Use a tool like Monitor Asset Manager (Windows) or edid-decode (Linux) while the TR8303C V4 is connected. You are looking for the "Established Timings" block. If you see "720x400" or "640x480" as the primary timing, your code is bad.

Aim the remote controller directly at the IR receiver module. Press the buttons firmly and without long pauses between presses: Press (or SOURCE ) once.

Connect the board to the panel's LVDS cable, plug in the backlight inverter, and power on the TV. (Even if the image is scrambled, lines are visible, or it says "No Signal", ensure the backlight is active).

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