Question about Samsung UN39FH5000FXZA - 39in 1080p 240 Cmr Led Fh5000 Series

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Have a Samsung UN39FH5000 LED TV (a refurb that's out of warranty). Last week the screen went out....still hearing audio, but the screen is completely black. Neither the "welcome" screen, nor any menu

Have a Samsung UN39FH5000 LED TV (a refurb that's out of warranty). Last week the screen went out....still hearing audio, but the screen is completely black. Neither the "welcome" screen, nor any menus are visible. Just a black screen. Opened the back and inspected the components on the three visible PC Boards. All looked OK including the capacitors. Bought three replacement boards anyway on eBay for $36 total and installed them. Nothing changed....TV turns on but the screen remains black. Any ideas before I put the TV out as trash?

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  • John DeGrauw Jun 14, 2015

    SO THE TV IS NOW FIXED...finally! It was the LEDs. After a busy Spring work-wise, I got around to ordering replacement LED strips for the TV -- a set of three was just under $32 including shipping. And they were returnable, in case it didn't fix the problem. After I swapped them out and put everything back together...it worked!

    I never did check each LED though....the LEDs look to be hermetically sealed to the base, with no access from the rear of the strip. But I should point out that none of the LEDs looked obviously burnt/discolored.

    Anyway, I took a number of pictures and took notes on disassembly, so I wouldn't forget how to put it all back together. Any questions, just ask. I'll be happy to provide pics/whatever.


  • John DeGrauw Jun 14, 2015

    Side view...

  •  Mikey
    Mikey Jun 14, 2015

    Excellent job John.....well done for persevering!

  • John DeGrauw Jun 14, 2015

    Thanks Mikey. And thanks for your coaching and advice along the way!

  • Karding Sungkit Jul 21, 2015

    Hi john, thanks for the posting.
    But can you give me the site where you bought the LED's? And can you guide me how to get through those LED's as well? Thanks a lot

  • Christian Santos
    Christian Santos Jan 09, 2016

    hi i have the same tv and problem but i cannot find those LED strip???

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6 Answers

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  • Samsung Expert
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This is the common problem for this model, that the TV powered up, has sound, but no display.

1. Open the back cover & turn the TV on, if the back lights is not on, please check the voltage on CNL802 on power supply board, it should be 140V DC (Between the blue & black wire),
A. if the voltage is there, it indicates the LED strip inside the panel is defective, you have to replace the LED assy to fix it.
B. If the voltage is not there or low, then measure the voltage on Pin 1 & 5 on CNM805, the voltage should be 12-13V DC, if the voltage is right, the power supply is bad, replace it.
C. If one of the voltage is low, or not presents, replace the main board.

2. If the back lights is on, but no display,
A. Please check the fuse FP1 on the T-CON board, if it is open, replace the T-CON board.
B. If the the fuse is OK, please replace the main board.
C. We do have some special instances that the main board & T-CON board is OK, but the LCD panel buffer board has problem , if this is the circumstance, your TV is not worth to repair.

If you have any more question, fell free call me at (541)683-8887.

I hope that this would help you.

Posted on Feb 03, 2016

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Hey John,
Did you end up repairing your Samsung ? I am having issues. replaced 3 boards, and my result is blue flashing, ans flashing display. No sound, no video.

Posted on Oct 14, 2015

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Im having the same exact problem on mine also .anything end up working?

Posted on Jun 09, 2015

  •  Mikey
    Mikey Jun 09, 2015

    If there is a faint picture.....shine a light at the screen when on and you should see an outline, this is the screen inverter that is faulty!

  • Heather Jun 09, 2015

    No faint picture,nothing at all

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Hi, My name is Wayne and I own Affordable Mobile TV Repair in Va Beach Va. If you have any soldering skills, you can repair the LED strips. The easiest way to do this is to take your multimeter and check the resistance across each led. In one direction the led will light up slightly. In the other direction, the LED will not light. That will show that the LED is working. LEDs either short or open. If they short, they need to be removed. If they are open you can just solder leeds over the open LED and attach additional LEDs as necessary. For additional information, please go to AffordableMobileTVRepair.com and submit a service request for FREE technical information. thanks

Posted on Apr 21, 2015

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Hey, John, did you ever find a solution to this problem with the Samsung LC TV. I have exactly the same problem and all three boards did not fix the problem. I have the whole TV apart now down to the led strips and am clueless. Wondering if you found the problem.

Posted on Mar 25, 2015

Testimonial: "In fact, no. At this point it's an academic exercise for me! I have the TV apart as well, down to the LED strips. Sourced them on eBay but I'm finding that -- unlike the boards -- the LED strips are not returnable. Will be testing the LED strips at a friend's house. He has a variable power supply and we'll see if the LED strips are good. But I can say that none look burnt. At the time my friend was over and he checked the cold-side voltages (on the old power board that's now reinstalled) going to each LED strip and they all seem to be within spec. Will report back on my progress"

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  • Rj Mueller
    Rj Mueller Mar 25, 2015

    This has become sort of a challenge to me now. It started out as sort of a simple problem because one of the three boards had to be bad, right? Nope, unless one of the boards I bought on Ebay are the problem which is highly likely. Do you know what voltage to appy to the strips. I had the same idea to test the strips by just applying a voltage but don't know what the voltage is. I tried finding a schematic or diagram of this TV but nothing out there.

