Brightness not increasing after LCD replacement

Hi Guys,

I'm new here.
My problem is, I have replaced my Sony Xperia Z phone Lcd display last week with a new one bought online.
After replacing the display the phone brightness is very low. When I tried to increase the brightness throgh the settings it is not increasing. The phone remains in low brightness either the level at 0% or at 100%. What will be the problem? I tried hard reset and factory reset, but that not brings any changes. what might be the problem. Is it due to the new display? Is it because any inner hardware failure causes during the lcd replacement?

Please help me. I want to know about this before going to the service centre.

Thanks
Renjith

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