LG HCS6000A Service Manual page 26

(B)
YES
Check analog component mute ON?
YES
Check analog buffers.
IC604 for composite out.
IC609 for component YPbPr,
IC610 for RGB analog out
YES
Jump to (A) flow
(C1)
YES
Check input stream existence.
Any problem?
YES
Any decoding problem?
YES
End
NO
NO
When DTV is main
NO
Digital Stream Input Check (IC400) FIG.06.
Check VSB/QAM tuner (TU300) block.
NO
Check HD 2 chip Interrupt request signal
(R418) FIG.07
3-16
No OSD is not a problem.
Check DVI output.
Check A5V(L603) & A-5V(L604) are
supplied.
Check signal strength.
If OK, check system clock 27MHz.
VSB/QAM: IC600(9)
YES