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Flow Chart of Troubleshooting
9-3
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9-1-2. LCD Working
Power Switch On
LCD FPCB
connector is co
rrectly connecti
ng?
Yes
Replace U707 & Check
neighboring circuits
Yes
NO
Yes
UCP400
Replace
U709
Replace
NO
Yes
LCD
Replace
C714
LED+_23V= 23V?
U709
3rd pin LCD_EN
= High?
NO
Yes
C718
VLCD_3.0V =3.0
V?
F803, F804, F805
Resolder
NO
F803, F804,
F805 Correctly
mounted?
NO
correctly connect
Yes
NO
LCD Display
On?
Summary of Contents for GT-B7320L
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