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hi my ipad air 2 touch panel not working i already change lcd+touch panel but its not working i think its a mother board problem anyone give me tha solution for tha board level deatils

Ideally you need to be working with known-good replacement parts so that you can rule things out. If you know that that the replacement screen is in working condition, then I would check the condition of the connectors and the components in the surrounding area. Look for any dislodged or partially dislodged components. Then depending on the issue (you don’t say what the exact problem is) you’ll want to check the LCD or Backlight subsystem (PMU/U8100) or the Touch circuit (Stinger/Cumulus).