At random, and in random places, little black boxes appear on the screen. Sometimes there is only one; other times there are as many as ten. Changing channels doesn't help and neither does turning the TV off, waiting a few minutes, and then turning it back on. Sometimes it happens for several days in a row; other times we may go for a few weeks before we see them again.
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this means the TV having picture upper part of the screen. problem may be -15 V to vertical deflection ic suddenly gose off and system control gose to stand-by mode resolder vertical out ic , -15 v supply line from the fly back and system control .
There is a processing fault that is starting to occure. What you are seeing is a type of aliasing. This can be in the main signal processing or in one of the control areas.
The set will require service. The service rep will test the set by using board substitution. There are typicaly a number of areas in the TV set that can cause this type of fault. Once the defective board is located the fault will be easy to service with a simple board swap and some adjustments.
If the set is out of warranty, it may be expensive to service. With many of the no-name brands, spare parts can be difficult or impossible to have.
I would check and see if you have the text option on under your closed captioning. With the new digital transition the signal for text captioning has been getting messed up during broadcast here lately. If it is on i would just shut it off or go to regular closed captioning.
This is a problem with closed-captioning. What you are seeing is a closed captioning box with no captioning in it. Usually this is being accidentally transmitted by the cable company "head end". Just make sure your closed captioning function is completely turned off. if you are seeing it randomly, it may well be coming from your cable company. Is it just on certain channels?
The text mode in the closed caption is turned on.Turn off the closed caption.
I don't have the schematic in front of me, so, I will wing it.
There may be a button on the remote that says CC, if so then use that button to turn it off, if not then go to the service menu and you may have to search a bit.
Either way it's an easy fix and you can do it yourself.
If you can't find it, then, reply and I will give better instructions when I get into my shop next week.
Sounds like a digital cable issue to me. Try connecting the cable directly to the TV bypassing the cable box and I bet that the issue will be gone. If so then contact your cable provider as the box or the incomming signal may be at falt.