Samsung UN40KU630DF Service Manual page 104

4. Troubleshooting
SMPS POWER
„
1. Power TV On.
PS_ON . 2Vdc (when off) changes to 3.3Vdc (on)
√
May already be On if IoT USB is loaded or TV Smart Things Hub mode is active.
-
2.
if voltage error or no change.
√ Jog Function Control Test.
3. If OK replace Main Board.
√ All A13V supplies to full voltage level 12.7VDC.
4. If any wrong voltage, remove the SMPS connector to Main Board.
√ A13V again for 12.7VDC.
5. If OK replace Main Board.
6. If still wrong voltage replace SMPS.
OD
√ (Over Voltage Detect) : 3.3Vdc (Operating Normal)
7. If 0V or changing, an SMPS or Panel error exists. Perform Backlight Test.
√ BLU_PWM 0V- Off to approx 1 – 3.3 V pending Backlight dim level
√ If missing/error replace
1 2+
2 NC
3 NC
4 2-
5 NC
6 NC
7 NC
8 NC
1 Fail Count
2 ANA-DIM
3 A13V
4 OD_ON/OFF
5 A13V
6 BLU_PWM
4-4
Main Board.
CNL802
9 1+
10 NC
11 NC
12 1-
13 NC
14 NC
15 IF2
16 IF1
CNM803
7 A13V
8 POWER_ON/OFF
9 A13V
10 GND
11 GND
12 GND
Fuse
CNL802
CNM803