Why the video overlay is presenting fuzzy and not well formed chars?

Defective and fuzzy chars are the result of a faulty character updating. Max7456's internal memory is really picky about voltage level during a charset update.

Usually, it happens with some PCs with lower USB voltage. The only way to fix that is updating the charset by feeding the board properly. Just make sure it has around 5V there. E.g.: trying the two stages and feeding it by an external battery on the video IO pins.
i.e.: trying the two stages and feeding it by an external battery on the video IO pins.

 

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