Ericsson R310s Troubleshooting Manual page 10

Trouble Shooting Guide, Standard
3.6 Turns off after a few seconds
Open the phone and check for liquid damage.
Power up the board and start it by pressing the On/Off key.
Measure the VDIG voltage on C703, on the pin close to R706 (2.7 V)
If the voltage is incorrect, measure that the resistance of C703 is more than 150 kohms.
If the resistance is correct, send the unit on according to the local company directives.
If the resistance is incorrect, replace C703.
Measure the VCORE voltage at C702, on the pin close to R428 (2.5 V).
If the voltage is incorrect measure the resistance of C702 (>200 kohms).
If the resistance is correct, send the unit on according to the local company directives.
If the resistance is incorrect, replace C702.
Measure the VDSPC voltage on N740 pin 5 (1.8 V).
If the voltage is incorrect, replace N740.
If VDSPC is incorrect after the replacement, measure the resistance of C740 (>20 kohms).
Replace C740 if it is incorrect.
If the fault remains, send the unit on according to the local company directives.
4/00021-2/FEA 209 544/31 B 10(23)