Look for universal firmware packs on lcd tv led tv smart tv software , which frequently hosts VS.TP53U73.2 files.
Technical communities like LCDSoftware often archive these universal board files. Download TP53U73 1366x768 USB rar
the firmware file (usually named allupgrade_53.bin or similar) to the root directory. Plug the USB into the TV while it is powered off. Look for universal firmware packs on lcd tv
rely on remote "Service Codes" to adjust resolution or settings without flashing firmware. Download TP53U73 1366x768 USB rar