Action:
1. If not properly connected –disconnect and reconnect.
2. If dirty or oxidized –clean both sides of the BtB
connector.
Check:
Inspect the FPC Jack Assy.
Action:
1. If the FPC Jack Assy or its BtB connector is damaged –
replace the FPC Jack Assy.
2. Replace board.

Trouble Shooting Guide Repair Instruction Mechanical/
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Problem Areas
1.3 Touch Screen
1.3.1 Touch Screen malfunction
Check:
Inspect the touch screen of the Cover Front.
Action:
1. If dirty –clean it.
2. If the touch screen is damaged –replace the Cover Front
Assy.
Check:
Inspect the BtB connector of the Cover Front Assy to the
Main FPC.
Action:
1. If not properly connected –disconnect and reconnect.
2. If dirty or oxidized –clean both sides of the BtB
connector.
Check:
Inspect the Cover Front Assy.
Action:
If the Cover Front Assy or its BtB connector is damaged –
replace the Cover Front Assy.

Trouble Shooting Guide Repair Instruction Mechanical/
1257-2931 Rev 6
Sony Mobile Communications AB –Company Internal
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Problem Areas :Touch Screen
Check:
Inspect the BtB connector of the FPC Main Assy to the Main
PBA.
Action:
1. If not properly connected –disconnect and reconnect.
2. If dirty or oxidized –clean both sides of the BtB
connector.
Check:
Inspect the Main FPC.
Action:
1. If the FPC Main Assy or its BtB connector is damaged –
replace the Main FPC.
2. Replace board.