Do u know the dimensions of the rear projection/it quit working

http://www.retrevo.com/support/Mitsubishi-WD-52527-TVs-manual/id/276bh928/t/2/
Click on download manual.

hello my name is rico i work on tvs sometimes. is your blue or red crt broken if is not you dont need to replace it need change the coolant inside the tube. if you need more help with it let me know ta anytime my phone number is 602-810-7149 i live in mesa az

if I was you , I would get on E BAY!!!! I have a 52 inch mitsubishi tv. and thats where I go when I need parts. via bulbs and power equipment!

Call Mitsubishi the chassis needs to be rebuilt on this set they have been paying for the parts but you will have to pay the labor.

The convergence ICs and resistors need replacement. The DPTV305-345 convergence repair kit works for most Phillips rear projection Tvs. The kit contains the two ICs 12 resistors and the CD with detailed instructions
http://www.tvrepairworld.com/

that means your lamp it is getting to the end of its life.
sometimes even if the lamp still good the TV will send you that message because that timer is closed to 5000 hours

What you can do is open the lamp door, closed again and the tv will ask you if you replaced it the lamp, and just say yes and that sign will go away

or just simple replace the lamp. 915P020010

disconnect the connector for the front switch control board. Try turning it on with the remote. If it works replace that board, also look for bad caps on the small signal board. they're 1000Mf 16v

Press the Menu Key on your remote. If your menu shows clearly on the screen, then there is a problem with your source.

take it to home depot and have the cut one to the same dimensions you will have to paint the board on it but its still cheaper than one from mits it just clips off you have to remove the corners on the top of screen

Yes, first do self test here in threads or at ctechnicians.com