Ericsson A2618s Troubleshooting Manual page 9

3.3 Consumes less than 15 mA
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.
Power up the board and start it by pressing On/Off key.
Measure the VDIG-voltage on C723, measure on the side close to N700.
If the voltage is incorrect measure that the resistance of C723 (>40 kohms).
If the resistance is correct, send the unit on according to the local company directives.
If the resistance is incorrect then replace C723.
Measure the VCORE.DSP -voltage on C725, measure on the side close to N700.
If the voltage is incorrect, measure the resistance of C725 (>200 kohms).
If the resistance is incorrect, replace C725.
If the resistance is correct, send the unit on according to the local company directives.
If VDIG and VCORE.DSP are correct measure the VDSP-voltage, on N720 pin 5.
If the VDSP-voltage is incorrect, replace N740.
If VCORE.DSP is incorrect after the replacement, measure the resistance of R705
(0.56 ohm), and C740 (>20 kohms).
If the resistance is incorrect, replace R705 and C740.
If the fault still remains, send the unit on according to the local company directives.
3.4 Consumes no current
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.
Make sure X1 not is damaged or incorrectly soldered.
Replace the flex-film.
Power up the board.
Measure the VBATT-voltage on C400, measure on the side closest to the edge
of the board.
If the VBATT-voltage is correct, measure the voltage on pin 2 of V850 2.7 ± 0.10 V
If the voltage is correct, replace V850.
If the voltage is incorrect, send the unit on according to the local company directives.
If the VBATT-voltage on C400 is incorrect, replace X1.
If the fault still remains, send the unit on according to the local company directives.
4/00021-2/FEA 209 544/25 A
Trouble Shooting Guide, Standard
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