: If the mainboard remains unresponsive to USB commands, the physical eMMC or SPI flash memory chip may be corrupted. You must use an RT809H or similar hardware programmer to re-flash the chip, or solder a pre-programmed replacement chip onto the board. Pro-Tips for Advanced Diagnostics
Before removing a single screw, perform this diagnostic checklist to gather critical clues. This approach is the cornerstone of efficient repair and saves you from unnecessary disassembly. v7 0 smart oled led lcd tv repair tips pdf free exclusive
(This text is prepared for educational and informational purposes for electronics technicians.) : If the mainboard remains unresponsive to USB