Sony KDL-32R420A Service Manual page 24

3) 6 times blinking (Backlight Error)
6-time blinking
Check PSU_BL_EN#
at CN201_Pin-14
on the Main board
>=2.4V
Check PSU_BL_ERR#
at CN201_Pin-13
on the Main board
>=1.8V
Check the harness
PSU to M/B
connection
OK
Replace the harness
PSU to Main board
NG
KDL-32R420A/421A/423A/424A, 40R470A/471A/473A/474A, 46R470A/473A(AEP/UK)
<2.4V
Change
Main board
<=0.7V
Change
Main board
NG
Fix the harness
connection
Symptom
improvement
Harness issue
OK
Check the FFC(LVDS)
NG
Between Fix the FFC(LVDS)
PSU and Panel
connection
OK
Replace the
OK
FFC(LVDS) Between
PSU and Panel
NG
OK
Replace PSU
NG
Change
Panel
TROUBLE SHOOTING
connection
FFC(LVDS)
issue
PSU issue
24