Tv shut off and wont come back on

If you look the set up on ebay

37results for HLS4266WX XAA

The analog board is usually at fault when that happens with that model.

a bad power supply is most likely cause of this. Other possible cause is bad main circuit board.

Bad color wheel.

Sound like dead pixels - cannot be fixed, hopefully you have a warranty?

replace the color wheel

The lamp ballast or Color wheel might be the problem. We have experienced both issues with the tv shutting down. Also check the hours on your lamp as it might be getting old.

Chances are that the sensor has gone bad. If you know how to get to the circuit board that it is on, then changing the board would be easier than just changing the sensor.

Look for the computer processor inside the TV. It needs to be cleaned. A can of compressed air will work. The processor is overheating and causing the tv to shut off. Look for the small fan that is supposed to keep the processor cool then remove the dust.

Good luck!

This tv usually if detects a fault will display via leds a error flash code. Refer to Owners manual for What the codes are for. If you go to Samsung Website Copy and paste link for manual.
http://www.samsung.com/us/support/search/supportSearchResultView.do?group=televisions&group_cd=&type=televisions&type_cd=02010000&subtype=dlptv&subtype_cd=02010300&model_nm=HLR4266W&dType=D&vType=R&mType=&model_cd=&menu=download&prd_ia_cd=02010300&acc_ia_fl=N&disp_nm=HL-R4266W

Problem may be lamp is failing or ballast which operates lamp may be Bad. Could also be Temperature fault from Inoperable fan or Color wheel. Bulb of course is first choice of possible problem followed by color wheel then ballast. Color wheels usually will start making bearing noise when they start to fail. Hope this helps.