Samsung D5520 LED - black horizontal bar on screen. Troubleshooting help needed.

[jpmad4it]

Hi all,

My first post !!

So I've been trying to troubleshoot my faulty Samsung D5520 LED 40" today. The issue I have is a constant black horizontal bar across the top of the screen. I think I narrowed it down to the T-CON board, the master or slave panel which connect to the T-CON board, the bonding of the 'tabs' under the metal frame or the LED panel itself. I couldn't get into the metal frame to test the bonding on the "tabs" as the screws holding in place wouldn't come out. They are soooo soft they just perished when I tried to get them out! #fail - this really annoyed me.

Just a quick question....... the black horizontal line appears from the top-left of the screen and fades out to the top-right of the screen. If I unplugged the right-hand side cable from the T-CON board and didn't remove the left-hand side cable I didn't get any picture at all, yet if I removed the left-hand side cable and kept the right-hand side cable in place I got half a picture on the right-hand side of the screen. I swapped the cables around to make sure that one of them wasn't faulty and the same happened....so it's not the cables. Could this be the T-CON board failing to give out a picture to the left-hand side of the screen?

I'm thinking it might be more related to the tabs that are hidden under the metal frame, because squeezing the top left hand side of the frame sometimes makes the black horizontal bar disappear. Does this suggest poor bonding of a "tab" in that position? However, I read that a fault with the bonding of the "tabs" usually gives a "flashing" effect whereas what my TV has is a more of a constant black bar, which again makes me think it's the T-CON board!

Does anyone have any advice - TCON board or tab bonding issue??

All the backlights on the LED panel work fine, which makes me think it isn't the panel itself.

Any help or suggestions would be great.

Great forum!!!

[tom66]

Re: Samsung D5520 LED - black horizontal bar on screen. Troubleshooting help needed.

Most likely it is a bad tab and/or bad panel. This is a common fault with this model. I'm not aware of anyone fixing it yet unfortunately. I really doubt it is a t-con fault. On eBay I am watching tons of Samsung D-series LED-LCD TV failing early. There might be a case for dealing with Samsung as a TV should last beyond 2.5 years.

[jpmad4it]

Re: Samsung D5520 LED - black horizontal bar on screen. Troubleshooting help needed.

Most likely it is a bad tab and/or bad panel. This is a common fault with this model. I'm not aware of anyone fixing it yet unfortunately. I really doubt it is a t-con fault. On eBay I am watching tons of Samsung D-series LED-LCD TV failing early. There might be a case for dealing with Samsung as a TV should last beyond 2.5 years.

hey there,
Thanks for the quick reply. I guess the next step is getting the metal frame off to check the tabs

The TV was 18 months old when it failed. We tried at least 3 or 4 times with Samsung and they didn't want to know as it was out of the 12 month warranty. It was bought on finance and we got this cleared under the sales of goods act. We were left with a broken TV, but at least we weren't paying for it.

[tom66]

Re: Samsung D5520 LED - black horizontal bar on screen. Troubleshooting help needed.

That sucks.

Samsung, Panasonic, LG, etc. None of them stand behind their products after 12 months. It's like they never knew you. It's ridiculous and disturbing.

[jpmad4it]

Re: Samsung D5520 LED - black horizontal bar on screen. Troubleshooting help needed.

That sucks.

Samsung, Panasonic, LG, etc. None of them stand behind their products after 12 months. It's like they never knew you. It's ridiculous and disturbing.

I'd have been livid if I paid cash for it, as then I wouldn't have had any route to go down. I think we had paid a bit of the finance off, but the majoirty of it was cleared which was better than nothing.

Not sure how I will get into the metal case, the screws are "screwed"! Sure I have a drill somewhere

[jpmad4it]

Re: Samsung D5520 LED - black horizontal bar on screen. Troubleshooting help needed.

Hi again. Since last time I have bought a new T-CON board, installed it and tested and the picture is still the same.

I had the metal frame off and noticed that the tabs are built into the LCD panel, so if these are bad I guess it's not worth trying to fix due to cost? The T-CON board also connects to two buffer boards at the bottom of the screen, and if one of these has failed it's also pointless trying to fix as these have tabs built into them which also feed directly into the LCD panel. I guess these control the picture on either side of the screen too? If one side of the screen is working but the other isn't (as described in my first post) does this help to troubleshoot which part could be faulty? I just was just wondering if the main board can produce errors like this, or would it affect both sides of the screen?

I'm just trying to figure out whether to buy a replacement main board as a final step in trying to fix the TV, along with the L-shaped cable that connects the main board to the T-CON board? How easy is it to test the boards for faults or short-circuiting? If I can find a fault I guess I can then buy the right part in confidence.

Any help would be great in advising me on which step (if any) to take next.

Cheers Jp