BEOVISION MX4000 , NO POWER , ADVICE PLEASE

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • zen
    Badcaps Veteran
    • Apr 2011
    • 511
    #1

    BEOVISION MX4000 , NO POWER , ADVICE PLEASE

    Hi all

    This B & O CRT TV is firing up , HT rises to 153V , with just a rustle of EHT , then shuts down.

    If the on board button is held ,PSU pulses.

    Removed line O/P transistor & used a 100W bulb as a dummy load , but still pulsing with button held .

    Anyone know this set well enough to help distinguish whether i'm looking at a PSU issue or not ?

    Depending on design PSU might be shutting down due to not receiving feedback .

    Schematic may help
    ​
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

    Tags: None
    Previous template Next

    Related Topics

    Collapse
    • Ady2017
      SMD fuse soldering advice please
      by Ady2017
      Hi all. I need to replace an SMD fuse on my camcorder and this is the first time I have had to do any SMD soldering so your advice would be appreciated. Below is a picture of the board that I am working on and I have highlighted the fuse that needs to be replaced. I managed to zoom in to take this picture but the fuse is really tiny and is sandwiched between other components so this is going to be a new milestone for me. I appreciate that I am going to have to buy a new soldering iron if you could advice on what I need please. I was thinking about putting a big soldering iron across the whole...
      1 Photo
      11-07-2025, 12:03 PM
    • chazzo
      CH341 programmer advice, including jumpers seemingly reversed
      by chazzo
      I’d appreciate some very basic advice on CH341x programmers. I know this topic comes up from time to time, but stuff changes, so I hope a refresh is in order. In particular, I see some unexpected things happening with jumper positions.

      [My plan is to learn to read and write 24CO2 EEPROMs via I2C. The first target is the one in my Uni-T clamp meter, but before tackling that I have some brand-new EEPROMs to practice on.]

      I have two basic Chinese programmers. One is the blue board with a CH341A and two rows of pin headers. To my untrained eye it looks like all the others....
      10-12-2025, 08:15 AM
    • Jidis
      Need T-Con Advice (Vizio P602ui-B3)
      by Jidis
      Hi all,

      I made a big-ass mess here of my father's beloved P602, and I'm trying to figure out if I should order a batch of overpriced ribbons or if I'd just be throwing more good money at the bad.

      He woke up recently to a bunch of white bars going down the right side of the screen. From what I'd seen in these places, I figured the T-con board has gone out or has a bad connection. I took the back off and gently poked at the socketed ribbons and sure enough, got the image back. It was mainly the far left ribbon, and it would snap back to stripes if I let off the pressure....
      09-22-2025, 05:10 PM
    • zlr8r
      Advice on newer EC chip programming eg. MEC5107-LJ BGA
      by zlr8r
      Hey all, was wanting to know what cheapest option is for programming EC chips such as the MEC5107-LJ

      i searched online and found such programmers as the SVOD4, Vertyanov Successor , and the RT809h type but didn’t see this particular BGA EC chips listed? So hoping for some advice here , cheers.
      09-16-2025, 09:54 AM
    • Borse2008
      Seeking Advice: Repairing Dell U3425WE Monitor with Faulty USB-C/Thunderbolt Ports
      by Borse2008
      Hi everyone,

      Looking for some advice or opinions on what to do with a monitor issue I’ve run into. Apologies in advance is this crossovers a few forum categories.

      I have a Dell U3425WE, which I've recently replaced with another model. That said, the original unit is still fully functional in terms of the display — it works perfectly over HDMI and DisplayPort. However, the USB-C and Thunderbolt 4 ports have stopped functioning correctly. The Issue:
      • The 90W Thunderbolt 4 port (circled in the photo) no longer charges or powers any device, including laptops or MacBooks.
      • There’s
      ...
      07-15-2025, 04:55 AM
    • Loading...
    • No more items.
    Working...