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IR remote control - battery drain

Discussion in 'Electronic Repair' started by Beerbarian, Dec 27, 2003.

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  1. Beerbarian

    Beerbarian Guest

    I have a Mitsubishi Black Diamond DVD player (BD30DVD) which works
    fine but it's IR remote control seems to drain batteries quite rapidly
    over time, while not in use.
    I first suspected the cause was dud batteries bundled with the device,
    but I have since gone through a few packs of premium brand alkaline
    AAA batteries, and the same effect is seen with each fresh battery
    change: the remote drains the batteries while lying in a drawer not in
    use.
    I've made sure nothing is lying on top of it to prevent having one or
    more buttons kept accidentally pressed, yet after about a period of
    about 2 months on non-use, the remotes two AAA batteries are dead.
    The player and remote are about 18 months year old, and have very
    little use.
    I'd say I've used it about 6 or 7 times previously, but got gifts of
    DVD's for Christmas and now am anxious to get watching without going
    out to the shops to get more batteries every time! (some functions are
    only available on the remote)

    I've dug out the multimeter and dismantled the IR remote to try my
    hand at some fault finding, and was hoping one of you fine folks might
    give me some pointers as where to begin?
    I won't go into component specifics just yet, suffice to say the
    circuit is quite simple, although the workmanship on the factory
    soldering looks very poor, and already appears to have a bridge wire
    from one track to another, but no obvious shorts.
    I'm just looking for tips on tracing the constant voltage drain, if
    that's not being too simplistic from my description.
    At the moment I'm removing the batteries each time I put it away, but
    the delicate battery covers lock tab has already snapped because of
    the constant use it's got, and I was think if fitting a slider switch
    to give on/off to the device, but I'd really like to get to the root
    cause if I can.
    Thanks for taking the time to read.

    Éanna
     
  2. If I had to guess, some liquid has gotten into the keypad and is
    shorting the circuitry.
     
  3. Jeroni Paul

    Jeroni Paul Guest

    If the remote has an LCD display or some memory in it, that could be the
    cause.

    Beerbarian expuso:
     
  4. It seems to me the first thing to do is to check to see if there is
    battery drain when the remote is just sitting on a table with no keys
    depressed. That is elementary. Then some sharp taps with a blunt
    instrument while monitoring the current drain might show where the
    problem is. :) But, if the DVD had a warranty, has the warranty
    period expired? It usually includes the remote as well as the player.
    What about just getting a new universal remote? For the cost of the
    batteries you have used, you probably could have gotten a new remote.
    I know that that is not as satisfying as fixing the problem, but
    unfortunately we have gotten into a "trash rather than repair"
    economy, as another thread has been discussing lately.

    H. R. (Bob) Hofmann
     
  5. Ross Mac

    Ross Mac Guest

    Hey, Beerbarian, maybe you got some beer in that remote and one of the keys
    is sticking. You might try some contact cleaner that doesn't attack plastic
    to clean them. Make sure to test it in the battery compartment where a
    little plastic damage won't matter. And please, remove the batteries
    first!...Good Luck, Ross
     
  6. Bernard

    Bernard Guest

    Le 28/12/2003 00:48, Beerbarian a écrit :
    Hi,
    a way to know if it's a key which is always depressed, or if the remote
    is always emitting for x reasons, is to put your remote near an old lw
    radio receiver, when on, you will ear clock,clock,clock... in the radio
    because appropriate harmonics pass through the filters of the radio.(
    cf. Fourier series)
     
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