Tv, External Input Video Signal - LG DR1F9H Service Manual

11. NO TV, EXTERNAL INPUT VIDEO SIGNAL
CHECK Cable con-
nection & Input signal
NO
No video signal of external
input AV3 (Rear RCA input)
YES
C618 :
Is there a signal ?
YES
CHECK Cable con-
nection & Input signal
NO
No video signal of external input
AV4 (Composite / S-Video)
YES
C917,C923,C934 :
Is there a signal ?
YES
IC901 pin 34
Or R999 (reset"H") :
YES
X901 (24.576MHz)
clock oscillated?
YES
R962, R978 (I 2 C) :
YES
IC901 pin 108 or
R930 (VI_CLK) :
YES
CHECK No RGB / Component / Composite
/ S-Video Signal when play DISC
CHECK Cable con-
nection & Input signal
NO
When Cable connecting Tuner and Rear
SCART1, 2 No TV video signal (AV1/2)
YES
C859, C869, C871 :
Is there a signal?
YES
IC803 pin 21, 22, 25,
26 : Is there a signal?
YES
C926 : Is there a
signal?
YES
NO
CHECK
IC1302 Reset Circuit
NO
CHECK IC901 power
3.3V & 1.8V
YES
IC901 DEFECT
3-18
NO
CHECK IC 803 pin 2,4 (12V)
Pin 32,33 (SCL/SDA)
YES
Replace IC803