This board is notorious for silent firmware corruption.
: HDMI 1.4 (with CEC/ARC), VGA (PC-RGB), AV (CVBS), and USB 2.0. tsumv56ruu-z1 service manual
, they traced the path back to a tiny, bulging capacitor tucked behind the heat sink. It was the "bypass" the manual warned was critical for This board is notorious for silent firmware corruption
Since this is a "Universal Board" chip, the firmware must match the LVDS resolution of your specific LCD panel (e.g., 1366x768 vs. 1920x1080). Use the USB port to flash the and USB 2.0.
You rarely need a full schematic for this issue. You need a programmer (like a CH341A) and a valid firmware dump.