Samsung UE49KS7090 (2016) TV - no power, no red light - which part is faulty?

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • bobsapp
    New Member
    • Oct 2021
    • 3
    • Germany
    #1

    Samsung UE49KS7090 (2016) TV - no power, no red light - which part is faulty?

    Hi all,

    Samsung TV UE49KS7090 (2016).
    No power, no red light. When I unplug the mainboard from the power board, HALF the backlights flash briefly. I made a short video here https://youtu.be/EVikW32p6kQ

    Voltage measurements:
    With mainboard DISCONNECTED, I see all voltages to be ca. 5-7V
    With mainboard CONNECTED I See voltages of ca, 4-6V
    According to the pinout diagram, I should be seeing 13V.

    Would anybody know which part is faulty? Everywhere I read, it is expected that when you disconnect the mainboard, the backlights stay on permanently. But this is not the case with me. I'm suspecting the backlights (which of course are the hardest to repair IMO).

    Thanks a lot for any support.
    Tags: None
    • bobsapp
      New Member
      • Oct 2021
      • 3
      • Germany
      #2
      Re: Samsung UE49KS7090 (2016) TV - no power, no red light - which part is faulty?

      BUMP :-)
      does anyone know which component needs replaced if,m when I unplug the mainboard from the power supply, it results in briefly flashing LED, like in the video?

        Comment

        • Davi.p
          Hobbist Tech
          • Sep 2009
          • 4463
          • Italy - Milan
          #3
          Re: Samsung UE49KS7090 (2016) TV - no power, no red light - which part is faulty?

          test PSB with some loads..
          Last edited by Davi.p; 10-27-2021, 04:32 PM.

            Comment

            Previous template Next

            Related Topics

            Collapse
            • Michael Long
              No Standby Light on Samsung UN65MU6300FXZA with Mainboard BN94-12440E
              by Michael Long
              I had a Dead Samsung UN65MU6300FXZA with Mainboard BN94-12440E
              Dead / No Power / No Standby Light results after power company had three
              consecutive power outages on/off/on/off/on/off after which TV was rendered unresponsive.

              After exploring the issue found Mainboard was the fault. Then with research on this site determined IC1604 was the suspect. The IC1604 is a surface mounted device (SMD) EEPROM, Winbond Model 25Q40CLSIP. A read on this EEPROM came back with all FF FF FF FF FF in all registers blank and empty of data. I had a spare mainboard with intact IC1604 and utilized...
              09-13-2022, 06:55 AM
            • Document Archive
              Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
              by Document Archive
              This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
              09-07-2024, 05:50 AM
            • badboyzzz
              Samsung UE50AU8072 all time rebooting, backlight ok. Maybe mainboard faulty?
              by badboyzzz
              The motherboard initially receives voltage for VGH, but it constantly reboots. When I remove the flex cable at the bottom, I hear normal sound, but there is no image on the screen and it is black on both sides. This time there is no voltage on VGH.

              ​...
              03-25-2025, 10:48 AM
            • Nairolf
              Samsung DM32D – Red LED blinks 5 times, won’t start (possible mainboard issue)
              by Nairolf
              Hello,

              I have a Samsung DM32D display.
              When I try to power it on, the red LED blinks 5 times and nothing happens—the unit won’t start.

              Here’s what I have tried so far:
              1. Disconnected the cable between the mainboard and the power supply → the backlight turns on.
              2. Disconnected the main T-CON ribbon cable → same issue as before, the LED still blinks 5 times.
              3. Disconnected one of the two T-CON ribbons to the panel (tested each one separately) → same issue, the LED blinks 5 times.

              From these tests, I suspect the problem might be on the mainboard. Could anyone...
              3 Photos
              08-24-2025, 03:47 AM
            • Kaar3l
              Samsung QLED QE65Q7FNAT only standby light
              by Kaar3l
              TV: Samsung QLED QE65Q7FNAT
              PSU: BN4400940A
              MB: BN94-12832K

              I got the tv in spring 2024. At that time it started, then ran 60 sec and poweroff. Seemed like reboot issue. I didn't have time and room to check it in summer so I plugged it in and now the standby light is on. I press button on remote, standby light goes off and tries to start?. No picture or backlight on LCD. I thought about removing diodes like in this thread: https://www.badcaps.net/forum/troubl...sung-qled-q60r...
              09-24-2024, 01:35 PM
            • Loading...
            • No more items.
            Working...