LG HW300Y Service Manual page 29

4. Trouble shooting - No video (AV)
Check input signal format.
Is it supported?
ok
Check AV Cable for damage
for damage or open conductor
ok
Check BCM Out signal line or DPP6401 Signal line
With internal pattern
ok
Check JK902 CVBS Signal Line
1.R904, C903
ok
Check CVBS_DET Signal
1.R911
ok
Replace BCM3549(IC10) or Main Board.
Copyright © 2011 LG Electronics Inc. All rights reserved.
Only for training and service purposes
No
1.Resolder R904, C903
No
1.Replace R911
LGE Internal Use Only