The suffix "PB775" is the most variable segment, usually denoting the specific LCD panel model (e.g., a 32-inch HD or 43-inch UHD panel from a specific manufacturer like Innolux, BOE, or CSOT) and a firmware revision number (e.g., revision 7.75). Because different panels have different voltage requirements, resolution timings (e.g., 1366x768 vs. 1920x1080), and backlight types (Direct LED vs. Edge LED), the PB775 segment fine-tunes the video timings and power sequencing. Misidentifying this suffix is the most common cause of "no picture but sound" after a mainboard replacement.
On the screen, a new line of code appeared, overriding the OS: USER DETECTED. INITIATING UPLOAD. tpd.rt2841.pb775 firmware
seems to be a model number or a code for the device. The suffix "PB775" is the most variable segment,
Example output: [ 2.441] tpd.rt2841.pb775 loading firmware rev 3.2 Edge LED), the PB775 segment fine-tunes the video