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Sanyo AVM2502... snow

Discussion in 'Electronic Repair' started by mrat, Apr 30, 2004.

  1. mrat

    mrat Guest

    I picked up this Sanyo AVM2502 which is around 21" out of a pile of
    junk, I figured it was junk and that's why it was there, anyway. When
    I got it home and plugged it in I surprised to find out that it
    worked! the only problem is that every channel is snow...

    I've read around and it sounds like the problem is with a part called
    R508. I have no clue what this thing looks like or where it is. I also
    have never worked on a TV before and am hoping that a jiggle,
    resolder, or replacement would be all that is necessary.

    I've searched all over the net for a schematic, or other tips, or
    mabye even a picture but to no avail.

    I've read that working back there can be extremely dangerous because
    of the capacitors discharging etc.. and I would like to know if
    leaving the TV unplugged for three days is enough to create a safer
    environment.

    I read that the R508 is located around the center to the left, from
    what I can tell, it is the first place that the input cable runs to
    and it stands up on end above most of the other parts. could this be
    it?

    thank you for any help!
     
  2. David

    David Guest

    STOP NOW before you hurt yourself.
    Honestly, if you have no clue what a resistor designation is or what one
    looks like, you should NOT even attempt taking the back off the tv set.
    David
     
  3. Jerry G.

    Jerry G. Guest

    I would strongly recommend you not work on the set. This is not a safe
    undertaking. You are also trying to service a set based on "hear-say". The
    tuner, IF, or ACG amp sections obviously have a defect somewhere. The set
    was tossed because a repair like this can be fairly expensive in relation to
    the value of the set.

    The tuner and IF module are normally replaced as a replacement module,
    rather than serviced, unless the fault is very simple. A new tuner module
    alone can cost a fair amount to replace.

    If you see the station, but it is snowy, this is usually low RF gain. The RF
    amp stage may have failed, and or the RF AGC circuit has faulty components.
    The service centres are able to properly diagnose these faults, and
    determine the proper parts to change.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    I picked up this Sanyo AVM2502 which is around 21" out of a pile of
    junk, I figured it was junk and that's why it was there, anyway. When
    I got it home and plugged it in I surprised to find out that it
    worked! the only problem is that every channel is snow...

    I've read around and it sounds like the problem is with a part called
    R508. I have no clue what this thing looks like or where it is. I also
    have never worked on a TV before and am hoping that a jiggle,
    resolder, or replacement would be all that is necessary.

    I've searched all over the net for a schematic, or other tips, or
    mabye even a picture but to no avail.

    I've read that working back there can be extremely dangerous because
    of the capacitors discharging etc.. and I would like to know if
    leaving the TV unplugged for three days is enough to create a safer
    environment.

    I read that the R508 is located around the center to the left, from
    what I can tell, it is the first place that the input cable runs to
    and it stands up on end above most of the other parts. could this be
    it?

    thank you for any help!
     
  4. mrat

    mrat Guest

    Consider it junked.. :)

    matt
     
  5. Chaos Master

    Chaos Master Guest

    mrat bleeding:
    What if you connect a VCR to it and use the VCR as the channel tuner?

    []s
     
  6. audiogeeb

    audiogeeb Guest

    I tried hooking up a VCR to my SANYO AVM2502
    and it is still just snow on all channels. Using the VCR tuner is a
    no-workie.
     
  7. Chuck

    Chuck Guest


    I believe this set has the 39k or 33k1/2 watt resistor that opens up
    on the main board. If I remember correctly, the number is R108. It
    is usually located a little to the right of the flyback. Any
    competent servicer should be familiar with this problem. Chuck
     
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