Picture overlaid with multicoloured horizontal bars & small rectangles on both TV & DVD. Sound on DVD ok. Switched off awhile, no change.

Check whether the balance control is settings. Go to the audio menu to both TV and DVD player; and make sure that it is set to Centre position; to both the devices. Still there is no audio with one channel, check it with an other know good disc. Still you can't get sound from one channel, the audio output section to the TV circuit should be checked. Contact any service technician.
Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

can you hook up a dvd player? see if you got sound if you do, your TV Tuner is broken

The set has over 150 capacitors that could be causing the problem but it is at least 1 doing this. Contact Mitsubishi. Some people have been able to get new replacment TVs because of this problem

your picture tube is failing

have you tried another dvd player on the set just to rule out that it is that dvd player its probally not worth fixing and i'll tell you why these things are a dime a dozen any more ok good luck

Don't know how I did it. Shut tv off and left it off for awhile put it it back on and picture and sound were OK. Thank you for your concern.

That is the PIP (picture in picture) setting, on the TV's remote control. locate the button marked PIP and press the button, it should clear the little box.

OK I got my first TV, first to repair myself that is, and I have no training at all but am kind of a tech dork wannabe. So I checked and I have sound but no signal through the TV tuner, so I hooked up my Zenith VCR to aux 1 and sound with signal appeared, the VCR tuner still works :) so I am leaning toward the TV tuner. It is visibly damaged, and I'm hoping it is as simple as a broken connection. I also noticed a vertical flash and pattern of horizontal lines when it is turned off (white). sooooo I push on.... help!!!!!!!!!!!!! :>}

If PIP works, have you tried to swap pictures. You may have a tuner out.

This set does have a video problem. If it was bought locally, then, the retailer may have a 30 day return policy. If bought online or cannot be returned, then, contact Sony, for a service center in your location: http://eservice.sony.com/webrma/web/index.do Either way the set is to new to have a problem and you should get it resolved as soon as possible.