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Troubleshooting
6-1-3 Abnormal Backlight Operation
Press and button on the phone
'H' level output from
U104 pin 7L?
'H' level input from
U104 pin7L drive U209?
The voltage applied to
LCD(U207) pins31?
Yes
Yes
Yes
Backlight
LED on
SAMSUNG Proprietary-Contents may change without notice
Check U104 pin7L.
No
Replace if required.
Check U209 and its
neighboring circuits.
No
Replace if required
Check Q206, L202
No
and its neighboring circuits.
6-3
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