He reached for his soldering iron. There were thirty more of these boards coming from a bankrupt hotel next week. And now, he had the map.

The rain had turned the streets of Shenzhen’s Huaqiangbei electronics district into a mirror of neon. Leo Chen hunched over his workbench, the acrid smell of burnt flux still clinging to his fingers. In front of him lay a corpse: a 65-inch 4K display panel, model .

Leo traced the dark green PCB with his multimeter probe. 94V-0 meant the flame-retardant substrate was safe, but the circuit itself was a fire hazard. HannStar was a Taiwanese giant, but this J MV 4 revision was an enigma—a custom run for a luxury hotel chain that had since gone bankrupt.