Problem Areas; Power; Will Not Power On Or Will Switch Off Randomly - Sony Xperia S LT26i Troubleshooting Manual

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.
1257-2931 Rev 6

Sony Mobile Communications AB – Company Internal
Trouble Shooting Guide Repair Instruction Mechanical/
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