LG HDR676X - Tv, External Input Video Signal

3-13
11. NO TV, EXTERNAL INPUT VIDEO SIGNAL
CHECK Cable con-
nection & Input signal
C859, C869, C871:
Is there a signal?
IC 803 pin 21, 22, 25,
26 : Is there a signal?
C926 : Is there a
signal?
CHECK IC 803 pin 2,4 (12V)
Pin 32,33 (SCL/SDA)
Replace IC803
CHECK IC1302
Reset Circuit
CHECK IC901 power
3.3V & 1.8V
IC901 DEFECT
C917,C923,C934 :
Is there a signal ?
C618 : Is there a
signal ?
No video signal of external
input AV3 (Rear RCA input)
No video signal of external
input AV4(Composite/S-Video)
When Cable connecting Tuner and Rear
SCART1,2 No TV video signal (AV1/2)
NO
NO
NO
NO NO
NO
NO
YES
YES
YES
YES
YES
YES
YESYES
YES
IC901 pin 34 Or R999
(reset”H”) :
X901 (24.576MHz)
clock oscillated ?
YES
R962,R978 (I
2
C) :
IC901 pin 108 or
R930 (VI_CLK) :
CHECK No RGB /
Component /
Composite /
S-Video
Signal when play
DISC
YES
YES
YES YES