Sony KDL-32R400A / KDL-32R420A / KDL-40R450A / KDL-40R470A / KDL-46R450A / KDL-46R470A Service Manual ▷ View online
25
TROUBLE SHOOTING
3-3. NO PICTURE
KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
No picture
Press HOME Key.
Menu displayed?
Change Equipment
Or Player to check
TV display
No
Yes
Replace the
FFC(LVDS) Between
PSU and Panel
FFC(LVDS) issue
NG
Replace
PSU to Panel
Harness
Harness issue
Change
Main board
NG
NG
PSU issue
Change
Panel
Change PSU
NG
OK
OK
Symptom
improvement
Symptom
improvement
Main board issue
Check the harness
PSU to Panel
connection
NG
OK
Fix the harness
connection
Check the FFC(LVDS)
PSU to Panel
connection
NG
OK
Fix the FFC(LVDS)
connection
Change
Main board
No display
Signal or Equipment
Problem
OK
OK
OK
KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
26
TROUBLE SHOOTING
3-4. NO SOUND
No Sound
Change the speaker
harness
Speaker Harness
issue
Replace
Main board
Main board issue
Change
Speaker
NG
NG
Check the
“Speakers setting”
Change to
“TV Speaker”
“Audio System”
“TV Speakers”
Symptom
improvement
Symptom
improvement
Check if TV is
set to Mute
Yes
No
Change to
Un-mute
OK
OK
27
3-5. TV COMMANDER BUTTONS MALFUNCTION
TROUBLE SHOOTING
1) TV button malfunction
KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
Button malfunction
on the TV
Replace the harness
between Main board
and Key module
Key module issue
Harness issue
Change
Key module
Change
Main board
NG
NG
Symptom
improvement
Symptom
improvement
OK
OK
28
TROUBLE SHOOTING
2) IR remote commander malfunction
KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
TV isn’t controlled
by remote commander
OK
NG
Green LED light
at power indicator
Change Main board to
IR board FFC
IR FFC
issue
NG
Green LED blinks at power indicator
when using commander
near sensor’s window
OK
NG
Change
Main board
NG
Change IR board
IR board issue
Change
Remote Control
battery
Symptom
improvement
Symptom
improvement
OK
OK
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