Sony KDL-50R550A / KDL-60R520A / KDL-60R550A / KDL-70R550A (serv.man2) Service Manual ▷ View online
33
TROUBLE SHOOTING
3) 5 times blinking (T-Con Error)
KDL-50R550A, 60R520A/550A, 70R550A(PA)
5-time blinking
Check LVDS_VCC
at TP4010
on the Main board
Change
T-CON
Replace the
FFC(LVDS) Between
PSU and Panel
OK
FFC(LVDS)
issue
Check PANEL_EN#
at U4006_pin6
on the Main board
<=2V
>=2V
NG
<11.4V
>=11.4V
Change
Main board
Change
Main board
Check the FFC(LVDS)
Between
PSU and Panel
connection
NG
OK
Fix the FFC(LVDS)
connection
Change
Panel
T-CON
issue
OK
NG
34
TROUBLE SHOOTING
4) 6 times blinking (Backlight Error)
6-time blinking
Check PSU_BL_EN#
at CN201_Pin-14
on the Main board
Harness issue
NG
Symptom
improvement
Replace the harness
PSU to Main board
Change
Panel
Replace the
FFC(LVDS) Between
PSU and Panel
OK
FFC(LVDS)
issue
Check PSU_BL_ERR#
at CN201_Pin-13
on the Main board
<=0.7V
>=1.8V
NG
Replace PSU
OK
PSU issue
NG
<2.4V
>=2.4V
Change
Main board
Change
Main board
Check the harness
PSU to M/B
connection
NG
OK
Fix the harness
connection
Check the FFC(LVDS)
Between
PSU and Panel
connection
NG
OK
Fix the FFC(LVDS)
connection
OK
KDL-50R550A, 60R520A/550A, 70R550A(PA)
35
TROUBLE SHOOTING
3-3. NO PICTURE
KDL-50R550A, 60R520A/550A, 70R550A(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-50R550A, 60R520A/550A, 70R550A(PA)
36
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
Click on the first or last page to see other KDL-50R550A / KDL-60R520A / KDL-60R550A / KDL-70R550A (serv.man2) service manuals if exist.