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