Display; Graphics & Illumination - Sony Xperia tipo ST21i Troubleshooting Manual

Problem Areas
1.4

Display

1.4.1 Graphics & Illumination
Check:
Check whether the phone vibrates after the on/off key has
been pressed.
Action:
If the activation described above is not detected, refer to
section 1.1 'Power'.
Check:
Inspect the BtB connector of the Front Assy to the PBA.
Action:
1. If not properly connected – disconnect and reconnect.
2. If dirty or oxidized – clean it.
Check:
Inspect the FPC of the Front Assy.
Action:
1. If the FPC or the touch screen is damaged – replace the
Front Assy.
2. Replace PBA.
Check:
Inspect the both sides of the ZIF connector on the Main PBA
and the LCD FPC.
Action:
1. If not properly connected – disconnect and reconnect.
2. If dirty or oxidized – clean it.
1266-1682 Rev 4
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Sony Mobile Communications AB – Company Internal
Troubleshooting Guide (mech)
9(44)