Some components in the TV, and most likely in the power supply are starting to become temperature sensitive. Some Capacitors tend to become this way when they age. To find the temperature sensitive caps that are failing it will take a very experienced TV or electronics service person with a supply of liquid air and a heat gun to thermo test. He will also require the proper test equipment to verify. The big service centers should be able to troubleshoot for this, but the time involved and the cost of the parts will be expensive. If the set is out of warranty, it would be more feasible to get a new one!
SOURCE: iNSIGNIA 26" FLAT SCREEN MODEL #246ALC27FB26006527
These LCDs have a feature to turn OFF after some time if they do not sense any signal getting into the TV, that is why when you use it as a PC monitor and leave ON; it will turn OFF by itself.
The short term solution to make the LCD power up properly when using it as a PC monitor would be to unplug it when it turns OFF by itself and plug it back in.
Let me know if you need further assistance.
SOURCE: LG 47LC7DF LCD TV Remote Sensor not working
IR senor may not be bad. Try using a different remote (universal) and program to TV. If universal remote works and your doesn't, you may need to purchase a remote instead of IR board. If you confirmed that the IR board is bad then replacing the IR board will fix the remote issue. IR board is an easy fix. Just open the back cover out and it's located right in the middle toward the bottom of the TV.
SOURCE: monitor worked fine for years, then permanent standby
hey
usually this happens due to static try to power cycle the monitor by disconnecting all the cables from the monitors
then connect teh cables back one by one
and see if it works and if not yes get teh monitor replaced
SOURCE: power supply problem
mine did this and it was the power supply like 140 bucks from the best buy parts search
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