Sony KDL-32R400A / KDL-32R420A / KDL-40R450A / KDL-40R470A / KDL-46R450A / KDL-46R470A Service Manual ▷ View online
21
SEC 3. TROUBLE SHOOTING
No power
Check SB_3.3V
at 1 pin of CN201
on the Main board
Between 3.14~3.45V
Harness issue
Change
PSU
Replace the harness
between PSU and
Main board
Change
Main board
NG
OK
NG
Symptom
improvement
Long AC off(> 15 min.)
and then
Power On
Enter Service Mode and check
Self diagnosis history
NG
OK
Check the harness
PSU to M/B
connection
NG
OK
Fix the harness
connection
IF MAIN_POWER > 0 or
DC_ALERT1 > 0
IF AUDIO_PROT > 0
BACKLIGHT_ERR > 0
Change
Main board
Change
Panel
Change
Main board
OK
No
No
Yes
Yes
Yes
3-1. NO POWER
KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
22
1) 2 times blinking (Main Power Error)
TROUBLE SHOOTING
3-2. STANDBY LED BLINK
Harness issue
Change
PSU
OK
Symptom
improvement
<2.6V
Change
Main board
Change
Main board
2-time blinking
Check REG+12V at
CN201_Pin-3/8 on
Main board
(11.8~13.2V)
Replace the harness
between PSU and
Main board
NG
NG
Check PSU_EN# at
CN201_Pin-6 on
Main board
>=2.6V
Check the harness
PSU to M/B
connection
NG
OK
Fix the harness
connection
OK
KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
23
TROUBLE SHOOTING
2) 3 times blinking (Main Board Error)
3-time blinking
Check PWM_5V at
L202 pin-2 on Main board
(4.75~5.25V)
U202, L202, etc
Change Main board
Change Speaker
Check SYS_3.3V
at U204_Pin-6
on Main Board
(3.135~3.465V)
Check the speaker
Impedance at the
SP Connector
(8ohm+/-15%)
U204, etc
Change Main board
Demo, Audio, Tuner, etc
Change Main board
DC_ALERT
NG
OK
NG
OK
AUDIO
NG
OK
Check the harness
M/B to Speaker
connection
NG
OK
Fix the harness
connection
24
TROUBLE SHOOTING
3) 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-32R400A/420A, 40R450A/470A, 46R450A/470A(PA)
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