Sony C2104 - Power; Will not power on or will switch off randomly

Troubleshooting Guide (mech)
1273-2281 Rev2
 Sony Mobile Communications AB –
Company Internal
4(48)
1 Problem Areas
1.1 Power
1.1.1 Will not power on or will switch
off randomly
Check:
Check whether the phone vibrates by pressing the on/off
key.
Action:
If activation of the vibrator is detected, refer to section 1.4
‘Display’.
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.
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 Main PBA.
Check:
Inspect the on/off key.
Action:
1. Refer to section 1.2.3 ‘Key On/Off’.
2. Replace Main PBA.