LG LHB976 Service Manual page 119

MAIN SET TROUBLESHOOTING
1-4. NO CVBS VIDEO OUTPUT
No CVBS video on display
YES
Is there
CVBS signal on
R2A8?
YES
Is there
CVBS signal out of IC250
pin6?
YES
Is there
signal on
CA203?
YES
Check JK251 and RCA cable connection.
NO
Check IC251 signal or Vcc.
NO
Replace IC250.
NO
Check R567.
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