If software doesn't fix the issue, you can find the CV628H-B42 motherboard on specialty electronics sites like Kitbazar.
If your TV is stuck on the "Sony" logo or a "Flip" boot screen, a firmware re-flash is usually required. Installation Guide Download CV628H B42 1366x768 Sony Flip (Ulta) part2 rar
Place the extracted file (usually named ctvupdate.bin or similar) into the root directory of the USB drive. Flash Process: Unplug the TV. Insert the USB drive. Hold the Power button on the TV panel and plug it back in. If software doesn't fix the issue, you can
until the process is 100% complete. Resources & Sourcing If software doesn't fix the issue
Format a USB drive (8GB or smaller is recommended) to FAT32 .