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8-1-3 Abnormal Backlight Operation
Press any button on the phone.
'H' level outputted
from U100 pin 60?
'H' level
from U100 pin 60 drive Q140
through R144?
Normal Q141 operation?
The voltage applied
to LCD pins 38, 41?
Backlight LED on
Samsung Electronics
N
Y
N
Y
N
Y
N
Y
Check U100 pin 60. Replace if required.
Check R142, R144, and Q140.
Replace if required.
Check R146, R147, R148 and
Q141. Replace if required.
Resolder R141 and R142.
Troubleshooting
8-3
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