Touch Screen; Touch Screen Malfunction - Sony Xperia tipo ST21i Troubleshooting Manual

Problem Areas
1.3

Touch Screen

1.3.1 Touch Screen malfunction

Make sure that the Software Version is the latest!
Check:
Inspect the touch screen.
Action:
If dirty – clean it.
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.
1266-1682 Rev 4
©
Sony Mobile Communications AB – Company Internal
Troubleshooting Guide (mech)
8(44)