5-3
Trouble shooting
5-1-3 Abnormal Backlight Operation
Press any button on the phone
END
'H' level to IC 1 pin 5
on the LOC Board
Check IC 1, CN1 and neighboring circuits.
Replace if required.
NO
NO
NO
NO
YES
YES
YES
YES
'H' level outputted
from U100 pin J4?
Check R283, C244, U100. Replace if required.
NO
NO
NO
NO
YES
YES
YES
YES
