I have a samsung led tv model number UN55D7000LF when I plug it into the outlet it power cycles on & off, the smart screen comes on & it shuts right back off & just keeps going over & over again. I've read every forum on here for the past two weeks I could find that was related to this TV & or the power supply tried a couple different things but non of them work. It was all a waste of time since the volt readings I took when I started is right where I'm still at here are the reading off the power supply on the 3 different connectors hopefully one of you guy's can help me out. I'm thinking the problem could be in the led lights cause of the readings i'm getting but I don't want to take the T.V. apart if I don't have to. Kinda hoping it's just a bad power supply.
So the only thing that stopped this cycling is when I unplugged the power supply from the main board. These readings are from the power supply unplugged from the main board. Also got you guy's pictures of the two boards and everything together.
Power supply number is BN44-00428A
Also no back lights when the main is unplugged from the power supply.
CNL802A
1. L2+ 0
2. L6+ 56
3. L2- 0
4. L6- 23
5. L1+ 0
6. L5+ 23
7. L1- 0
8. L5- 0
9. BLANK
10. BLANK
11. L8+ 33-45
12. L4+ 33-45
13. L8- 3-15
14. L4- 3-15
15. L7+ 23
16. L3+ 23
17. L7- 0
18. L3- 0
19.
20.
21.
22.
CNL802B
1. R7+ 124
2. R3+ 124
3. R7- 90
4. R3- 90
5. R8+ 90
6. R4+ 90
7. R8- 55.9
8. R4- 55.9
9. BLANK
10. BLANK
11. R1+ 124
12. R5+ 124
13. R1- 0
14. R5- 90
15. R2+ 0
16. R6+ 90
17 R2- 0
18 R6- 56
CNM803
1. OD LEVEL 5.1 1.2-5
2. P_DIM 4 0
3. OD ON/OFF 4.9 1.2-4
4. P_DIM 3 0
5. GND
6. P_DIM 2 0
7. B13V 12.6 1.2-10
8. P_DIM 1 0
9. B13V 12.6 1.2-10
10. B13V 12 1-10
11. VAMP 16.9 .9-13
12. BLU ON/OFF 4.5 1.1-4
13. VAMP 16.9 1-13
14. GND
15. GND
16. GND
17. B5V 5.2 1.3-5.2
18. A5V 5.2 stays the same
19. B5V 5.2 1.2-4.8
20. POWER ON/OFF 3.0 stays the same
21. N.C.
22. N.C.
Now on CNM803 on the right is readings I get after the power supply is plugged into the main board for a minute then unplugged last this way for about 2-5 minutes then goes back to regular readings. I also get these readings sometimes right when I plug in the power supply for the first time even without plugging it into the main board. I don't know if the LED light strip is shorted out that I'm not getting readings from & that's causing these off readings or if its just a power supply issue causing the whole thing. This issue also changes the power going into the led drive system from 124 to 109-115 then also goes back to 124.
Any input from here would be nice this is where I get lost & can't find a schematic to even check anything besides what the board tells me what some are supposed to read.
So the only thing that stopped this cycling is when I unplugged the power supply from the main board. These readings are from the power supply unplugged from the main board. Also got you guy's pictures of the two boards and everything together.
Power supply number is BN44-00428A
Also no back lights when the main is unplugged from the power supply.
CNL802A
1. L2+ 0
2. L6+ 56
3. L2- 0
4. L6- 23
5. L1+ 0
6. L5+ 23
7. L1- 0
8. L5- 0
9. BLANK
10. BLANK
11. L8+ 33-45
12. L4+ 33-45
13. L8- 3-15
14. L4- 3-15
15. L7+ 23
16. L3+ 23
17. L7- 0
18. L3- 0
19.
20.
21.
22.
CNL802B
1. R7+ 124
2. R3+ 124
3. R7- 90
4. R3- 90
5. R8+ 90
6. R4+ 90
7. R8- 55.9
8. R4- 55.9
9. BLANK
10. BLANK
11. R1+ 124
12. R5+ 124
13. R1- 0
14. R5- 90
15. R2+ 0
16. R6+ 90
17 R2- 0
18 R6- 56
CNM803
1. OD LEVEL 5.1 1.2-5
2. P_DIM 4 0
3. OD ON/OFF 4.9 1.2-4
4. P_DIM 3 0
5. GND
6. P_DIM 2 0
7. B13V 12.6 1.2-10
8. P_DIM 1 0
9. B13V 12.6 1.2-10
10. B13V 12 1-10
11. VAMP 16.9 .9-13
12. BLU ON/OFF 4.5 1.1-4
13. VAMP 16.9 1-13
14. GND
15. GND
16. GND
17. B5V 5.2 1.3-5.2
18. A5V 5.2 stays the same
19. B5V 5.2 1.2-4.8
20. POWER ON/OFF 3.0 stays the same
21. N.C.
22. N.C.
Now on CNM803 on the right is readings I get after the power supply is plugged into the main board for a minute then unplugged last this way for about 2-5 minutes then goes back to regular readings. I also get these readings sometimes right when I plug in the power supply for the first time even without plugging it into the main board. I don't know if the LED light strip is shorted out that I'm not getting readings from & that's causing these off readings or if its just a power supply issue causing the whole thing. This issue also changes the power going into the led drive system from 124 to 109-115 then also goes back to 124.
Any input from here would be nice this is where I get lost & can't find a schematic to even check anything besides what the board tells me what some are supposed to read.
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