DIY LCD monitor issues

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Old 08-11-19, 03:27 AM
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DIY LCD monitor issues

I had an old Dell laoptop sitting around, so I decided to take it apart and use the screen to make my own monitor because it seemed like an easy and cool thing to do. I ordered a control board off ebay and for a power supply I took the old laptop charger (output of 120V, 3A) and put a barrel connector on it. When I turn it on it works beautifully for 1 to 2 seconds then the screen goes black but the "on" LED on the control board stays on. I've seen a few solutions to this, but none of them are in this context and through some trouble shooting I find that their problems are not the same as mine, as I will now detail.

The LCD Backlight
when the screen goes out, it just turns off. The image isn't there but really faint, and I've done the flashlight test and there flat out is no image on the screen.

Spent Capacitors
The only thing I really looked at here is whether any of the capacitors seemed to be bulging out at the top, because I believe that is how you tell if they've been overloaded, and they all seem fine. I don't know terribly much about capacitors, so I don't know if there are any other tests I can run on them. Some people say that turning the brightness down on the monitor can fix this issue, but the screen doesn't stay on long enough for me to go through the menu and do that.

So far I don't know whether the problem is in the screen itself, the control board, or the power supply. when I turned it on the first time, there was no smoke, sparks, strange noises, etc., and I can turn it on and off continually with no change in results. Any help you can post is appreciated.
 
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Old 08-11-19, 09:44 AM
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Welcome to the forums.

I ordered a control board off ebay
What kind of control board ??
 
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Old 08-11-19, 10:46 AM
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PSU vltage edit

quick edit: the power supply has an output of 20V not 120V
It's a control board for the screen. The one I ordered can be found here: https://www.ebay.com/i/182248877941?...SABEgKFd_D_BwE
 

Last edited by aaaaaaaaaaa; 08-11-19 at 10:54 AM. Reason: PSU voltage
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Old 08-11-19, 11:29 PM
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Big, high-res monitors are so cheap these days I don't know why you would bother with such a thing for something as small as a laptop screen.
 
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