Einleitung
This guide will take you through the steps of replacing the heatsink in your 2018/2019 (A1989)MacBook Pro.
Werkzeuge
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            Power on your Mac and launch Terminal. 
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            Copy and paste the following command (or type it exactly) into Terminal: 
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            'sudo nvram AutoBoot=%00 
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            Press [return]. If prompted, enter your administrator password and press [return] again. Note: Your return key may also be labeled ⏎ or "enter." 
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            sudo nvram AutoBoot=%03 
 
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            Use a P5 Pentalobe driver to remove the six screws securing the lower case: 
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            Two 6.2 mm screws 
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            Four 3.4 mm screws 
 
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            Apply a suction handle to the lower case near the front-center area of the MacBook Pro. 
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            Lift the suction handle to create a slight gap between the lower case and the chassis. 
 
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            Insert one corner of an opening pick into the space between the lower case and the chassis. 
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            Slide the opening pick around the nearest corner and halfway up the side of the case. 
 
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            Repeat the previous step on the opposite side, sliding your opening pick under the lower case and up the side to pop the second clip free. 
 
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            Insert your opening pick once again under the front edge of the lower case, near one of the two centermost screw holes. 
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            Give the pick a firm twist to pop free the third clip securing the lower case to the chassis. 
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            Repeat this procedure near the other of the two centermost screw holes, popping the fourth clip free. 
 
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            Pull the lower case firmly towards the front of the MacBook (away from the hinge area) to separate the last of the clips securing the lower case. 
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            Pull first at one corner, then the other. 
 
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            Carefully peel up the large piece of tape covering the battery connector, on the edge of the logic board nearest the battery. 
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            Remove the tape. 
 
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            Gently peel back the small piece of tape covering the battery board data cable connector. 
 
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            Disconnect the battery board data cable by sliding it out from its socket. 
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            Slide parallel to the logic board, in the direction of the cable. 
 
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            Use a T5 Torx driver to remove the 3.7 mm pancake screw securing the battery power connector. 
 
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            Use a spudger to gently lift the battery power connector, disconnecting the battery. 
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            Lift the connector high enough so that it stays separated from its socket. If it accidentally makes contact during the course of your repair, it could damage your MacBook Pro. 
 
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            Use a T3 Torx driver to remove the two 1.8 mm screws securing the trackpad cable connector bracket. 
 
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            Use a spudger to disconnect the trackpad ribbon cable by gently prying its connector straight up from the logic board. 
 
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            Carefully peel back the black tape to reveal the ZIF connector. 
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            Unlatch the ZIF connector by flicking the arm on the connector upwards and carefully remove the cable from the connector by sliding it out. 
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            Repeat this process with the newly revealed connector. 
 
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            Use a T3 Torx driver to remove the two screws. 
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            Once the screw have been removed carefully remove the metal shield. 
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            Under the metal shield there is a connector, carefully unplug it. 
 
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            Use a T4 Torx driver to remove the two screws. 
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            Two T4 Torx screws. 
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            Carefully remove the metal shield. 
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            The second cable you will disconnect will be lightly adhered so carefully slide a plastic spudger under it and finally unplug it. 
 
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            Use a T3 Torx driver to remove the four screws. 
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            4 T3 Torx screws. 
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            Once the screws are removed carefully remove the metal shields. 
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            Carefully unclip the connector. 
 
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            Use a T3 Torx driver to remove the two screws. 
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            Remove the metal shield carefully. 
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            Carefully unplug the connector. 
 
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            Carefully peel back the black tape to reveal the ZIF connector. 
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            Unlatch the ZIF connector by flicking the arm on the connector upwards and carefully remove the cable from the connector by sliding it out. 
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            Repeat this process with the newly revealed connector. 
 
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            Carefully peel back the black tape to reveal the ZIF connector. 
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            Unlatch the ZIF connector by flicking the arm on the connector upwards and carefully remove the cable from the connector by sliding it out. 
 
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            Use a T3 Torx driver to remove the two screws. 
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            Once the screw have been removed carefully remove the metal shield. 
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            Under the metal shield there is a connector, carefully unplug it. 
 
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            Use a T4 Torx driver to remove the screw. 
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            T4 Torx screw. 
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            Remove the metal shield carefully. 
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            Carefully unplug the connector. 
 
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            gently disconnect the audio socket flex cable with a spudger. 
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            gently disconnect the Touch ID flex cable with a spudger. 
 
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            Use a T3 Torx driver to remove the two 2.4mm screws securing the display cable bracket. 
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            Use a T3 Torx driver to remove the two 1.2mm screws securing the display cable bracket. 
 
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            Use a T5 Torx driver to remove the six 2.2mm screws securing the logic board. 
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            Use a T3 Torx driver to remove the three 1.9mm screws securing the logic board. 
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            Use a T5 Torx driver to remove the two 2.3mm (3.7mm head) screws securing the heatsink. 
 
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            Congratulations you have now replaced you MacBook's LogicBoard, if you have any questions please ask! 
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            Thanks:-) 
 
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To reassemble your device, follow these instructions in reverse order.