Read Sony KDL-32R420A / KDL-32R421A / KDL-32R423A / KDL-32R424A / KDL-40R470A / KDL-40R471A / KDL-40R473A / KDL-40R474A / KDL-46R470A / KDL-46R473A Service Manual 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
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-32R420A/421A/423A/424A, 40R470A/471A/473A/474A, 46R470A/473A(AEP/UK)
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