UN55D6000 - [WAS] turning back on after poweroff [NOW] wont turn on at all

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • fuxxy
    Badcaps Veteran
    • Jan 2013
    • 318
    • USA

    #1

    UN55D6000 - [WAS] turning back on after poweroff [NOW] wont turn on at all

    Samsung UN55D6000 - 55" LED Smart TV.

    Got this set with shorted LEDs in the backlight assembly. This unit uses two rows of LEDs along the left and right edge of the screen. I replaced both LED strips, and the set worked perfectly until now.

    A couple of months ago, we noticed that the TV was turning itself back on after being commanded to power off. I tried diagnosing every possibility except for opening up the TV - blocked the iR sensor, disabled network control and HDMI-CEC in the settings, unplugged the network and HDMI cables leaving only the power cord connected - TV still turned back on immediately after powering off.

    Fast forward to a week ago - I noticed the TV was off. I tried to turn the TV back on with the remote, and no response. Walked up to the TV, and noticed the red "standby/power" LED next to the power touchpad was flashing rapidly. It didn't seem to be flashing in any sort of error pattern, just rapid flashing that did not pause or stop at any time. All buttons on the front panel and remote control are unresponsive.


    Do these symptoms seem to correlate to a faulty circuit in the power board?

    I guess I should start tearing apart the TV and checking voltages.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: UN55D6000 - [WAS] turning back on after poweroff [NOW] wont turn on at all

    Do the visual inspection of the boards, look at the connectors at both ends of the cable that goes from power supply board to the main board.
    Check the Voltages at the power supply connector when TV is off and when power switch is activated.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6363
      • Germany

      #3
      Re: UN55D6000 - [WAS] turning back on after poweroff [NOW] wont turn on at all

      SPI Flash need reset via service menu or replace

      Comment

      • Nick's Tvs
        Badcaps Veteran
        • Jan 2014
        • 621
        • USA

        #4
        Re: UN55D6000 - [WAS] turning back on after poweroff [NOW] wont turn on at all

        I highly suggest you perform a factory reset. If you don't know how, check out this video:

        https://youtu.be/15iwEiWezvs

        Comment

        Related Topics

        Collapse

        • pajdek
          Lenovo Y700-17ISK turn on and off
          by pajdek
          Hello, i have some issues with my laptop Lenovo Y700-17ISK (motherboard BY511 NM-A541), it started when i turn on the laptop, but the lcd wont turn on, i then connected it via hdmi to tv and screen was ok. So i thought maybe lcd stripe is faulty, i removed the bottom cover, disconnected main battery, reset the cmos by disconnecting battery for 1 min, then slighty move the lcd stripe. Conncted power supply and tuned on my laptop, the lcd turn on, it started to load os, then it turn off, after a second it turn on, then after like 3 seconds turn off again, and so on. Removed power supply, waited...
          09-20-2023, 02:49 AM
        • reessi
          Acer Alienware Nitro 5 (GH51G LA-L181P Rev: 1C) & Dell Alienware M15 (GDP50 LA-k452P Rev:1) - Both Shorted PCH (SRKMA)!
          by reessi
          Hello:

          I have both these laptops that appeared to have the same fault so I thought I would have a go at replacing the PCH as something to learn, they both are using the same PCH.


          I started on the ACER:

          Up on connecting power no signs of life but current is consumed from the bench power supply and the PCH is hot.
          All the caps on the top of the PCH are showing 0 ohms and the 3.3v rail is shorted.

          I followed the videos from Sorin, Electronics Repair School on Youtube heating from the bottom to install. I practised on around 10 scrap...
          10-29-2024, 11:31 AM
        • chopduel
          Bad mains power causing TV malfunctions?
          by chopduel
          Hi,
          I've been living in the same apartment for about 5 years now, and moved into it with my old Samsung plasma TV (PS51F5500).
          Ever since we've moved in, we would sometimes see strange power-cycling behavior. For example:
          • TV would randomly turn off then back on.
          • TV would turn off and the LED light would blink for a while (over a minute sometimes) until eventually it went back to a regular off state and could be turned on
          • Sometimes it would require disconnecting the mains cord from the TV, waiting several minutes, then putting it back in and turning the TV back on. This had limited
          ...
          12-29-2024, 03:20 AM
        • sam_sam_sam
          Lift Master Garage Door wall switch display / motion sensor controller display disappeared no back light
          by sam_sam_sam
          This happened last Saturday and today I finally had time this morning before I went to work to replace two non brand capacitors

          I will let you be the judge weather or not these are bad or not according to the blue ESR meter that I am using

          I am comparing them to a brand new one that I installed

          The display came back on and the programming was not lost which I was surprised by I would have thought that when the display went blank that so did the memory as well

          I going to let it run for several days before I remount back on the wall next to the...
          09-05-2024, 06:48 PM
        • JohnML1975
          Falcon FF32S53 turns off by itself then will not turn back on unless you wait
          by JohnML1975
          Dear Forum members

          I searched for a forum on this model TV and could not find so thought I would start a thread on this model and make
          I will upload some photos and share my trouble shooting steps so far
          07-20-2025, 12:28 AM
        • Loading...
        • No more items.
        Working...