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OTA stands for "over the air"and for a std TV it is searching for VHF/UHF signals as beamed from satellite. If the antennae is properly mounted and connection don't have any sulpher deposits, then the tuner has to be replaced. As far as the antennae, the basiscs are: Based on this information, you need an antenna that receives high vhf
and uhf. KVIE (ch 9, PBS) and KXTV (ch 10, ABC) are high vhf and not
receivable with the CM 4220. I would recommend the Winegard 7694 or
HBU-22 antennas. The Winegard has higher gain and is a 5 inches shorter
than the HBU-22. Shorter boom length and higher gain will come in handy
with an attic install. However, 7694 is more expensive ($60 vs ~$40).........................................sodeep
significant vertical overscan. It is such that it's impossible to read crawls and such at the bottom of the screen.
I think this problem is a tv problem.
it is due to vertical section.
please change electrolytic capacitor in vertical output section. it will be ok.
it is common problem can be fixed at home & very simple.
All symptoms indicate a problem in the vertical circuit,the first thing to look for will be loose conection on the vertical output IC,sometimes this IC goes bad completly and it needs to be replaced.If you are familiar with soldering electronics you can take care of it but if you are not too familiar you can play it safe and take it to a servicer ,it will be a lot less expensive than if they come to your house.Let Us know how it goes or if you need more information.
Your problem is not a vertical alighnment or size adjustment. No, Im sorry to say its the old vertical output IC and /or the small capacitors around the ic and in the vertical circuit. If you dont have the right tools, like a soldering iron a multimeter know how to read a schematic diagram, then you should seek out a repair person to assist you in this repair.