The external SPI Flash chip holding the firmware can fail, causing the "No Signal" or "Power Light Only" symptoms.
The is a specialized graphics processing integrated circuit (IC) manufactured by MStar Semiconductor , designed primarily as a total solution for LCD monitors and digital display systems. It functions as a highly integrated system-on-a-chip (SoC) that combines analog-to-digital conversion, scaling, and microcontroller functions to drive high-fidelity visual outputs. Core Architecture and Functionality Tsum1pfr-lf Datasheet