LG LSS-3200A Service Manual page 43

(C2)
Check tuner output composite signal
(C620) FIG. 08
YES
Check NTSC decoder.
YES
Is there any quantize noise ?
FIG. 08
CVBS signal from TU300
FIG. 10
NTSC Decoder Pixel Clock
When DTV is main
NO
Check tuner block(TU300)
NO
power check; L602 5V
Analog input: IC606 (44)
Reference clock oscillation : X601
FIG. 09
Pixel clock: 13.5MHz continuous
Clock in IC606 (28). FIG. 10
Hsync out: 15.7KHz negative pulse in
IC606 (36). FIG. 11
Vsync out: 59.94Hz negative pulse in
IC606 (35). FIG. 12 top
Field ID : 29.97Hz pulse in IC606 (34).
FIG. 12 bottom
IIC: IC606 (10(SCL), 11(SDA))
NO
Check digital output pin short in IC606
pin 12~ 19, 23~ 26, 30~ 33.
FIG. 11
NTSC Decoder Hsync output
3-34
FIG. 09
X601 Reference clock
FIG. 12
NTSC Decoder Vsync output(top), Field ID(bottom)