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LCD Monitor Backlight

Discussion in 'Electronic Repair' started by Charlie, Jun 8, 2009.

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  1. Charlie

    Charlie Guest

    My monitor is an LG L1932TQ-BF. as I was reading the screen the brightness
    flickered and the screen went dark. If I power down and then back up, I get
    a very brief well lit screen with "normal" text showing. It lasts less than
    a second. The power light comes on normally and changes color when a video
    signal is there.

    I have not had the need to get into the guts of an LCD monitor.

    What sort of precautions are to be observed when replacing the light(s)?

    I have fixed almost everything else electronic in the past. I have done CRT
    TVs, PC's, Microwaves etc. What I need is a road map before I open it up.
    Are there any good sites with directions and are there any preferred
    suppliers of replacements.

    I know I could just Google this but it is always better to get advice from
    someone with hands on experience.

    I could run out and get a new monitor, but as a retiree I have more time
    than money.

    Charlie
     
  2. Tim Schwartz

    Tim Schwartz Guest

    Charlie,

    While I'm no expert on monitor repairs, from what I've read the problem
    is more likely to be with the lamp power supply rather than the lamp(s)
    themselves. They are often some sort of switch mode supply on a small,
    separate board that the lamps connect to. If you are lucky, you'll have
    bad capacitors, if less lucks, a bad coil or transformer.

    Regards,
    Tim Schwartz
    Bristol Electronics
     
  3. Charlie

    Charlie Guest

    First of all, thanks for the responses. As I started getting educated I
    realized that the inverter could likely be the culprit.
    While the tubes aren't too bad the inverters turn out to be a relatively
    expensive item. Then there is the problem of diagnosing which part had
    really failed.

    Secondly, I started pulling out the paperwork from with receipts, warranty
    information etc.

    The GOOD NEWS.

    The backlight warranty is 3 years and does not expire until 12 days from
    now. A replacement, albeit refurbished monitor, will be shipped to me as
    swap with the bad unit. How's that for cutting it close? The more likely
    scenario is that the warranty ended last week.

    Thanks again.

    Charlie
     
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