Copyright © 2008 LG Electronics. Inc. All right reserved. 36 LGE Internal Use Only
Only for training and service purposes
36
5.3 Tuner Input shows “No Signal”
At tuner mode(Air, Cable), if “No Signal” happens, check TV cable first. If cable signal is good, please follow the
steps below.
Tuner +5V
Check U9062
+9V & +5V
Check U9008
+9V & +14V
Check Q8019
& Power Board
Check Path and
Tuner Pin 16 (CVBS)
Check C9056
(CVBS)
Check I2C
Check IF AGC &
Tuner IF (D_IF)
Check C33 &
C34 (D_IF)
Change Tuner
Change Zoran 780
5.4 Component 1, Component 2, AV1 and AV2 Inputs show “No Signal”
At Component or Composite mode, if “No Signal” happens, please follow the steps below.
Make Sure Signal Generator Is OK
Component Input Composite Input
Check U17 Vcc &
Signal Path
Check Path from
U17 to U1
Check Path from
connector to U1
Download Firmware Again
Change U1
To Next Page
Loading...
