Trashed LCD monitor turned into a light box

light-box-from-lcd-monitor[x2jiggy] was given a non-functioning LCD monitor. He made a small effort to trouble-shoot its inability to display anything on the screen but couldn’t get it working again. When that failed he decided to repurpose it as light box instead of just sending it off for recycling.

Monitor manufacturers put in a lot of effort to make sure the back lights distribute brightness as evenly as possible and that will make this a pretty good light box. [x2jiggy] starts off the conversion by removing the case. While it was off he gave it a new coat of paint. The LCD panel, the PCB that drives it, and the light diffuser sheets were all removed, leaving just the backlight and inverter PCB. A bit of probing with the multimeter and he even found a place to connect a toggle switch to actuate the inverter’s power. You can see the silver switch he added to the bezel in the image above. The full build video is embedded after the break.

Comments

  1. Great, i’have done this to two of founded/restored lcd panels, but i trow away cold catode (lightbulbs anyway) and add led stripes, one 15 inch panel i power by batteries and use a lot in photography and video making, other is powered by brick and sit near my window, after dark i use it as fake sun for reading books, i love it!

  2. buran says:

    great! :)

  3. Hirudinea says:

    It would be interesting to adapt this technique to a busted LCD tv for a room lighting.

  4. Never seen this done before! Such a great idea, can’t wait to raid my junk pile at work!

  5. Vonskippy says:

    Neat.

  6. SHA da Vinci says:

    Recently I had to replace LCD in my laptop and I’m thinking on similar solution (only I’m building own bezel/case with plywood). I promise – I will show after it’s done. The only thing – I’m stuck with lack of inverter (got new screen without one and laptop is using same inverter). Is there any key with inverter models or I need to find identical one?

  7. Andy says:

    Cool, yeah this is a great use for those old things. Here’s a project we did with one:

    http://www.instructables.com/id/Paint-Pulse-Digital-Water-Marbling/

  8. Jerry Tremble says:

    Great idea!

  9. Nova says:

    I can’t believe the timing on this. I was literally thinking about this yesterday as I have two broken LCD monitors on hand. For some reason I dismissed it because I thought the diffuser needed to have the light source further away but I guess that’s not the case, time to get to work!

  10. Alex says:

    I don’t know if he mentions in the video, but without the LCD and polarizer and junk, the backlight is *very* bright. This is good news because even an old crappy dim LCD is likely to have bright enough backlighting for this sort of task.

  11. Rod says:

    Nice hack. For those thinking about doing this hack there is a good LCD monitor teardown here : http://www.eevblog.com/2013/05/01/eevblog-465-led-lcd-panel-teardown/

  12. Rom says:

    Beside of photography, what can it be used for?

  13. BotherSaidMayans says:

    Nice hack, I usually find that “no display” can be the SMD fuse on the monitor’s display PCB directly behind the screen or simply bad capacitors.
    No backlight can be the same, sometimes the C5707 transistors also blow.

    Have you considered using multiple coloured filters on each backlight and making an RGYB variant of this?
    A simple gel filter in front of each tube should be fine for photographic use.

  14. pete says:

    Nice!

    I built a light box using the waveguide (a big chunk of (PMMA?)) from an old LCD monitor. I didn’t want to muck around with high voltage or CCFLs so I bought a set of LED strips (DIODER from IKEA). I just taped the LED strips onto the sides of the waveguide and stuck a bit of tracing paper on top to scatter the light. It works really well, is low power/voltage, and really really thin – about 5mm.

  15. dave says:

    where did you get your power from. 1500 vac? did you just guess where to wire the switch? seems like youd need to do some checking with a meter before demo.

  16. dave says:

    seriously, how did you know. ive got a set of lights, appropriate inverter and corresponding power supply.but thats it. no wires andi dont even know what kinda tv it was.

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