LG LST-4200A Service Manual - Page 38

Fig.06 - tuner

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In the case of (C2) _ NTSC, NG Check tuner output composite signal(C300). OK NG Check NTSC decoder. NO Is analog component on the Mute NO mode? NO Is analog component on the Mute mode? Check tuner block(TU300) • power check; L300 5V Analog input: IC301(44) • Reference clock oscillation : X300 • Pixel clock: 13.5MHz continuous Clock in IC301 (28). • Hsync out: 15.7KHz negative pulse in IC301 (36). • Vsync out: 59.94Hz negative pulse in IC301 (35). • Field ID :29.97Hz pulse in IC301 (34). • IC: IC301 (10(SCL), 11(SDA)) Check digital output pin short at the IC301 pin 12~19, 23~26, 30~33. Fig.06 CVBS signal coming from IC500 3-29

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3-29
Check tuner output composite sig-
nal(C300). <FIG.08>
Check tuner block(TU300)
Check digital output pin short at the
IC301 pin 12~19, 23~26, 30~33.
•
power check; L300 5V Analog input:
IC301(44)
•
Reference clock oscillation :
X300 <FIG.09>
•
Pixel clock: 13.5MHz continuous
Clock in IC301 (28). <FIG.10>
•
Hsync out: 15.7KHz negative pulse
in IC301 (36). <FIG.11>
•
Vsync out: 59.94Hz negative pulse
in IC301 (35). <FIG.12 top>
•
Field ID :29.97Hz pulse in IC301
(34). <FIG.12 bottom>
•
IC: IC301 (10(SCL), 11(SDA))
Check NTSC decoder.
Is analog component on the Mute
mode?
Is analog component on the Mute
mode?
In the case of (C2) _ NTSC,
OK
OK
NO
NO
NG
NG
NO
Fig.06
CVBS signal coming from IC500