Trouble Shooting Guide, Standard
4/00021-2/FEA 209 544/31 B
8(23)
3 On/Off Problems
3.1
Type of fault
Make an external visual check of the phone:
Make sure that the battery connectors are intact, clean and fully functional.
Make sure that there is no liquid damage on the system connector. Replace if needed.
Insert a fully charged battery and press the On/Off key.
•
If the phone starts without the On/Off key being pressed, go to section 3.2.
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If the phone starts (lights up the background illumination, asks for SIM/Pin, seeks net…),
check the charging function by connecting a charger to the system connector.
If the charging function is faulty, go to chapter 6 (“Capacity/Charging problems”).
If the charging works, there is probably nothing wrong with the phone or the fault is
intermittent.
•
If the phone does not start, insert a dummy battery and keep the On/Off key pressed.
If the phone consumes more than 50 mA, go to section 3.3.
If the phone consumes 15-30 mA, go to section 3.4.
If the phone consumes less than 15 mA, go to section 3.5.
•
If the phone turns off after a few seconds, go to section 3.6.
3.2
Starts immediately after inserting a battery
Open the phone and check for liquid damage.
Replace the dome foil. Make sure that the keypads are clean before mounting a new one.
If the fault remains, send the unit on according to the local company directives.
3.3
Consumes more than 50mA
Open the phone and check for liquid damage.
Power up the board and press the On/Off key.
Measure the voltage on V500, on the pin close to C401 (4.7 V).
If the voltage is 3.8 V on both sides, replace V500.
If the fault remains, send the unit on according to the local company directives.
3.4
Consumes 15-30mA
Open the phone and check for liquid damage.
Try to program the phone in the flash programmer.
If programming the phone is impossible, measure the resistance over C615 (>50 kohms).
