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Thomson set-top box

Discussion in 'Electronic Repair' started by Graeme, Apr 28, 2004.

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  1. Graeme

    Graeme Guest

    Thomson set-top box for UK freeview reception. Model DTI 1000.
    This unit (not mine) keeps blowing its internal fuse. From what I've been
    told, this only happens on power-up. The fuse that I've removed is a
    standard 1A 20mm type. Does anyone know of the cause (is it typical for this
    model), or what the recommended fuse rating/type should be (marking on the
    circuit baord next to fuse is "T1AL")? There are no obvious damaged
    components inside.
  2. David

    David Guest

    Send it out for service to Thomson. Even here in the US the set top
    boxes have ZERO information or parts available, they must be shipped
    to the manufacture as they are keeping tight lids on the technology

  3. Peter Duck

    Peter Duck Guest

    In message <c6o841$e0elh$>
    Dunno about the 'L', but the 'T' prefix is 'Time-delay': by 'normal' you
    may mean what's also known as 'quickblow' or 'F' to distinguish them
    from 'T'.

    'T' fuses allow much higher than the rated current for a brief time
    (achieved by winding the fuse on a core of relatively high thermal
    inertia), but only the rated current continuously.

    Such fuses are very usual in equipment that has a high starting-current,
    e.g. to charge-up the capacitors in now-nearly-ubiquitous switch-mode
    power supplies (plus, in a TV/monitor, the degaussing current).

    Readily available from e.g. Maplins, or probably any local TV
    sales/service place.
  4. Graeme

    Graeme Guest

    Thanks for the reply. On further examination of the blown fuse, it also says
    T1AL. So I guess that was the correct type.
  5. Graeme

    Graeme Guest

    I'll check to see how much service by Thomson would cost. It's only £60 new.
    It had been sent for repair before, and all the repair shop did was change
    the fuse.
  6. L. Fiar

    L. Fiar Guest

    Some years back, when I was in TV servicing, there was a TV that was known
    for popping the fuse after some time of use, I believe it was a certain
    Samsung model.
    The standard repair was to fit a slightly higher fuse, as the manufacturer
    had slightly under-rated it. A fuse that is run on it's limit will usually
    sag, and die over a period of time.

    I assume that the repair shop you name at least tested the set before
    returning it, how long does the set last before the replacement fuse pops?

    Have you done a Google search for specific info, whether this fuse is
    becoming a common problem now as the sets reach a certain age?

  7. Graeme

    Graeme Guest

    Thanks for the feedback.

    The repair shop (which is also the place where it was purchased) apparently
    did test the unit after changing the fuse. I don't have too many details
    about the exact history as this unit belongs to a friend, and I can't say
    how long a new fuse lasts. I do know that the shop no longer exists now.

    I did google for problems with this box, but haven't found anything similar.
    I also emailed Thomson.

    At the moment it's running with a 2A fuse.
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