LG 75SM9400PTA Service Manual page 23

(5) For remove Top Latch, with the back cover raised, remove B/C using Hera. (remove direction : outside → inside)
Top(Left)
Hera
(6) Two people grasp B/C, and remove B/C. (Grasp position : 600~800mm)
(7) B/C Handling is refer to B/C Handling Guide.
Hera
<Step1>
Top(Right)
Hera
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Hera
<Step2>