Samsung SCH-A101 Service Manual page 24

Troubleshooting
6-1-3 Abnormal Backlight,LCD or LED Operation
Press and button on the phone
'H' level output from
U104 pin 7L?
from U101 pin7L drive
Q107 & Q108?
'L' level from U104 pin13p?
Backligh LED or LCD on
Yes
'H' level
Yes
Yes
SAMSUNG Proprietary-Contents may change without notice
Check U104 pin7L
No
Replace if required
Check Q107 & Q108 and its
neighboring circuits.
No
Replace if required
Check U104 pin 13p
No
6-3