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6-3
Troubleshooting
6-1-3 Abnormal Backlight Operation
Press and button on the phone
‘H’ level output from
U101 L7 to J105 pin 19?
‘H’ level input to
U139 pin 4,5?
Normal U139 operation?
Normal EL?
EL ON
Check EL.
Replace if required
Check U139, L201, Q139
and its neighboring circuits.
Replace if required
Check FPC.
Replace if required
Check U101 L7.
Replace if required
Yes
No
Yes
No
Yes
No
Yes
No