Sony KDL-22EX420 Service Manual page 22

Trouble Shooting
3-2-3. 4-times blinking (LED Error)(Not applicable for this manual)
4-times blinking
Check
PANEL_FAIL at
JL6017
on the B* Board
Between 0.84V to 2.65V
Change G* Board
NG
Change LED
Driver Board
Panel
Below 0.84V
B* Board
Symptom
improvement
G* Board
Symptom
improvement
LED Driver Board
KDL- 22 EX423, 26 EX423, 32 EX420, 32, 40, 46 EX523
21
KDL- 22, 26 EX420, 32,40,46 EX520
RM-GD020, CD013
RM-GD020