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Level 3 Repair
8-9
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8-3-2. LCD Working
Power Switch On
LCD FPCB
connector is co
rrectly connecti
ned?
Replace U402 & Check
neighboring circuits
Yes
NO
Yes
LCD
Replace
C421
LED_P_24V=24V?
F400, F401,
F402, HDC400
Resolder
F400, F401,
F402, HDC400
Correctly moun
ted?
NO
correctly connect
NO
LCD Display
On?
Yes
Yes
NO