Sony KDL-22EX420 Service Manual page 23

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