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Message: <blockquote data-quote="techiesteve" data-source="post: 1928305" data-attributes="member: 98520"><p>All of the 12" Retina 2015, 2016 and 2017 MacBook models can with power applied just briefly display the battery trap symbol when their battery completely fails and then appear dead. Apple batteries were supplied with the battery bonded to the bottom case. The are not glued in place, but held by VHB tape, basically double sided tape on each side of low profile grey foam. Third party batteries vary in quality, but all I've seen had double sided tape affixed to their underside. An AASP and ARS could obtain a jig that supported the various sections of the MacBook when openedso that the flex cables weren't stressed, and cables can easily be stressed without the jig, especially the IPD cable. With a failed IPD cable the MacBook should still power on when power is applied but without the keyboard or trackpad operating. As you have to carefully lift up the front of the logic board to fit the battery contact PCB under it were you taking ESD precautions? Wrist strap and earthed anti static mat. Were the 2 larger and 3 smaller gold plated battery contacts clean? I have seen some TP batteries where the contacts needed cleaning with a fibreglass pencil. Most importantly did you not stress the I/O flex cable, and when you refitted its connector to the logic board, did you feel it click into place before replacing the 2 screws? Lastly, when you first opened the MacBook, did you press the battery disconnect button, and did the power LED on the logic board illuminate before or after the battery was replaced? If it now doesn't its likely the I/O cable assy (USB-C socket assy) or logic board could have failed if you have confirmed the I/O cable connector is properly located as mentioned earlier. Hope you find the problem and its viable to fix.</p></blockquote><p></p>

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