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substitute radio display backlight lamps

Discussion in 'Troubleshooting and Repair' started by doc2x, Aug 11, 2011.

  1. doc2x

    doc2x

    5
    0
    Jul 21, 2011
    3 weeks ago I learned on this forum that I needed new incandescent backlight mini-lamps for the LCD display on my old Sharp audio system (Model SG-950CD). It appears that they are not available any longer. The circuit measures 4v across the pins and I figure they are ~50 ma power. Would 6v or 3.6v lamps work? Or what might I substitute for them? Thanks.
     
  2. BobK

    BobK

    7,607
    1,648
    Jan 5, 2010
    LED + resistor.

    Bob
     
  3. doc2x

    doc2x

    5
    0
    Jul 21, 2011
    Sizes?

    About what values should I try?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    I would consider a yellow LED (or LEDs) to preserve the ye-olde look.

    Then look here for more info on driving the LED(s),
     
  5. davelectronic

    davelectronic

    1,079
    12
    Dec 13, 2010
    lights replacement

    I would use led's, 4 volts, you could use white led's or yellow, a series resistor is calculated by follows, supply voltage of the old lamps - the led's voltage divide by the led's current rating. basic example, 4 volts - 2 volts for the led's power divided by its current say 20 ma = 100 ohms series resistor. the above can be ajusted to the led type and power of its volts and current you use. Dave.
     
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