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I just fixed one JV-TV2040 monitor that worked intermittently. Turns out the AC power adapter was bad. The wire was cracked inside the strain relief where it goes into the adapter. You can either replace the adapter with a suitable replacement or do like I did and carefully hacksaw the case open, chop out about 4 inches of bad cable, and resolder to the circuit board. I glued the repaired unit back together with silicone glue.
I am sure there is one to download. If google is no help, just ask some deep web specialists, e.g. http://manualfox.com - this is a manual search agency and if they don´t find it, it does not exist in the Internet.
Verticle output transistor. It will be mounted to a heat sink. t should have Verticle stamped on the circuit somewhere near the Transistor. Locate the numbers on tht Tansistor and let me know what numbers and letters are, and i will post a link to where you can buy a replacement.
This sounds like micro glitch try unpluging the tv and all controlable inputs (PC, iLinks, or other such devices) wait 5 min then plug the tv only in and see if you have returned functions. if you should read the manuals of those devices to see if the control functions can be turned off.
if your are a technician , you will be able to do that. remove the back, carefully remove the main board, plug the tv. with the multimeter on DC voltage, check the voltage at that point . If you find a 10V , the capacitor will be 16V, if 12V the capacitor will be 25V. in general the capacitor have to be electrolytic and have more than 470microfard.