Screen replacement tested great, then black after completed install
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'''After removing the old broken screen''' from the Moto X4 XT1900-1, I connected the replacement screen (Glass and Digitizer) '''before proceeding''' to install the precut gasket. '''It worked perfectly'''. [br]
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Then, I turned if off, prepared the surfaces, applied the gasket, and reconnected the ribbon connectors. The fingerprint sensor created vibration, but the screen stayed black. I repeated the sequence a half dozen times: turn off (press/hold power button, then press/hold power and down volume buttons), disconnect screen ribbon, reconnect ribbon, restart, sound resumed and fingerprint sensor vibration. '''Infant failure''' of the replacement part, or '''other damage'''? [br]
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On close inspection, there was a '''loose tiny plastic cube''' near the latch that fell off to a slight touch. In its place, previously beneath the cube, were 4 tiny metal connections. I reviewed a YouTube video of the repair, and saw a difference ('''image attached'''), suggesting a possible cause. Apparently two of the cubes are missing on my phone; my guess is that these cubes may have been jumpers connecting the 4 connections somehow. I was unable to find the tiny cubes to inspect and see if they are jumpers. If they are, it might explain the failure to perform, and I could repair with solder if I knew more about their function. I am reticent to remove one of the remaining 3 for inspection, and these cubes may have nothing to do with my problem. If so, it is probably a known production issue. ''The preview of this posting did not preview the uploaded image, which is an illustration of the area by the socket and a graphic of the potential issue described in this paragraph.'' [br]
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The failure could be an “infant” failure of the component, which is not very unusual. Before returning the part, I am hoping that someone has an idea. Because IFIXIT is a Motorola partner, I’m hoping for guidance from IFIXIT and Motorola experience. Meanwhile, I’ll try the disconnect/reconnect cycle more times in the off-chance that it might clear some debris that might have gotten into the socket.