Chosen Solution
Hi OMG same EXACT problem here did you fix it? Please let me know what the problem was thanks. UN55H6350AFXZA I don’t have test light to check voltage. Nothing tried yet
HOT CAKES start by disconnecting the cable between the main and power board, if the backlight comes on then you know that it is good. Next measure connector CNM803 (should get ~13V) Next check connector CNL802 (0,0,334v,0,223v,0,223v,0). If your power supply has the right voltages for your backlight and obviously the backlight works if it comes on when you disconnect the main board from the PSU, that would leave the main board as the culprit since it provides the signal for the backlight enable. Check for 5V on connector CN201 pin 4 let us know what you get If you do not have that voltage it is a PSU issue). After that check pin 11,12,13 on CN201 for 13V and let us know what you get on that (If you do not have that voltage it’s a main board issue).
