LG KG70c Service Manual page 39

KG70C
Checking Flow Checking Flow
START START
Is the power supplied Is the power supplied
to main board normal? to main board normal?
Yes Yes
Check the connection between CON 1101 and CON 2101 Check the connection between CON 1101 and CON 2101
AND between CON 2100 and CON 300 AND between CON 2100 and CON 300
Is the connection Is the connection
OK? OK?
The voltage at plus point The voltage at plus point
of C 310=2.85V? of C 310=2.85V?
Yes Yes
Check the input signal Check the input signal
of EMI filter(F300~304) of EMI filter(F300~304)
Is the input signal normal? Is the input signal normal?
Yes Yes
Check the output signal Check the output signal
of EMI filter(F300~304) of EMI filter(F300~304)
Is the output signal normal? Is the output signal normal?
Yes Yes
LCD display ? LCD display ? LCD display ?
Yes Yes
Good Good Good
No No
No No
Yes Yes
No No
No No
No No
No No
Refer Refer
to [1] to [1]
Connect again Connect again
rightly! rightly!
Change the U400 Change the U400
Change the U702 Change the U702
Re-solder F300, F301, F302, F303, F304 Re-solder F300, F301, F302, F303, F304
Change LCD Change LCD
Yes Yes
38
LCD display ? LCD display ? LCD display ?
No No
Change main board Change main board