If you bought the board or monitor on AliExpress:
Smart TVs are essentially computers. Sometimes, a power surge or a failed update can corrupt the system memory. If your TV is stuck on the logo screen, keeps restarting (boot loop), or is completely dead (no backlight/image), the internal software is likely corrupted. A software re-flash is required to "unbrick" the device. tp.sk518d.pb802 software download
Chinese hardware vendors do not have traditional support portals. They share files via public cloud storage. If you bought the board or monitor on