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Surface mount component in receiver likely to fail/respond to being hit?

Discussion in 'Electronic Repair' started by TwoBearCatz, Jul 24, 2007.

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  1. TwoBearCatz

    TwoBearCatz Guest

    OK, This is a long shot and I'm not an electronics expert by any means
    but here goes.

    I've got an older NAD surround receiver that has started to break
    down. Basically it seems the left front channel in particular was
    giving out. Strangely enough, I found through another post on the
    Internet that you can temporarily fix this by banging the receiver on
    the one side. Naturally, I thought bad connection but after taking the
    cover off I can't see any bad connections.

    However, I *think* I have narrowed the problem down to one board with
    a few surface mount components. It seems that when I tap it with a
    screwdriver it affects the sound. In particular there is a crystal of
    some sort on this board along with some IC's and other components.
    Again, I don't see any bad solder joints.

    Is there any component that is likely to break in this way? I was
    thinking maybe the crystal, but I have no idea. I can put up pictures
    of the board if it help. TIA for any help!
  2. N Cook

    N Cook Guest

    It is a recurring problem in radios for silver migration around the edges of
    the ceramic plates in 3/5/6 pin ceramic resonators to cause problems and
    also people banging xtals with screwdrivers ;-)
  3. Arfa Daily

    Arfa Daily Guest

    Also the board connectors - particularly if it is a mother / daughter board
    scenario. Ifyou have really pinned it down to that board using a fist,
    hammer and chisel, you should now be able to refine the search down to a
    specific area, and then component, using a combination of heat, cold, and
    the butt end of a Biro pen ... d;~}

    Any SM components can get / have bad joints on them, but you often need
    something with a bit more optical gain than a Mk I eyeball, to spot them.

  4. When you hear hoofbeats, first think horses, not zebras.

    Try variously pushing, wiggling turning etc the controls and switches. You
    may find one or more that affect your problem. "Low-Level" and source and
    tape selectors are notorious for this type problem.

    Mark Z.
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