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It should be a signal issue
You can see if it is installed
Or buy an amplifier
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The signal problem is generally not good contact, if you have strong hands-on ability, you can reinstall the connector carefully.
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You can switch the positions of the two TVs.
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It is possible that the middle part of the TV is skewed and needs to be repaired.
However, you still have to pay attention to the distance when watching TV.
The Hisense TV I use myself is good,The picture is still clear。
It seems that there is no need, there is a feeling of repetition, the sound is a system, not that adding a certain piece of equipment can make a big difference, the main focus of the home theater is the sound field, it is very important to arrange it reasonably according to the requirements, the subwoofer has a lot to do with the sound source, find some imported DVD blockbusters to try, to add must also be an active speaker, the performance should be good10 inches good, or I don't think it's necessary. FYI.
Changhong named its large-screen TVs over 46 inches as "U-MAX".
It depends on how far the viewing distance is, too close will hurt the eyes, and the distance of 65 inches should be more than meters.