Display flickering

I have a June 2019 release, 13” inch Macbook Pro with model number A2159 (EMC 3301).

My screen is flickering – that is, it blinks black every few milliseconds. There are no lines yet, but sometimes bands that appear. I have called Apple Care and run some of the diagnostics they asked me to, including resetting the SMC. I have also updated my OS to the latest version. I have been advised that this is a hardware issue and will require screen replacement, which is an expensive affair.

I felt at first that the issue is one of hardware because the flickering stops when the screen is used at a low angle or when it is mirrored onto my iPad. So, I borrowed an external screen to use for a few days. There is no flickering on this external screen.

When I connect my external screen to the laptop, the flickering greatly reduces to almost none even at a 90* angle. Even when the external screen is not in use and powered off, the flickering is reduced. As long as the HDMI-DVI wires are connected to laptop and screen there is no flicker. This is not the case when I connect just the charger or USB to the laptop. Please see this video: https://youtu.be/AAd8wZtbKMY

Someone suggested that this might be an issue of screen resolution – this might be the case as I see the resolution change as soon as the screen is connected/disconnected (even when powered off) (the laptop screen goes black for a couple of seconds to adjust). I tried to adjust the resolution from the “Displays” settings to resolve the issue but was not successful.

I am looking for a good diagnosis of what the issue might be and any advice on next moves. I would like to understand what the problem may be exactly.