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Samsung UE60H7090 LED TV: Black Screen, no Backlight, got sound

Hi

my TV screen changed to black and no backlight after some hours running.

When I switch it on, red led flashes 5x. When I stream music to an device connected to HDMI I can hear the sound and control volume on the TV. I cannot see anything even using the flash light test.

I removed back plate and checked for obvious faulty components. Nothing found. T-con has 1 Blue led on.

I measured fuse on the T-con has continuity and 12V.

  • when I disconnect only mainboard, backlight comes up
  • when I disconnect only T-Con, backlight comes up, too
  • when I disconnect only LVDS cable mainboard to t-con, backlight comes up
  • T-con has two pairs (4) of LVDS cables to Panel. When I disconnect 1, 2, 3 (from right to left), nothing happens. When I disconnect all 4 OR only the left pair, backlight comes up and 3 Blue Leds on t-con are on.

Can someody identify which board I need to exchange (hoping it is not a defect panel)?

Thanks

Sebastian

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Update: When I disconnect 2 of the 4 ribbon cables to the Panel, I get a working and bright picture on half of the screen, the other half shows vertical white lines.

Does that mean I have a defect panel?

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Got a quote from a Samsung repair service center: Panel to be replaced, about 1200€.

Will probably switch to a different make, bye Samsung

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@oppee

did Samsung send somebody out to check it for you. This “When I disconnect 2 of the 4 ribbon cables to the Panel, I get a working and bright picture on half of the screen, the other half shows vertical white lines” sounds more like a T-con board or main board error than a panel error. Not saying it isn’t but I consider it unlikely and would most certainly replace the main board first. “ I’d replace the t-con first.

Update (08/11/2018)

I am not saying it is or it is not the panel, but this is such an odd error for a panel failure. This truly sounds like a T-con board error. The reason while It works on one side but not the other could be the error on the board. I'd buy a t-con board from a place that I could return it to just in case it is the panel (that is an odd error)

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I took the TV to a Samsung Repair Center, and their diagnosis after 2 days was the panel defect…

Maybe I should have added that pulling out the 2 cables and getting a working half of the screen only worked for one pair of the four cables. When I do exactly the same thing but only with the other pair the screen stays black and the blue LEDs off.

I am not a TV expert but I would explain this behaveiour with some sort of self test after the boot process. The t-con seems to detect an issue one half of the panel and then shuts off data and power lines to the panel.

Would you agree or do you recommend to find a replacement board on ebay?

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Sounds to me: Bad T-Con Board or bad Cap on LCD Ribbon PCB. Check Cap´s for shortcircuit. (little late, but help for other people ;) )

Best regards, TimoS

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Seb さん、ありがとうございました!
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