Samsung SCH-A302 Service Manual page 6

2. SCH-A302 Trouble Shooting
1. Logic Section
1-1. No Power
Press PWR button
U501 pin38 Input=HIGH
U501 pin6 & pin10
output=2.8 V?
U501 pin39
Input=HIGH?
Y
Y
Y
END
SAMSUNG Proprietary-Contents may change without notice
Check Q507, Q509 and its
N
neighboring circuits
Check U501 pin6 & pin10 and its
N
neighboring circuits
Check R536 and its neighboring
N
2-1
circuits