LG PT-53A83T Service Manual page 23

7. NO VFD OPERATION (Option)
Check AV Board IC205 #5
Sound signal.
YES
Check IC205 #3 output
YES
Check IC001 #45,46
YES
Check IC001 #47,48,49
NO
Check IC205sound output
NO
Check around IC205
NO
Check Q008, 007
NO
Check Q011, Q012
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