LG HCS6000A Service Manual page 30

(D)
OK
Check NTSC mute signal is low.
OK
Check HD-II NTSC encoder part.
NO
Check NTSC analog output buffer part
NG
NG
Check NTSC encoder pixel clock: IC605(7)
FIG.13
YES
Check power:
IC604(8) IC612(8); +5V IC604(4) ; –5V
Check composite: FIG.14 top,
Input: IC604(3,5) Output: IC604(1,7)
3-20
Check Q501 base voltage.
Must be low.
If not, check IC201 pin 47