Samsung HG43NT678UF Service Manual page 55

4. Troubleshooting
„ Extended Version
Power TV On
1
If voltage error or no
2
change ?
If OK ?
3
If any wrong voltages ?
4
4-8
PIN (Power On/Off).2Vdc (when off) changes to 3.3Vdc (on)
9 8
– There is a delay from PS-ON to off condition when the TV is
powered off.
GND
2
1
A13V
3 4
A13V
5 6
A13V
8
7
A13V
9 10
GND
11 12
Check Jog Function Control Test
9
Replace Main Board
9
– Check All A13V supplies (12.7VDC) (PIN 3579)
GND
1 2
A13V
3 4
A13V
5 6
A13V 8
7
A13V
9 10
GND
11 12
Remove SMPS connector to Main Board
9
– Check All A13V supplies (12.7VDC) (PIN 3579)
If voltages are now OK?
Replace the Main Board
9
CNM801
ANA-DIM
OD ON/OFF
BLU_PWM
Power_On/Off
GND
GND
CNM801
ANA-DIM
OD ON/OFF
BLU_PWM
Power_On/Off
GND
GND
If voltages are still wrong ?
Replace SMPS
9