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This usually means the panel is getting power but no data. Check your LVDS cable orientation.
If you bought your board on eBay or AliExpress, the seller often has a Google Drive link containing a library of .bin files for different resolutions. How to Flash the Firmware M.nt68676.3 Firmware
Before searching for a firmware file, you must identify your LCD panel's model number. This is found on a sticker on the (e.g., LTN156AT01 or B156HAN01.1 ). This usually means the panel is getting power but no data