39
LC-37D40U
LC-45D40U
TROUBLESHOOTING TABLE
(Continued)
<Composite video signal/S-video signal input>
No video output (2)
No video output during digital broadcasting reception
No video output from external input
〈〈
INPUT-3
〉〉
<Composite video signal input> Is video signal sent to pin 60 of IC501?
<S-video signal input> Are Y and C signals sent to pins 60 and 59 of IC501 respectively?
<Composite video signal input> Is video signal sent to pin 2 of IF_UNIT connector (FC_SC501)?
<S-video signal input> Are Y and C signals sent to pins 2 and 4 of IF_UNIT connector (FC_SC501) respectively?
<Composite video signal input> Is video signal fed to pin 2 of MAIN_UNIT connector (FC_SC1101)?
S-video signal input> Are Y and C signals fed to pins 2 and 4 of MAIN_UNIT connector (FD_SC1101) respectively?
<Composite video signal input> Is video signal fed to pin 242 of IC3301(Trident) via L.P.F. composed of Q2201 and Q2207?
Are digital video (LVDS) signals sent from pins 28-31 and 34-37 of IC3301?
Check IC3301 and peripheral circuits.
Check LCD_CONTROL PWB.
Is INPUT-3 selected on the input switching
menu screen?
Check IC501 (AV SWITCH) and
peripheral circuits.
Is control signal for level adjustment fed
from pin 1 of IC1104 to pin 6 of IC1103?
Is the video signal detection function normal? Check between pin 2 of J501and pin 2 of IC501.
Select INPUT-3 and the input signal on
the input switching menu screen.
Check or replace IC1104 (CONTROL) and
peripheral circuits.
Check between pins 3 and 4 of J503 and
pins 5 and 7 of IC501.
Check between SC1101and IC3301.
(Q2201, Q2207, etc.)/
(Q2205, Q2209, etc.)
<S-video signal input> Are Y and C signals fed to pins 242 and 231 of IC3301(Trident) via L.P.F. composed of Q2201 and Q2207 an
d via L.P.F.
composed of Q2205 and Q2209 respectively?
Check between IC501 and SC501.
(Q501, Q502, Q503, Q504, etc.)
Check the board-to-board cable "FC".
Is the S-video signal detection function
normal?
Check between pin 6 of J503 and pin 6 of
IC501.
Check between IC1103 and IC3301.
(Q2204 ,Q2208, etc.)
Check between pin 1 of J501 and pin 3 of
IC501.
Is video signal sent to output terminal pin
4 of tuner (TU1101)?
Check or replace the tuner's peripheral
circuits.
When INPUT-3 cannot be selected since
the characters INPUT-3 on the menu
screen are gray.
Is video signal fed to pin 7 of IC1103
(LEVEL ADJ)?
Is video signal fed to pin 244 of IC3301 (Trident) via L.P.F. composed of Q2204 and Q2208?
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Is signal fed to each input terminal of
IC501 (AV SWITCH)?
<Composite video signal input>
Is video signal fed to pin 3 of IC501?
<S-video signal input>
Are Y and C signals fed to pins 5 and 7 of
IC501 respectively?
Summary of Contents for Aquos LC 45D40U
Page 45: ...45 LC 37D40U LC 45D40U M E M O ...
Page 53: ...6 5 4 3 2 1 A B C D E F G H 60 LC 37D40U LC 45D40U IF Unit Side A ...
Page 56: ...6 5 4 3 2 1 A B C D E F G H 63 LC 37D40U LC 45D40U AC INLET Unit LC 45D40U Only KEY Unit ...
Page 72: ...79 LC 37D40U LC 45D40U M E M O ...
Page 80: ...87 LC 37D40U LC 45D40U ...
Page 109: ...6 5 4 3 2 1 A B C D E F G H 142 LC 37D40U LC 45D40U LED Unit ...
Page 110: ...6 5 4 3 2 1 A B C D E F G H 143 LC 37D40U LC 45D40U KEY Unit ...
