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Go to the Mitsubishi website, download the upgrade, save it on a flash drive, plug it into your TV, follow directions provided on the website. If you have done this previously, check on website to see if there are any other upgrades, if not, repeat the previous one. This has worked for us. Good luck! Also where you bought the TV may be able to assist you. Mitsubishi will send you the upgrade on a flash drive for a charge.
Just fixed this on my TV today! (after 2 months of the sound intermittently failing to turn on and failing completely yesterday) Go to Mitsubishi-tv.com. Go to support. Enter your model number. You will be directed to the documentation for your model which will include a zip file for a firmware update and a PDF file with instructions for installing the update. This fixed my sound.
Check if it the picture may be just faint. If it is it may be a bad ballast or weak back light. If there is none at all, it may be a problem with the power supply. This is the first circuit after the power chord. There may be loose connections, leaking or swollen capacitors or burnt resistors or the IC or the entire circuit may be bad. This is a common issue with these type of devices. While at it check the rest of the circuit for the same items. There are cases where the problem is with the main board.