My monitor randomly shuts down internally. Sometimes its only for a few seconds, sometimes for several minutes or more. The screen and all LEDS go black. It then reboots and may go for minutes, hours or days. The power supply is external and feeds a steady 12.1V. The problem doesn't seem to be heat related. I could probably fix it (I'm an electrical engineer) but I can't get the back off! How do I do that (for a start!)
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Hook a spare monitor to the computer to rule out the video graphics card in the computer, and sub another video cord from the computer to the monitor if possible to check your LG monitor, If the display shuts down and power light changes colour or goes out it is a power supply board, one or more capacitors open causing the power to fail, sometimes the top developes a bulge making it easy to spot.
There are 4 c5707/5706 in the inverter transformer driving circuits, the cause of the problem was due to poor solder connection in the bias circuits of the transistors. Make sure to check that after you install the new transistors otherwise you will blowthem up. Common problem with this model. When the circuit drwas too much power from the power supply, it will shut itself off to ptotect itself.
Usually when an LCD display shuts off on it's own this can be a power supply issue. I would say if you checked all the connections you may want to contact the manufacturer. If it is only a few months old then you should be able to get it replaced under warranty.
Also, you may have an auto shut off feature enabled on the display itself. You may want to go through the display's menu to very that this is not the case.
Monitor going black after a few seconds can be caused by a faulty power supply or inverter. Some monitors have both as one unit.
Sometimes it is basic failed capacitors, After that then I would look at transistors.
The average monitor from 17 to 20 and sometimes the 22s have usually 4
bulbs in them. One bad bulb will also cause the inverter to not fire up.
Bad bulbs usually show pinkish tint, or flickering or are dark at center top or bottom of the display.