LG LSS-3200A Service Manual page 44

(D)
Check NTSC mute signal is low.
OK
Check HD- II NTSC encoder part.
OK
Check NTSC analog output buffer part
NO
END
FIG. 13
27MHz NTSC encoder pixel clock
NG
Check Q501, Q505, Q506 base
voltage.
Must be low. If not,
check IC201 pin 47
NG
Check NTSC encoder pixel clock:
IC605(7) FIG. 13
YES
Check power:
IC604(8) IC612(8); +5V IC604(4)
IC612(4); –5V
Check composite: FIG. 14 top ,
Input: IC604(3,5) Output: IC604(1,7)
Check S- video: FIG. 14 bottom
Input: IC612(3,5) Output: IC612(1,7)
FIG. 14
Composite Output(top) and Y& C
output (bottom)
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