Chosen Solution

Model: LN52C530F1FXZC When we first got this TV(used), it worked fine for a few days, then stopped. After some initial troubleshooting, I left it unplugged for about 3-4 days and then it started to work fine again but after about an hour or so, flickers and goes black again. When I unplug the main board from the power supply, the backlight LED flickers on for a second then off completely. Backlights flicker on when I disconnect the TCon board from the mainboard No blown caps on the power supply board and the fuses have continuity. Voltages (mainboard connected): 12.42V 12.42V 12.42V 0V 0V 5.15V 5.15V 12.42V 12.42V Voltages (mainboard disconnected) Susbstitute 12.42V with 12.81V from above results Susbstitute 5.15V with 5.17V from above results I’m guessing my next step is to test LED’s? How do I do this and what type of readings should I expect? Thank you in advance. G

@myth9 This “I unplug the main board from the power supply, the backlight LED flickers on for a second then off completely” would make me think it is the power board. Your main board is what tells the power board to turn on the backlight (simplified). Since you have nothing turning on it could be the main board or the power board, but when you disconnect the mainboard from the power board it should force the backlight on. So in your case I’d start with a power board, then the main board. A failed T-con board should not prevent your TV from turning on. Explain this a bit more in detail “Backlights flicker on  “ Measure teh voltages on connector CN201 (Main to Power board) you should show: 1==12V 2==5V 3==12V 4==5V 5==5v 6==5V 7==5V 8==GND 9==GND 10==GND 11==GND 12==(signal) 13==13V 14==(signal) 15==13V 16==5V 17==13V 18==(signal) The ones marked signal can be ignored for now.

When I disconnect the T-con board the backlight comes on and then starts flickering after a few seconds. But they stay on. I also forgot to mention that when shining a light on the screen I can see my menu, so a picture is present. The following are the readings I recorded. I posted a pic of how I numbered the ports. My results are a bit different than what you posted. Mainboard disconnected

  1. 12.81
  2. 12.81
  3. 12.81
  4. 0
  5. 0
  6. 5.18
  7. 5.18
  8. 12.81
  9. 12.81
  10. 0
  11. 0.54
  12. 5.13
  13. 0
  14. 0
  15. 0
  16. 5.17
  17. 5.18
  18. 0.76 Mainboard connected
  19. 12.33
  20. 12.33
  21. 12.33
  22. 0
  23. 0
  24. 5.13
  25. 5.13
  26. 12.36
  27. 12.36
  28. 0
  29. 5.13
  30. 0 .48
  31. 1.45
  32. 0.01
  33. 0.01
  34. 5.14
  35. 5.14
  36. 0.86

For anyone referencing this. Managed to find a power supply board and the TV works great. @oldturkey03 Thanks again for this one.