Only a small strip at the top of the screen is functioning, everything else is black.

jefferson49 wrote:

My screen was working perfectly until problems with the backlight cable started, to the point that my screen went completely black. After that, I took it to a repair shop to have the cable replaced. After the replacement, the backlight works, but I can only see a small portion of the screen right at the top where the Apple logo and the menu with the Wi-Fi icon, etc., are located. The rest of the screen remains black.

MacBook pro 2017 A1707

Hardly sounds like they fixed it. I would march it back in there,

did you boot up and test it before you left the shop? I would recommend it.

For hardware issues take it in—

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"

Genius Bar Reservation and Apple Support Options - Apple

Outside the USA

Contact Apple for support and service - Apple Support

Plug in an external monitor and compare your results.