I have this kind of tv model ru-52sz30 and same problem which i fixed by replacing the bulb. there is an access door at the back of tv that you can replace the bulb. if you need more help just post reply again.
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It has you Posted as a projection TV and Not DLP, if Fan to Lamp stops running set will shut off to protect Lamp,I had a DLP that would play sometimes 30 mins then shut off drove me crazy trying to firgure it out and it turn out to be Fan would stop running I replaced Fan TV working fine . When you remove back engage toggler switch to up position put a piece of tape on it to hold it is a safty switch ,then turn tv on watch to see if all fans are running also if when tv trys to come on is there a spark coming from Ballast Board if so your new Lamp is defective it does happen if not your ballast board maybe Bad it is what turns on Lamp.If all fans are running Ballast Board.
Your TV is overheating.. easiest remedy is to point a fan at the back of the TV or... clean the inside of the TV, Im sure its full of dust and stuff... this prevents air circulation inside the TV thus creating more heat...
ok lets begin... shut off? ...is the set staying off. NO POwer at all.. does the set try to come on. does the set have a blinking led on front. have you tried unpluging then waiting 30 min then trying to turn it on again.. this set has a processor and when it detectect any fault will shut the set down
Sounds like the capicator on the high voltage is swelled,removing the back cover,make sure to unplug the unit first,there is a u shaped heat sink about middle ways of the board,inside that heat sink is a cap,it will be swelled on top of it,its a 2200 35v cap.