iPhone 7 LCD brightness

Hi Guys,

Wonder if anyone has experienced this issue.

I have noticed a few times after replacing an iPhone 7 screen with an OEM screen, the maximum brightness can vary. This can sometimes even happen when installing the original Apple screen again.

For example: if you turn the brightness up, most of the time it will keep getting brighter until it gets to the maximum level, but sometimes when the brightness is only at 80% level then it won't get any brighter after this point, then while you're using the phone the screen could suddenly become brighter because the brightness is at maximum level.

Hard to explain but hopefully you guys have either experienced this yourself or i am explained it good enough for you to understand.

Thanks in advance.