Samsung UN43NU6950FXZA No power

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • mrtek
    Senior Member
    • Oct 2010
    • 53
    #1

    Samsung UN43NU6950FXZA No power

    Hi

    Picked up another TV. Samsung UN43NU6950FXZA. No power and no standBy led on. Removed back cover and:
    Main fuse = OK
    Back light LED = OK. Power them with aux power source
    LED output = OK 156V
    I do get 12 V DC out of the power supply going to the digital section but no 5V or 3.3V. PS_on voltage is only 1.8V. I have looked everywhere on the PCB , I could not find i reference for 5V output.
    Also removed connections to panel, speakers and remote but no luck. One strange thing is that even with the LED power supply working, backlight LED do not turn on when power button is pressed. The power button signal goes from HI voltage of .445 V to a LOW voltage of .124 V. The switch is not stuck in one position.
    This TV has only one PCB wich includes power supply, main and t-con.
    Wondering if anybody has a schematic or experience with this kind of board.
    Click image for larger version Name: 20250719_200637.jpg Views: 82 Size: 2.58 MB ID: 3687034 Click image for larger version Name: 20250720_213616.jpg Views: 33 Size: 2.89 MB ID: 3687035 Click image for larger version Name: 20250720_213642.jpg Views: 33 Size: 2.14 MB ID: 3687036
    Thank you in advance for any advice / info.

    Massimo
    Tags: None
    Previous template Next

    Related Topics

    Collapse
    • Tynan Dill
      Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
      by Tynan Dill
      I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

      Upon bringing it home and plugging it up, it showed a standby light.

      I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

      The screen seems to blackout and stay black, but with a flashlight I can see the display.

      With my Playstation 4 connected via HDMI, and running a game I can hear sound.

      Assuming...
      ORIGINAL POWER SUPPLY BOARD
      7 Photos
      11-22-2024, 01:46 PM
    • sam_sam_sam
      Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
      by sam_sam_sam
      I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

      One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
      03-31-2024, 02:12 PM
    • sam_sam_sam
      Modification to a ZD-987 desoldering/soldering station using a external switching power supply
      by sam_sam_sam
      I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails

      I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
      07-01-2024, 06:34 AM
    • cheeky2
      Samsung BN44-00262A H37F1-9SS power supply help finding blown value components!
      by cheeky2
      This Samsung combined power supply and inverter was replaced a while ago from a Samsung 37inch LE37B530P7W TV. However I would like to repair this one.
      I have replaced the Mosfets Q1820 and Q1821 ( FDPF7N50U) which were both blown and the fuse FM802S. The schematic for this power supply that is attached doesn't relate to this power supply as the driving transistors and diodes are D1830, D1831, D1832, D1833, Q1811 & Q1810 are nowhere on the schematic!
      Does anyone know what the components for D1830, D1831, D1832, D1833, Q1811 & Q1810 should be? I ask as I did change the Mosfets...
      06-15-2025, 05:12 AM
    • JimBanville
      Definitive technology SC 2000 subwoofer amp's power supply clicking and popping
      by JimBanville
      The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
      Opened it up and discovered the power supply is making a faint clicking or ticking sound.
      I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
      I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles...
      09-13-2023, 07:21 AM
    • Loading...
    • No more items.
    Working...