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You have a bad connector in the lamp. Stop running the TV immediately and contact the company you purchased the lamp from. this is common in older DLP tvs but not in one 5 years old unless you have a lot of hours on it. the connector can crack and arc inside the plug and then melt and smell terrible. It usually very repairable if you can get a ballast for it. the plug is part of the ballast.
A couple of things to check here. When you replace a lamp some TVs require you to reset the lamp hours meter in the settings in the menu (More common in projectors). If you do not do that then it will only run so many hours before shutting off again. If it is that, you should be able to turn it off and have enough time on the screen to reset that. If that is not the case then you should look into replacing your power supply board.
Don't know if this applys to you but if you have purchased anything but Osram or Philips replacement lamp for your DLP tv then this is probably your problem.. The generic is VERY tempting in this recession but in this case generic is poison to your dlp tv... i have a Mitsubishi 60735 and went thru 2 generic bulbs when my tv kept shutting down on it's own and the lights on front would flash, i could cut it back on for 10 minutes then flicker and shut down again ..well since the bulb was new i thought it may be defective so i got is exchanged for another one ... after all of the post i have seen how much repairs were going to cost on dlp sets no matter what the problem was ..i was ready to chunk the tv out the door when the second lamp was doing the same thing.....!! well a last ditch effort to save my tv before i trashed it or taking it apart to dissect it.. was to buy a brandname lamp ... in my case i purchased a Philips ..it cost twice as much =/ ..i could just return it if it didn't work.. well it was the generic lamps that was causing trouble.. the brandname worked perfectly .. i am just glad the generic lamp didn't do any damage to my TV!!! I have done further research on the generic lamps and realized that the damage it could have done was not worth the money i saved when i purchesed it... Generic is a great deal In some cases (household cleaners, etc..) but in this case GET THE NAME BRAND!!!! the only name brands i know of for these lamps are Philips or Osram/Sylvania.. hope this helps others from this headache. Do your research don't by generic lamp replacements, your DLP set cost to much to risk it.
Dlp tvs have dark pictures,first thing u must be alway change the tv projection lamp.Specially,if u bought used,because u don't know how long the projection lamp been inside that tv already.After u change the projection lamp,still have problems or hear alots of clickings sound too.This problems the board call the Ballast board is it dead too.This Ballast board only job are just to ignite the tv projection lamp only.
Maybe it's time to replace the lamp, have you ever changed the lamp on the TV before? If not, I recommend you do it, because it might be the main issue. Another thing can be the inverter board but you'll never know until you put another lamp in the TV and see for how ling it works, If it lasts less than 4 months, it will definitely be that board.