LG 50PG6300 Service Manual page 31

15. No Sound – Analog TV Input
- Check the condition of the RF cable connection.
- Check the system clock (27MHZ,Y171) and the Voltage of VCTP_P(U81)
Copyrightⓒ2008 LG Electronics. Inc. All right reserved
Only for training and service purposes
No Sound
Pass
Repeat C Process
Pass
Check the signal(SIF) of R669
Pass
Repeat D Process
Pass
Check input source cable or Tuner(U661)
Fail
­31­
Re-soldering or Change the
defect part(U661)
LGE Internal Use Only