Troubleshooting - Samsung SCH-A105 Service Manual

6. Troubleshooting

6-1 Logic Section
6-1-1 Power Failure
Press & hold
Q110 Drain='H'?
U104 pin9p='H'?
Q104 collector='L'?
U201 pin 1 output
=3.0V?
END/ button
No
Yes
Yes
No
No
Yes
No
Yes
END
SAMSUNG Proprietary-Contents may change without notice
Check the signal path from the battery
terminal to Q110 source, R185,
R115 & Q102.
Check U105, R188, C165 & R112
and its neighboring circuits.
Check Q104 and its neighboring
circuits.
Check U201 and its neighboring
circuits.
6-1