Samsung HG43NT678UF Service Manual page 56

Verify Backlight Turns On
5
If No Backlight ?
Check BLU_PWN (PIN 6) Backlight On/Off & Dim Controls
9
– For approx. 1Vdc – 2.5Vdc depending on backlight dimming
level.
GND
1 2
A13V
3 4
A13V 6
5
A13V 8
7
A13V
9 10
GND
11 12
If missing/Error ?
Replace the Main Board
9
4. Troubleshooting
CNM801
ANA-DIM
OD ON/OFF
BLU_PWM
Power_On/Off
GND
GND
If OK ?
Perform backlight test
9
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