On/Off Problems - Ericsson A2618s Troubleshooting Manual

3 On/Off Problems

Make sure the battery connector is intact, clean and fully functional.
Measure the resistance from VBATT to ground on X1:1.
It should be more than 20 kohms. If it is less, usually only a few ohms there is probably a
shortcut in N400.
Replace it if needed.
Make sure there is no liquid damage at the system connector.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
Insert a correct battery and press the On/Off key.
If the unit starts without the On/Off key being pressed, go to section 3.1.
If the unit starts, check the charging function by connecting a charger to the system connector.
If the charging function is faulty, go to chapter 6 ("Capacity/Charging problem").
If the unit starts (lights up the background illumination, asks for SIM/Pin, seeks net...)
there is probably nothing wrong with the unit or the fault is intermittent.
If the unit does not start, connect a dummy battery to the power-supply with an Ampere-
meter, and keep the On/Off key pressed.
If the unit consumes 15-30mA, go to section 3.2.
If the unit consumes less than 15mA, go to section 3.3.
If the unit consumes 0 mA, go to section 3.4.
3.1 Starts immediately after connecting a battery
Open the unit and check for liquid damage.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
Replace the flex-film.
If the fault remains, send the unit on according to the local company directives.
3.2 Consumes 15-30 mA
Try to flash the unit.
If the fault remains, open the unit and check for liquid damage.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
If it is impossible to flash the unit, measure the resistance of R601 (10 kohms).
If the resistance is incorrect, replace R601.
If the resistance is correct make sure that the resistance of C603 is more than 40 kohms.
If the resistance of C603 is less, replace V801.
If that does not help, replace C603.
If the resistance is correct, and it still is impossible to flash the unit, send the unit on
according to the local company directives.
4/00021-2/FEA 209 544/25 A
Trouble Shooting Guide, Standard
8(24)