The indicator light will usually blink rapidly during the process. Do not turn off the power until the TV reboots itself. Maintenance Tips
Service menus allow adjustments for panel ID, LVDS mapping, and backlight levels. Common access codes for this and similar "PC821" series boards include: Input / Source + 208 Menu + 1147 Input / Source + 2580 Technical Specifications Main Chipset MediaTek MT5522 Resolution Support 4K (3840x2160) Panel Compatibility Frequently paired with HV430QUB-N1A Connectivity USB, HDMI, LAN, and Wi-Fi of this firmware? Tp.mt5522.pc821 Firmware
Then try:
After replacing the motherboard, the image might be upside down (Mirror Mode) or have garbled colors. Black Screen: No display despite the backlight being on. How to Download and Install Firmware The indicator light will usually blink rapidly during
: Unplug the power cord, wait 10 minutes for capacitors to discharge, and open the back cover. Common access codes for this and similar "PC821"
Some users with an RCA TV using this board reported that USB mode did not work for them. If the above fails, you may need an ISP programmer (like the TV160 or RT809H) to flash the EMMC directly.
Insert the USB drive into the (usually color-coded black) of the TV motherboard.