No backlight, with sound Samsung lcd LN46B640R3F

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  • Ierwin
    Samsung UE60KU6079 backlight okay mainboard responsive, no picture, no sound
    by Ierwin
    Hello everyone,
    Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
    The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
    He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
    I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
    Anyway I still fully expect that there has been something seriously damaged...
    05-13-2025, 03:31 PM
  • Mgiffune
    Samsung UN60EH6000F Black Screen, Backlight and Sound Good. Power Cycle Returns Picture
    by Mgiffune
    I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started β€˜fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.

    I ordered a supposedly β€˜new' Tcon board this time, and    ...
    06-09-2024, 10:28 AM
  • TR103
    Samsung TV model UE50TU: rebooting, backlight, sound, but no picture
    by TR103
    Hi, I have a Samsung UE50TU with:
    - sound and backlight, but no picture
    - when it arrived, it had a picture for a few seconds
    - it keeps rebooting
    - without ribbon cable between the two panel boards, it does not reboot but I have no picture
    - without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
    - when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.

    - without cable between mainboard and lcd panel and with a jumpered...
    01-22-2025, 04:12 PM
  • Max514
    Samsung UN55H8000 sound but no backlight no video
    by Max514
    Hi all,

    Ok so I have this beautiful un55h8000 samsung tv with sound but no video nor backlight. When turning the set on the red light blinks 5 times.

    The screen shows no damage and backlight turns on when I disconnect the power supply from the main board. The tcon board only has 2 out of 3 leds on.

    I came across this page and followed the different steps: https://techhometravel.com/samsung-u...ight-no-video/
    • Unplugging the main board cable at the power supply >>> backlights came on.
    • BLU_ON signal from the
    ...
    04-14-2022, 10:34 AM
  • arctor
    samsung 50tu8070u black display with horizontal green lines, sound and backlight ok
    by arctor
    hi guy my friend gives me this tv a 50tu8070u that has no picture at all, sound ok, backlights ok. i tought it was a bad panel, but the tv has many horizzontal lines green, i tried with the tape method but nothing change, only the green lines disappear but still no picture. You that have more good than me, do you think it s a panel or can be the main board, because my friend wants buy a new main board....but the tv respond to the remote control, have sound only no picture so i think it s a panel problem that is so broken that i cant fix with tape...or i wrong if someone can help me thanks, i give...
    2 Photos
    04-26-2025, 05:22 AM
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