No Tv, External Input Video Signal - LG RH188H Service Manual

11. NO TV, EXTERNAL INPUT VIDEO SIGNAL

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