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Original post by: oldturkey03 ,

Text:

@captaintech I'd start off by using Sony's suggestions.

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:

1. If activation of the vibrator is detected, refer to section 1.4 ‘Display’.

2. If NO activation of the Vibrator is detected, check that the battery is charging when connected to a charger and do a HW master reset.

Follow 1281-3374 Test Instruction - mechanical chapter 2.3.7 (Charging via USB and Easy Charger), Diagnostic Battery / Charging status.

Check:

Inspect the on/off key.

Action:

Refer to section 1.2.3 ‘On/Off Key’.

Check:

Inspect the BtB connector of the Battery to Main PBA.

[image|1030226]

Action:

1. If not properly connected – disconnect and reconnect it.

2. If dirty or oxidized – clean the both sides of the BtB connector.

3. If the BtB connector, the Battery FPC or the Battery is damaged – replace the Battery.

4. Replace Main PBA.

1.2.3 On/Off Key

Check:

Inspect the external area of the On/Off Key.

Action:

If dirty – clean it.

Check:

Inspect the BtB connector of FPC Side Key to Main PBA.

Action:

1. If not properly connected – disconnect and reconnect it.

2. If dirty or oxidized – clean it.

3. If the FPC of FPC Side Key is damaged – replace the FPC Side Key

4. Replace Main PBA.

Check:

Inspect the area and position of the FPC Side Key (Power On/Off) (a) and On/Off Key (b).

[image|1030227]

Action:

1. If dirty – clean them.

2. If the On/Off Key is damaged – replace the Frame Main Assy.

3. If the FPC of FPC Side Key is damaged – replace the FPC Side Key.

You can also check a few other things like this one

[image|1030229]

R1304 is a 0.01 Ohm +/-1% 200.0 mW Resistor

Status:

open