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dim radio station tuner display led

Discussion in 'Troubleshooting and Repair' started by doc2x, Jul 21, 2011.

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  1. doc2x


    Jul 21, 2011
    I have an old Sharp SG-950CD audio system (CD-radio-cassette-phono), and the AM-FM radio station tuning display led has become very dim. The system tunes OK, and the numbers, etc are there, but they can barely be read. What does this usually mean? Thanks.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Depending on the type of display, it may be something as simple as the bulbs which light the display having blown.

    This often causes the lighting to be a little uneven too.

    Can you post some pictures of the display so we know what type it is and what the likely faults will be.

    Many years ago my father had a reel to reel deck which had the VU meters lit by the glowing filaments of the tubes behind them!
  3. doc2x


    Jul 21, 2011
    dim radio station tuner display LCD

    Great start! I mean LCD.
  4. daddles


    Jun 10, 2011
    If it's an LCD, that can be bad news, as they're known for not having long-term reliability. If someone doubts this, I've experienced it first-hand on Fluke meters. Plus, if you read Fluke's "life-time warranty", you'll see the LCD is the main thing they don't warrant for longer than 10 years.
  5. Resqueline


    Jul 31, 2009
    The PCB-to-LCD interconnecting thing may become poor at conducting the signals to the LCD, the LCD may shift its position, or backlight lamp(s) may go out.
    I opt for the last one here. These combo decks used to have one or two bulbs for backlighting. Most often a stupid design, & usually a pain to replace the bulb(s).
  6. doc2x


    Jul 21, 2011
    Thanks to all for the answers!! It was the backlight bulbs as you said. Thanks again.
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