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If you have the original remote, go into the menu settings and see check the sound configurations. It is possible that your friend had turn off the tv's internal speakers so as to utilize a hometheater system.
On most Mitsubishi's there is a button on the front panel (behind the door) that will allow a A/V reset to factory specifications.
With your particular model there are to modes of reset. The first one doesn't do a complete reset, try that one first. On the front panel behind the little door there will be a button that says: "System Reset" it's recessed to you need a pencil or a pen to push it. Push it, let the green light flash for up to a minute and then turn your set back on. If that doesn't cure your difficulties then you can use a hard reset (like rebooting your computer) by pressing the Guide Button and the Format button at the same time and it will reset itself to original default factory settings.
Your set uses two convergence amp ICs they should both be changed their numbers are STK394-250 They are attached to a large heat sink the board location numbers are Q751 and Q752 You can get replacements at the following link and they provide installation instructions and free on line tech support by insatant messageing when you do the repair. Heres the link http://servicemanuals.vstore.ca/
I have a wild guess. I have the same tv and channel 72 is the proper channel to watch tv on. I don't know why, but maybe try channel 72 instead of the usual channel 3. Good luck, maybe a quick fix, maybe not!
I've seen this problem before with Toshiba sets. Normally it's been caused by the hyper module.
Usually, the set is worst when first turned on and clears up some, if not completly after it warms up. The problem does get worst over time.