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The dark rectangle appears because you have the closed captions on and set to TEXT. Closed captions set to CC1 puts the words on the screen and TEXT puts a black box on the screen. Go into the menu, navigate to the page with closed captions and set your captions to OFF.
Zenith's service site lists a manual for a model IQB36B42W manual, and it will probably be close enough. But the site is pretty lousy. You can't just download the manual; you have to view it on the site. The manual is in djvu (deja vu) format, and Internet Explorer is required so an activex control can install a viewer your computer. It doesn't work if you try using Firefox like I do, and I don't know if Google Chrome will work either. But if you want to jump through all the hoops you can see if the manual helps.
You can also try calling LG Electronics customer service at (800) 243-0000. They own the Zenith brand now and maybe they can help get you a copy of the right manual.
i have the solution. common problem. it has a pip module with defective (leaky) capacitors. they are surface mount capcitors. mcm has a mitsubishi pip module repair kit order number 32-11755 $14.95. 1800 543-4330 customer service 1877626-3532. www. mcminone.com
When you go into the menu to choose the PIP source the PIP comes on to confirm that a valid source has been selected. It is normal for the PIP to close when the menu is exited. To display the PIP normally you will need a remote with a PIP button. Most universal remotes today have PIP functions but if you get a Zenith original replacement then you are guaranteed to enjoy the other PIP features such as size, position, freeze and swap.
your problem is in the horizontal sweep and its called blanking. it happens on mostly zeniths sets as Ive seen it a few times and the only waty to fix it is to replace the entire chassis as there are no parts for zenith available just the module as a complete assy. Basicly, The blanking is suppose to only blank the top and the bottom of the fields of the screen that you don't see but it misfires and causes all sorts of lines, squares, and boxes on the screen. When i first was told of this problem i thought the same exact thing?? About the closed caption but the set came into the shop and didnt do the problem. I thought the customer was seeing things. Then finally on night late I CAME BACK TO THE SHOP TURNED ON THE BENCH AND THERE IT WAS!!! i SAW IT WITH MY OWN EYES!! I replace the Module and all was good. Thge repair was about 175 bucks. Good Luck in your repair. Oh this should not be attemted by a handi person, as there is dangerous high voltage inside these sets.