75uq7590pub Has backlight no image

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • ShatterMasters
    Member
    • Oct 2017
    • 14
    • United States

    #1

    75uq7590pub Has backlight no image

    I have a 75uq7590pub that was dropped off for recycling. The Tv powers on and has audio but no picture, the backlights are working. Here is what I have attempted so far. Replaced main board, tried connecting one ribbon at time and testing. Not sure where to go from here. Any ideas?


    Thanks!!
  • EazyBone
    Badcaps Legend
    • Jun 2023
    • 1319
    • United states

    #2
    Lookup fixing TV with tape. See if you can get a picture that way.

    But also try to disconnect one of the ribbons on the buffer boards that is orange/transparent at a time also. See if that does anything first.

    Its no unheard of to get a bad main board, but if both boards have sound and no picture I would start checking the panel

    Comment

    • ShatterMasters
      Member
      • Oct 2017
      • 14
      • United States

      #3
      I have tried the tape trick on some other models.

      Tried un hooking the ribbons on the LCD flex with no change.

      I was not the person who ordered the mainboard, I am having little luck finding the same tv version mainboard. Id assume that is important?

      Thanks!

      Comment

      • EazyBone
        Badcaps Legend
        • Jun 2023
        • 1319
        • United states

        #4
        Ah okay, then it's possible to suspect the main also. Do you have both main boards? Do they both do the same thing? What's the EBT numbers on both

        Tape trick will not always show a panel short, but it's semi reliable.

        Comment

        • Storyteller12
          Badcaps Veteran
          • Jun 2020
          • 624
          • USA

          #5
          I've fixed a few of these TVs in the 55 and 65" models with same problem. Seems the buffer board from the panel gets shorted out to the frame somehow. I removed the buffer board and put electrical tape where
          the buffer boards contact any metal and problem fixed.

          be careful not to rip/ tear one of the cofs.

          Hope you have the same problem so it's an easy fix.

          good luck, let's us know

          Comment

          Related Topics

          Collapse

          • triplefour
            UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
            by triplefour
            this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
            i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
            unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
            according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
            09-13-2023, 10:43 PM
          • 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
          • 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 ‘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 ‘new' Tcon board this time, and
            ...
            06-09-2024, 10:28 AM
          • 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
          • Salem Aboshala
            820-00138-A got image but no backlight
            by Salem Aboshala
            Dears, this is my first post here and first try to fix my own laptop Apple MacBook Pro Retina 15-inch Mid 2015.
            I have some general electronics troubleshooting experience and still as my hoppy but this is my first laptop trying to fix.

            History: my laptop backlight stopped working without any reason.
            Symptoms:
            I have image on screen using my flashlight.
            I have fully working laptop with the help of my external SAMSUNG LED tv via HDMI cable.
            Keyboard backlight still working and can be adjusted normally.

            Since two days I tried to follow all similar...
            06-11-2024, 03:02 PM
          • Loading...
          • No more items.
          Working...