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I replaced a broken screen for a Moto G (1st generation), and now I'm struggling with 'ghost inputs/ghost touches'. In order to track down the problem, I came across a part which is located between the backside of the screen and the 'mainboard' of the phone (see image attached). What is this part required for?

Part

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It's a shield. It absorbs EM radiation by draining it to the electrical ground of the phone. They are used in order to meet emission specifications created by the FCC or similar authorities, or to prevent EM radiation from interfering with other parts of the device.

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  • \$\begingroup\$ So better leave it in? \$\endgroup\$
    – user236012
    Jun 1, 2016 at 7:35
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    \$\begingroup\$ You almost always want to leave it in place, yes. \$\endgroup\$
    – Ignacio Vazquez-Abrams
    Jun 1, 2016 at 7:36
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    \$\begingroup\$ And if slightly misplaced it can fail to make good contact, which may cause glitches \$\endgroup\$
    – Chris H
    Jun 1, 2016 at 9:47
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    \$\begingroup\$ It might also be affecting antenna radiation pattern as well and impedance as well. \$\endgroup\$
    – AndrejaKo
    Jun 1, 2016 at 15:40
  • \$\begingroup\$ That sounds exactly like something that would cause "ghost touches". \$\endgroup\$
    – user253751
    Jun 2, 2016 at 4:54

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