I found this on another site..
Looks like pixels are appearing due to the failure of TV's main board. There is no "reset" button at all. the problem occurs due to fatigue failure of solder joints under main board's microprocessor. Technology has changed, but not in our favor! At computer motherboards, there is "zero insertion force" plug, which connects "micro" to the main(mother) board. It allows I.C. chip to be well connected to the circuitry, despite the difference in ambient temperature. Latter makes of TV's main boards using laser soldering of 100+ contacts to flat board via led-free solder alloy. after numerous cold/hot/cold cycles, the alloy becomes brittle and fails to connect all the pins of "giga chip" to the board. Plus: there is no such thing as a cooling fan or, even basic heat sink in most brands. "Disposal" technology! The only way to cure the problem is to replace main(signal) board, if your set is less than 3 years old. If more, there is a possibility of bad capacitors in a power supply. If the set hesitates to start up cold, that's the issue. But...? Couple month ago I did replace main board in 46" Samsung LCD Panel, due to the same reason. Looks like you are up to repair your set. whether it's a panel or D.L.P. the problem is beyond "reset"! It will only get worse over the time. Call for service or give me your model#. I might help you with part search and replacement procedure.
I wonder if this is my problem?