They loaded it into a test rig. The folding machine began its metronomic rhythm: fold, unfold, fold, unfold.
M522-MAIN-FPC V1.1 a high-quality mainboard-to-LCD flex cable primarily used as a replacement part for smartphones
Technicians recommend "high quality" versions of this cable (often found at retailers like AliExpress ) because they are subjected to repeated stress during installation and daily device use.