  • John DeGrauw Mar 25, 2015

    I Unfortunately I don't know the voltage. My friend is an appliance/tech repair guy and knew from looking at info the power supply circuit board what the output voltages were supposed to be. I'm due to go there this week (or weekend) with the TV to test it. Btw, I had that exact same logic about the board swapping...highly unlikely that a board from a unit with a cracked LCD would be faulty.

  • John DeGrauw Mar 25, 2015

    Fortunately all three boards were returnable without a restocking fee.

  • Rj Mueller
    Rj Mueller Mar 25, 2015

    Thanks for the info. I am going to fire up the TV again and see if I can get a voltage reading and then run the lights to see if they light up. It is a backlight problem so it must get power from the power supply board but I changed that. Strange problem. let me know if you get some other info on this. I am dead-ended. I even found a TV repair place to take it to but the guy declined as he said he would have done just what I did.

  • John DeGrauw Jun 14, 2015

    Hey RJ. Not sure if you'll get the notice of my latest post, so I figure I'd comment directly to your thread. The TV is fixed. The problem was with the LED strips, btw.

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Can you see a faint picture when looking up close to the screen? If so this could be the screen inverter that lights up the screen that has gone!

Posted on Dec 14, 2014

Testimonial: "Thanks for the reply, Mikey, but I don't see a faint image. I'm in the process of returning the three boards I bought on eBay. As a last resort I ordered the cable set for this TV on eBay ($12 including shipping). I'll swap out the cables one by one to see if anything changes. Who knows.....the solution might be that simple!! Will report back after I get them and test."

  • 9 more comments 
  •  Mikey
    Mikey Dec 14, 2014

    Your right it's worth a try..... But normally if the cables are faulty you would get a white screen! This appears to be showing symptoms of the backlight....... Can you turn the TV on and shine a torch at the screen to see if there is a faint picture visible?

  • John DeGrauw Dec 21, 2014

    Hey Mikey. Had time today to do a little more testing on this. I got the cables and replaced them -- still the same problem with the black screen. Also, I did as you said and shines the torch at the screen and I DO see a faint image. But I replaced all three boards...you would think that would have fixed the problem, right? In any case, which of the three boards show in the picture would control the backlight? Although it's unlikely, maybe the "new" board that controls the backlight was bad too?

  •  Mikey
    Mikey Dec 21, 2014

    Hi John, I am familiar with screen inverters boards on laptops and these are separate! It could be the inverter board is built in to one of the boards you replaced and could be faulty but we will assume for now that the boards are ok! This could point to the LED bulbs or the board is separate!

  •  Mikey
    Mikey Dec 21, 2014

    On laptops the inverter board is located at the bottom of the screen and visible from the front! Can you see where the LED lights are and trace it back?

  • John DeGrauw Dec 21, 2014

    First, thank you for your amazingly prompt responses. As I was tinkering earlier I took the whole TV apart, realizing that I had nothing to lose. I traced the cable from the power board to three rows of LEDs. I would think that the LEDs are OK....unless if one goes bad they ALL go out, like a cheap string of Xmas lights with a blown bulb?? The small PC board (the T-Con board) is shown at the bottom of the TV, feeding the PC boards along the bottom edge. Here's a link showing a labelled picture:http://johndegrauw.com/samsung-UN39FH500...

  •  Mikey
    Mikey Dec 22, 2014

    Ok! Have you a test meter? I would try and trace back through the circuit board from the plug at the top going to the bank of LEDs and test the resistors along the way! Since there does not seem to be a separate inverter board, it could just be a bad resistor if you are lucky!

  •  Mikey
    Mikey Dec 22, 2014

    We could rule out the LEDs being bad as you correctly stated if 1 led was bad then they will all go out but since you have 3 banks only 1 bank would go out, unl

  •  Mikey
    Mikey Dec 22, 2014

    We could rule out the LEDs being bad as you correctly stated if 1 led was bad then they will all go out but since you have 3 banks only 1 bank would go out, unl

  • John DeGrauw Dec 22, 2014

    I do have a meter and I'll start checking the resitors for continuity and proper resitance. I have a noobie question, however....can restistors be tested on the board, or do they need to be removed from the PCB to test? Fyi, prior to buying the replacement power board I desoldered to two large blue caps and tested those as OK out of the circuit, as per some YouTube video I watched.

  • John DeGrauw Dec 22, 2014

    "THE two large caps" not "to" btw

  •  Mikey
    Mikey Dec 22, 2014

    Yes resistors can be tested without removal! Make sure no power and capacitors are discharged, I would remove the top right board and follow the track from the plug for the LED bulbs!

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