6-5
3. Checking the Back Light Unit
NG
OK
Check 5V voltage provided of
Smart Power BD CN21 pin 2
and pin 3.
Failure point
Failure point
Inverter Area of Smart
Power BD failure.
Failure point
F101 failure.
Check the ON/FF signal of
equal “H” at CN51 pin6 in Smart
Power BD?
OK
NG
Failure point
Power Area of Smart
Power Board failure.
Is 12V voltage provided from
Smart Power BD ?
Check F101 open.
OK
NG
Smart power BD: Combined board of power and inverter circuits.
1. U405 failure (Main BD)
2. Printed wire or parts broke between U405 pin 41 to CN51 pin 6.