There’s a decent chance that the 7.3 and 7.5 displays use two different driver chips, making their libraries incompatible.
Could you share a photo of how you’ve got everything hooked up, and the code you’re running? That might reveal something.
Normally I’d recommend searching for a generic (non-vendor-specific) library for the display driver used in the display, but Waveshare haven’t listed the part number on their datasheet, only communication data, so the library you’re looking for will be directly related to this 7.3" screen.
That means your options are likely the 2 below if you can’t find a driver on the internet:
Write your own driver
Return the screen and get one with a library for your host.
Let me know if you need any of the above clarified, hopefully we can get your project back on track!
If a product is a popular “Maker Favorite” we’re usually happy to process a “Change of Mind” return. Keep in mind that they will need to be in an unused and saleable condition (just as you’d like to receive them if you were expecting a brand-new product).
Shoot us an email from our contact page, or reply to your order email, and we’ll look into the return further for you if that’s the path you’d like to take.
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