With no power supply, but I do not need the inverter, is there any way I can just run the screen without a psu?…
It takes 12v at 3A, I am guessing that most of that amperage goes to the inverter, which i dont need, but I do have a couple other 12v transformers that run at lower amps, 510mA and 200mA, If i take out the inverter will that work?
the power supply not only powers up the LCD screen, but also the light-source of the screen. I have two separate LCD monitors taken apart and each has a different schematic.
in one of them, the power for the lights connect to the psu, and then there is a ribbon cable connected to the LCD controller. On the other one, the power comes in DC (via a transformer) and there is only one board that both the LCD and light source connects to.
If you want to just power up the LCD controller, you should identify the chip and part # and then see download the datasheet and see what type of power it needs. when i was playing around with small LCD screens (removed from cell phones), the epson controller chip required 3.3V. So I got a voltage regulator and powered up the screen and it did indeed work.
Like Nima, I don’t know, all you need to make it work is the VGA controller (I call it this way because it’s the component which allow you to display images on the screen). But sometimes you can’t separate the boards. If you can then it will work with a small 12v psu that run at low amps. On my old screen, it worked this way :
The inverter board and the VGA->Digital converter are on separate boards, but the VGA board has the output to the inverter where it converts god knows what voltage into like the 30kV needed to power the Flourecent tubes.
All I need to find out then is that if I can find the chip on the VGA board that just controls LCD output (5v maybe?) Errrr, I need to use my dads multimeter again…
EDIT:::::
What did you do with the backlight? Mine says DANGER MERCURY INSIDE on the back and I am afraid to take it off as it might break, but if it doesnt, I dont want it sitting in my basement wait to break, but I dont want to call the EPA or whatever and have them dispose of it. Is it possible I can just chuck it out next garbage day and let the compactor truck crush it, releasing all of that mercury into the atmosphere?
Yeah, I think using a voltmeter is a wise solution. Concerning the backlight I still have it, but there is no risk with mine. I don’t know how it works in your country, but in France there are places where you can give this kind of stuff and it’s free.
Flourescent light bulbs contain mercury vapour inside which can be released if the bulb breaks. If you do break the bulb, leave the room for about 15 minutes, then return with a dustpan and a broom and sweep up the glass and powder and put it inside a sealed container. Then you should recycle it.
the bulbs in LCD are really small and are not dangerous in of themselves. However, if you work in the recycling plant and come across thousands of lcds and small floursecent bulbs a week, then all together they add up to toxic levels of mercury.
so if you do break a bulb, dont panic, just be thoughtful about how you clean it. Also, never use a vacuum, i heard that they can actually spread the containments.
Back to the LCD, another trick is to see if your VGA board has a voltage regulator and see what it’s rated for. I just googled the regulator on my board which is the LD1086-18. It’s an adjustable regulator so that doesnt help much, unless i calculate how much voltage it is configured for by reading the resistors/capicators.... but you might be lucky and end up with a fixed voltage ouput or if its an adjustable regulator you can figure it out.
well, im building a box-table right now for the LCD, and i’ve taken most of the components apart. Hopefully i’ll be done the box by tmw, re-assemble it, plug it in, then i can check the output.
it’s just right now it’s all disassembled
who makes your LCD screen? my lcd is manufactured by LG, but the chip is made from Philips
i havent experiment with the vision component yet. that is the next stet now.
right now, i removed the back white-reflector sheet (this has to be removed).
i’m waiting for some new IR leds to arrive, i ordered small 3mm led’s because i want a thin acrylic sheet to be overlayed on top of the screen.
i anticipate having to removed the fresnel and the diffuser, but i will removed them once i get the FTIR on top and see if its totally necessary.
i also anticipate having to use IR blocking film over the CCFL strips to cut-down on the amount of stray IR that will come out. I don’t want to go down the route of creating my own back-light, I have a feeling that it is not necessary.
as for the power, i guess i didnt get it in the picture, but the plug from the wall plugs in straight to the board (there is no transformer, so its AC in, convert to DC, then send power to lights and controller)
