Mitsubishi 73" wd-73740 no picture or sound and red light on front

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

I had this problem with a laptop of mine it's the led just replace the screen

Try checking for a blown fuse where the power cord enters the TV. Please unplug first.

Try replacing the lamp. part# 915B455011
see website: http://www.shopjimmy.com/dlplamps?tv_brands_select=Mitsubishi&tv_models=Mitsubishi+WD-73740

Have you still got your manual with the troubleshooting pages? If not I recommend that you look for your manual here:
Free User Manuals and Owners Guides ManualsOnline com
it is good to have the serial number and the make handy
kolbrun

Bulb is blown. Easy fix. Check owners manual and buy the bulb on ebay

means u need a repair guy,lol, they are usually worth their time.

try the lamp.
part# 915B455011


see website:

http://www.shopjimmy.com/dlplamps?tv_brands_select=Mitsubishi&tv_models=Mitsubishi+WD-73740

sounds like the psu. power supply unit. check the caps are not bulged

lamp needs to be replaced.