Stereo problems

Hi , the touchscreen stopped working on my original stereo, but was visible with sound .
I replaced the whole screen,
Now I just have sound but a completely black screen with no buttons working on the stereo, the steering wheel buttons work the volume and change chanel etc.
I purchased a new plug and play stereo for my van , but had no power whatsoever to it .
So I plugged the new stereo in my sons vw caddy and it works perfectly.
Is there a separate fuse for JUST the screen on my original stereo ?
Thanks
 
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