It was without a power supply, and this monitor required an external power adapter. On the back of the monitor I read that it needs a 12-volt power supply. I don’t know much about watts and amps, so I looked for a power adapter for it in boxes that I had previously found in the trash, and I found a 12-volt cube-type power adapter HKA-12100EC-230.
When I connected this monitor to the computer, after a few or several seconds the image would turn off, but the LED on the monitor showed that the monitor was still on. When I turned the monitor off using the button on the monitor and then turned it on again, the monitor would turn on for a few or several seconds and then the im…
It was without a power supply, and this monitor required an external power adapter. On the back of the monitor I read that it needs a 12-volt power supply. I don’t know much about watts and amps, so I looked for a power adapter for it in boxes that I had previously found in the trash, and I found a 12-volt cube-type power adapter HKA-12100EC-230.
When I connected this monitor to the computer, after a few or several seconds the image would turn off, but the LED on the monitor showed that the monitor was still on. When I turned the monitor off using the button on the monitor and then turned it on again, the monitor would turn on for a few or several seconds and then the image would turn off again, while the LED still indicated that the monitor was on. This happened at every resolution. I was already about to throw the monitor back into the trash, but then I thought that external power supplies for monitors and laptops are usually larger than these small cube-type ones and are elongated. So I decided to look for such a power adapter in the box. I searched and checked so that the adapter would be 12-volt and elongated instead of cube-type, and that the plug would fit the monitor, and I found this power adapter:
SAD04212 UV-36. I connected this power adapter to the monitor and the computer, and the image has been displayed correctly for many hours. Apparently it’s not without reason that elongated power adapters are supplied with laptops and monitors instead of cube-type ones.
Why don’t all monitors have internal power supplies installed, so that I only need to connect a cable from the wall outlet, but instead the current has to be reduced—in this case to 12 volts? When two power supplies are both 12-volt, but one is cube-type and the other is elongated, what current parameters differ in the power coming out of these adapters when they are plugged into the wall outlet? What would happen if someone made a mistake and connected an elongated power adapter to a device that requires a cube-type adapter, for example an electric shaver, but with the same voltage as the original cube-type adapter—could the device burn out even if the voltage matched, but because of different current parameters?
This monitor has the buttons ripped out:
I have to touch the metal contacts in place of these buttons with a metal screwdriver, and the monitor reacts as if I were pressing the buttons. There are also two scratches at the top of the screen.