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This caused by the captions, get the remote, press menu, scroll down to captions, right arrow press 1, 2, 3, off when the cursor is over the off press enter on the remote and that should get rid of the black box.
Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board will get ur picture back.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter backlight board for the replacement.It a long board in shape.
According to Mintek customer service they know about this design problem. If the TV is still under warranty you'll need to call them for an RMA and ship the TV to them [at your cost even though it's their bad design] for a replacement. They didn't impress me with their service and it took me a few months to get everything squared away. Because of all the problems I had with them I will not recommend their products to anyone.
My mother-in-law had this problem on a Quasar for two years before she finally mentioned it. The rectangle is a text box for closed captioning or for a demonstation list of features, but without the text. I restored the factory presets and poof... problem solved.
Look in the manual and find how to restore the factory settings - it will probably be some weird combination of buttons that you would never guess. On her set, which has a built-in VCR, it was simultaneously pressing "play" and "FF" (on the set, not the remote) for five seconds until the set powered down. Yours will probably be something different but equally odd. That should get rid of the black rectangle. Then you go through the initial setup and you're back in business.
I had purchased Mintek Mdtv 265D , after Reaching Home (India) Tried to switch on the syastem but Screen Doesnot get on, as Per local expert the pwer supply having some problm, The same Set purchased in Month Sep 07 from Somewhere in US
Now the same is in India , how to repair and get rid of this problm