Re: Sony KLV 40U100M turns itself on and off at random...
Had the same problem with my KLV-40U100M turning off and then on and it finally died. The repair shop stated the "A Board" needed to be replaced. So far it's still working. The repair cost $440.00, hope this helps.............
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Check the U24 (CPU reset IC) on the "A" board. It may be burned. If you have a DVM (voltmeter) check for 3.3V across SW1 connections near this device. If you don't have 3.3V, U24 is bad. This part is not available from Sony. The TV may work if you just remove U24 from the board. I posted this fix on Agoraquest also, you can read more there (I'm "Roundabout" on that forum). Hope that helps
If this were just about any other brand, you'd likely be able to find another brand of TV with the same size screen and swap the inverter boards and the LVDS board. The problem with Sony is that the company uses internal designations. If you have homeowner's or renter's insurance, it might cover some of the cost. Otherwise, put the damaged set on eBay (you'll get a couple hundred dollars plus shipping) and go buy a new set. Likely, any larger set for sale with a good screen is going to go for more on eBay and finding one is rare.
The resolution on this was to check the surge protector the television was plugged into. Once we unplugged and plugged into another surge protector, the screen went back to normal and the appearance was great. We believe this was due to one of the resistors within the surge protector may have become faulty.
You may want to try a Manufacture reset. To do this you must first turn the TV off. Press in sequence.. Display-->5-->Vol +-->power on your remote(this sequence must be done fast). This should bring up a service menu. Press the number 8 and then Enter on you remote, The set should go off and on by itself. Now go through your setup and try the input again.