47
LC-45GD5U
TROUBLE SHOOTING TABLE
(Continued)
<Composite video signal> input
No video output (1)
NO
No video output from external input <<INPUT
-1>>
Is INPUT
-1 selected in the input switching menu
screen?
When it cannot be selected since the characters
INPUT
-1 on the menu screen are gray
.
Select INPUT
-1 and the input signal in the input
switching menu screen.
Is video signal detection functioning normally?
Check between pin 1
1
of J1
101 and pin 70 of
IC3800.
YES
NO
Is video signal supplied to pin 65 of IC3800 (A
V
SWITCH)?
YES
Check between pin 8 of J1
101 and pin 65 of
IC3800.
Is video signal sent to pin 60 of IC3800?
NO
No video output from external input <<INPU-2>>
Is INPUT
-2 selected in the input switching menu
screen?
When it cannot be selected since the characters
INPUT
-2 on the menu screen are gray
.
Select INPUT
-2 and the input signal in the input
switching menu screen.
Is video signal detection functioning normally?
Check between pin 10 of J1
101 and pin 76 of
IC3800.
YES
YES
NO
NO
Is video signal supplied to pin 71 of IC3800 (A
V
SWITCH)?
Check between pin 9 of J1
101 and pin 71 of
IC3800.
Check IC3800 (A
V SWITCH) and its peripheral
circuits.
YES
Is video signal supplied to pin 1 of IC3807 (MUL
TI_PLEXER)?
NO
Check between IC3800 and IC3807.
(Q3807, etc.)
YES
Is video signal sent to pin 20 of IC3807 (MUL
TI_PLEXER)?
NO
Are control signals supplied to pins 3 and 22 of
IC3807?
YES
Is video signal sent to pin 22 of
A
V_UNIT
connector (PB_P5404)?
NO
Check between IC3807 and P5404.
(Q3803, Q3808, etc.)
YES
Is video signal supplied to pin 22 of MAIN_UNIT
connector (PB_CN1800)?
NO
Check the FFC harness "PB".
YES
Is video signal supplied to pin 2 of IC402 (L.P
.F) via buf
fer Q404?
NO
Check between connector PB and IC402.
(Q404, etc.)
YES
Is video signal supplied to pin 135 of IC400 (3D-YC & CHROMA) via buf
fer Q408?
NO
Check between pins 28 and 27 of IC402 and pin
135 of IC400.
YES
Are digital video signals sent from output terminals of IC400?
NO
Check IC400 and its peripheral circuits.
