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the low channel no sound indicates the tuner is failing. A black bar on top shows your electrolytic capacitors are failing and you are about to lose your vertical output transistor, then the voltage rectifier
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 .
Check to see that you don't have any channel locks or parental parental permission measures deployed. If so remove them, this includes V-Chip, and Parental lock out on the remote, and check your TVs menu items. What channel are being affected by this problem? Give channel number and channel type.
The black box is there because your closed captioning is on and set to text mode. Some channels send the signal even when there is no actual text to display. You can get rid of it by either turning off closed captioning or changing it to CC1 or CC2 mode instead of text. If you can't find those settings, then restore factory settings as directed in your user manual.
You have CC (closed captioning) turned on and it is set to text mode.....Go to the menu on the remote use the right arrow and hilight "C.CAPT",use the down arrow to highlight "C.CAPT",use the right arrow and highlight "off" then exit button on remote.
The close caption feature most be on and you need to disable it to get rid of the black box,the close caption must be set in any mode for the box to come up,maybe text1 or text2.Go thru the menu options until you get to the CC feature,some remotes have a key to bring it up and disable it.Let us know if you need more information.