I have an iPhone 6.  Screen is very dim, but everything else is working(getting texts, incoming calls, online, etc.).  Is this a logic board problem or LCD problem?

My iPhone 6 display is very dim.  I can still see it and everything else is working fine(texting, online, receiving and sending calls, etc.).  Sometimes it flickers, but it is just dim right now.  I’ve tried all the steps to...
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