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ARCHIVED FORUM -- April 2007 to March 2012
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This is the first Archived Forum which was active between 17th April 2007 and 1st March February 2012

 

Latest post 09-02-2008 10:26 AM by ipaul. 4 replies.
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  • 09-01-2008 3:47 PM

    • Maurice
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    "its not dead its resting" to quote monty python beovision avant

    Reply Contact
    I wonder if you may be able to shed a little light on a fault i have on my beovision VCR 28" type 8133. At present it's showing no sign of life at all, i have gone into the fault flow sheets from this sight the fuse on PCB 60 is ok. I am getting a supply current to the smoothing cap "450V"on The Main Power Supply PCB 4 as it charges up ok (about 370V) when i plug in the mains lead. Ive been told the fault is the starting circuit, on the fault flow fault chart it mentions, 14P10 pin 11 to pin 1 approx 8 volts specified i read about 1.5V DC,and 14P10 pin 11 to pin 2 approx 5V DC i read .5V. Obviously i'm not even getting enough for the start up to work do you have any suggestions as to the possible likely suspect. Also do you have a circuit diagram i could have a copy of of PCB 14 & PCB 4 if at all possable to help with fault tracing.Regards Maurice
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  • 09-01-2008 7:14 PM In reply to

    • 9 LEE
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    Re: "its not dead its resting" to quote monty python beovision avant

    Reply Contact

    "Dillen or Nobby for this" springs to mind - but i know we have plenty more 'whizzes' on here that can help.. Big Smile

    Lee 

    BeoWorld - Everything Bang & Olufsen

  • 09-02-2008 9:30 AM In reply to

    Re: "its not dead its resting" to quote monty python beovision avant

    Reply Contact

    Dillen do not work on tv or video!

    Die Bogner also called Martin does.

  • 09-02-2008 10:09 AM In reply to

    Re: "its not dead its resting" to quote monty python beovision avant

    Reply Contact

    Yes... but i'm working only on MX types, i dont have experience on Avant's for repair.

  • 09-02-2008 10:26 AM In reply to

    Re: "its not dead its resting" to quote monty python beovision avant

    Reply Contact
    Hi, i have diagrams and stuff, the old type (T81xx) Avants are btw remarkeably alike MX chassis.
    Before 'digging in deep' it sounds like you have a short circuit somewhere on the secondary side of the power supply which makes the voltage drop.
    My first suggestion would be to check the HT transistor (and capacitors/diodes around it) for short circuit.
    Actually, measure with ohm meter the load on the +140 (-something) secondary powerline.
    If this shows no unusual low resistance do the same on the other secondary powerlines (+8, +15 etc)
    If the short seems on the +140 (or 140-something, don't know exactly by heart) than check that HT circuitry.
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