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Hi I have a sony xperia z3 plus. I broke my front and rear glass and i replaced the lcd (the lcd came attached to a new xperia frame) After i followed all of the instructions step by a step i ended up with a working touch and screen but the screen has no brightness or led light. Any ideas what could be the problem?

What do you mean by working touch and screen? So there is no backlight but you have visible display? If that is the case probably the backlight connector is not connected

Hey orvawalla, Check the LCD cable connected to the logic board, that will be the problem! Still nothing happening? Contact the company where you bought it.