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Magnavox TV TP2770C101 ch 27B502 HV Problem

Discussion in 'Electronic Repair' started by Brad Petria, Sep 22, 2003.

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  1. Brad Petria

    Brad Petria Guest

    Hi,

    I have a Magnavox TV chassis 27B502-00AA in my shop. I replaced
    the H.O.T. Q503 # 610597 (on device) which was shorted and the horiz. driver
    Q500 BSN274 # 483513047931 which was bad. I checked the regulated
    B+ which is 131.8V (130V is ideal). The HV measures 30KV when it should
    be 27KV - 28KV. Note: It can't be due to 1.8V high B+ since math shows an
    increase of about 400V (HV). I checked the FBT core and it isn't loose.
    Did you have this experience and what was the cause?

    Thanks in advance, Brad

    Tip for your old computer (reduce discard pollution too):

    If you can't sell your old computer, don't throw it away. Use it to backup
    your software by transferring files/folders from your new computer or laptop
    to it. I transferred my Windows folder and other stuff to my old computer
    using "PC Link", which I downloaded from www.simtel.net (cool site).

    http://www.simtel.net/pub/dl/52792.html (info or download)
     
  2. Asimov

    Asimov Guest

    "Brad Petria" bravely wrote to "All" (22 Sep 03 16:54:00)
    --- on the heady topic of "Magnavox TV TP2770C101 ch 27B502 HV Problem"

    Check the pulse to the HOT base is properly shaped from the horizontal
    oscillator onwards and nicely clipped at the base. Check the peak
    shaping network across the HOT's collector isn't open. Check the damping
    diode if a separate one is used. HV will also rise if zero beam or a
    weak crt.


    BP> From: (Brad Petria)
    BP> Hi,

    BP> I have a Magnavox TV chassis 27B502-00AA in my shop. I replaced
    BP> the H.O.T. Q503 # 610597 (on device) which was shorted and the
    BP> horiz. driver Q500 BSN274 # 483513047931 which was bad. I checked
    BP> the regulated B+ which is 131.8V (130V is ideal). The HV measures
    BP> 30KV when it should be 27KV - 28KV. Note: It can't be due to 1.8V
    BP> high B+ since math shows an increase of about 400V (HV). I checked the
    BP> FBT core and it isn't loose. Did you have this experience and what was
    BP> the cause?
    BP> Thanks in advance, Brad

    BP> Tip for your old computer (reduce discard pollution too):

    BP> If you can't sell your old computer, don't throw it away. Use it
    BP> to backup your software by transferring files/folders from your new
    BP> computer or laptop to it. I transferred my Windows folder and other
    BP> stuff to my old computer using "PC Link", which I downloaded from
    BP> www.simtel.net (cool site).
    BP> http://www.simtel.net/pub/dl/52792.html (info or download)
     
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