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Hi , I`m JackPerhaps I can help you with this problem but first could you please send me a reply when you see this ?
The green light flashing means the tv is powering up and that is normal but then the solid red light means the lamp has failed .
When was the last time you replaced it ?
Here is a good supplier with a 1 year warranty on the lamp ;
They also have a lower cost lamp with 6 months warranty ;
You can also use this part # ***** if you`d like to do your own shopping but whatever you do , do not buy those cheap $30 or $40 knock offs on ebay or amazon , you will have nothing but trouble with those .
If you need the procedure to replace that lamp then look in the manual on page 70 and on , clck the link here for the manual ; https://www.mitsubishi-tv.com/asset/file/owners_guide/C9-737-837_OG.pdf
If you don`t have any more questions for now then please do take the time to rate my answer by clicking on the star icons at the top, then click on Submit , this is how I make a living and that rating gets me paid for my time.Also note that it will not close this post , you can come back here at any time if you have questions.
Thank you and happy holiday
Manual says RED when the lamp is out and flashes yellow when the door is not closed properly
Download the manual I gave you and look on page 9
By the way , 4 months doesn`t mean the lamp is still good , do you still have the old lamp if it was still working that is ?
If yes then try it , your new 4 months old lamp just failed
Also ,If that wasn`t a cheap lamp then it will be under warranty , just send it back