LG RT-44NA10T Service Manual page 22

7. NO VFD OPERATION
Check AV Board IC750 #5
Sound signal.
YES
Check IC750 #3 output
YES
Check IC001 #18, 21, 22
YES
Check IC001 #23, 25, 27
(OPTION)
NO
NO
NO
NO
Check IC701sound output
Check around IC750
Check Q008, 007
Check Q011, Q012
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