Samsung QN49Q6FNAF Service Manual page 60

4. Troubleshooting
• 75 inches
1 GND 2
7 A13V 8
13 A13V 14 BLU_ON/OFF
19 GND 20
Backlight
1. Power TV On
POWER ON .2Vdc (when off) changes to 3.3Vdc (on)
9
NOTE
• Will stay On for short time when powered off.
2. If voltage error or no change:
Jog Function Control Test
9
3. If OK replace Main Board
All A13V supplies for approx. 12.7VDC
9
See (SMPS label for approx. STBY and On voltage)
9
4. If any wrong voltages, remove SMPS connector to Main Board
All A13V again for 12.7VDC
9
5. If OK replace Main Board
6. If still wrong voltage replace
OVD_LEVEL (Over Voltage Detect) 3.3Vdc : Operating Normal
9
7. If 0V or changing, an SMPS or Panel error exists. Perform Backlight Test.
Backlight On/Off :
9
• If missing or error - Replace
4-8
Main Connector (POWER)
CNM801 (MAIN Connector)
GND 3
OVD LEVEL 9 FAIL DETECT
15
GND
SMPS
0V : Off to 4.4Vdc : ON
Main Board.
CNM801
GND 4 1-wire PWM
10 ANA-DIM
A13V 16 Power ON/OFF 17
Power
5 A13V 6
11 A13V 12
A13V 18
GND
OD ON/OFF
GND