The schematic helps you trace the LCD ribbon cable connections and the backlight LED driver circuit. Instead of replacing the whole front panel, you can replace a single Zener diode.
: Check the TYT Official Website for official downloads. Tyt Th-9800 Service Manual Pdf
Sometimes, manufacturers provide service manuals or technical documentation for their products on their official websites. You might need to navigate through the support or downloads section. The schematic helps you trace the LCD ribbon