Re: Samsung led tv UN55D7000LF power cycles on & off

I know it's been a couple weeks but I finally got time to take the tv apart & found the led back light boards there are actual LEDs that have broke off the board mostly the top 4 inches on both sides of the boards. There's only two boards holding LED light's one on each side left & right. I'm not the best when it comes to leds like this but that would cause the issue i'm having? I do know that it is a problem just don't want to spend the money on these LED boards & have the same issue still.

Re: Samsung led tv UN55D7000LF power cycles on & off

I get voltage to each of the four when the main board is not plugged in and the backlights dont come on the voltage then is 124. when I plug the main board in the voltage goes up on all 4 but then the PS starts to cycle.

Yes I get voltage to all four when it first comes on but cycles always.

Re: Samsung led tv UN55D7000LF power cycles on & off

Yes I went thru that whole forum it's like every forum I read stops right where i'm at with no answer. I'm really thinking this led drive is my problem I just don't understand it completely but everything I have read tells me this is not right and may cause the tv not to power up. I have 124v going in but nothing on the other 3 lines coming back 13, 15, 17 on cnl802b they run next to the 124v. When I plug the main board in the voltage goes up like its supposed to on all 4 of these wires sending power into the led but the tv...

Re: Samsung led tv UN55D7000LF power cycles on & off

Thats what I was thinking to cause of the readings im getting on cnl802b

11. 124
13. 0
15. 0
17. 0
shouldn't 13 & 15 be 90v and 17 be 56v like the other sets?
So that would mean there's a problem in that set of leds right?

Re: Samsung led tv UN55D7000LF power cycles on & off

Yes it still does even without them connected.

Re: Samsung led tv UN55D7000LF power cycles on & off

No they don't come on at all. No flash or anything from them.
I seen in all the forums I read about this tv and problems with the power supply that you were in everyone. Do the readings im getting seem right to you?

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....

Re: New Members - please post your introductions here

Hello I'm Rick kinda new to all this but I do have a diagnostic back ground more so in the automotive business but all in all it's pretty much taking readings & reporting back until you find a problem but in reading a lot of these treads & doing some of my own research I see you can't always find the schematics you might be looking for. So I'm hear cause this is the best forum I've found that people actually sound like they know what they are doing. Excellent group of guy's here looking to learn a little bit more from...