Hisense H49M3000 PSU buzzing + Black screen after 20min

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • EUWest
    Member
    • May 2019
    • 44
    • Germany
    #1

    Hisense H49M3000 PSU buzzing + Black screen after 20min

    Hey Folks just got another Hisense with an unusual Problem.

    After plugging in its starts buzzing on the cold side. Could not located it 100%, but seems like transformer/capacitor.

    TV has 1 horizontal Line, often static. After 10min screen gets flickering and after about 20min screen gets Black while Sound is on. After turning off and on screen appears back for about 5min and then went Black again.

    I checked LED Voltage:
    While Screen is on about 115v
    While Screen is Black also about 115v
    LED Connection unplugged also 115v
    Flashlight test while Black is negativ

    I already replaced an schottky diode 20100 because while its in place 2 Pins shorting.

    What else could i Check?
    Attached Files
    Tags: None
    Previous template Next

    Related Topics

    Collapse
    • frannyjunk
      Hisense 40H4F no backlight but turns off after splash screen
      by frannyjunk
      So I have this Hisense tv where the backlight does not come on. But when it is turned on, when I shine a flashlight on the screen, I can clearly see the splash screen then it turns off. I looked at the mainboard and was expecting to see bulged capacitors, but they all look fine. I unplugged the backlight from the mainboard, and get the same symptoms (i.e. no backlight, dark splash screen then just a black screen). Is this just a backlight issues? Do Hisense tvs turn off by itself if the backlights are unplugged or are bad? Or is this a mainboard issue?

      TIA.
      09-24-2025, 10:59 AM
    • Ryan.man
      Macbook 2017 with touchbar (A1706) won't turn on after removing the screen
      by Ryan.man
      Hello everybody! Posting this in hopes somebody has some expertise that leads to a clear path of troubleshooting that saves me a lot of time!

      My macbook has the flex cable problem, the one that prevents the screen turning on. Ive been dealing with this for the last 3 years. Last year it went dead and I managed to fix it following youtube tutorials. But my fix wasnt the best, the problem returned a month later. This week, it went dead again. I again tried to fix it.

      This time the original cable broke too close to the screen, it can't be fixed without tearing the screen...
      02-04-2025, 12:23 PM
    • reformatt
      Macbook Air M2 A2681 Kernel panics after screen replacement
      by reformatt
      Just had a customer bring in a M2 MBA A2681 that had had a screen replacement in April at another repairer. Since then, she has been getting intermittent kernel panics. It's an aftermarket screen, and of course it fails in diagnostics as the calibration hasn't been done. The error in the panic log is "No device added after powering on the rails".

      It seems the original repairer has swapped the board and the screen to other MAC's, and said that it isn't a screen issue. From what I understand, by doing a quick search on Google, this is in fact a screen issue. The panic relates...
      07-31-2025, 08:37 PM
    • smic717394
      iphone XS turns off when press on screen.
      by smic717394
      Hi,

      I have a iphone XS that came in for a screen replacement, the screen was badly cracked, and inside missing scues, on the back of the screen still the blue protector, the screen was a LCD. So we replaced the screen and all good, installed the screen and we noticed that pressing the screen with a bit of force but not excessive, the phone dies. After plugging the charger it turns back on, but again if you press it it dies. I open the phone again, and I can't see anything major, with the phone open, if I press on the logic board, battery, charging board, or even putting pressure on...
      07-25-2024, 10:16 AM
    • Runlinc
      Hisense 55E76GQTUK screen removal?
      by Runlinc
      Hi all, I need to change the backlights in a Hisense 55E76GQTUK. The screen is glued to the chassis, what is the easiest way of delaminating the screen from the chassis please?
      also what double sided tape would you recommend to glue it back in? ….. or is that a question to ask once the screen is out in one piece?
      Many thanks for any ideas you have.
      04-09-2024, 10:02 AM
    • Loading...
    • No more items.
    Working...