LG 710B Service Manual page 32

21. User Control Failure
Check connector Ass'y.
IC401 Pins 27 and 28
inputs are right at
each function?
YES
Check and replace IC401.
Done.
Proper Video levels are
on P301 Pin 1, 3 and 5.
YES
Proper AC voltage are
on all cathodes?
YES
Proper DC voltage are
on all cathodes?
YES
G2 voltage is right?
YES
Change the CRT.
NO
22. Missing Color
NO
NO
NO
NO
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Check and replace function key.
Check signal generator and
signal cable.
Refer to 2 No Charcter.
Check and replace IC303
Check C341, C346 and G2 wire.
Check around FBT circuits also.