Hi and welcome to justanswer.From your description and a well known problem from mitsubishi , i can guess that your tv is a DLP projection tv.This is a common problem for this serie of mitsu. tv`s and it has to do with the DLP chip going defective.Usually this chip will cost around $250 part alone and about the same in labor charges to have it replaced.
I could be more specific if you could look up the tv`s model number ?
I will be in standby, just send me a reply ,and i will be notified and be with you ASAP.
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Hope this help and let me know if you have any questions.Thanks again.
No problem you`re welcome and you can close this post from your end with the ACCEPT button if you are satisfied with my answer and have no other questions at this time.
Also, you will receive an email after this post is closed and there will be a link to get back to me anytime or you can just send a reply here if you have any questions or need help with the repair and i will be with you ASAP.