To download the firmware for the mainboard specifically matched for the LC390TU1A panel, you can use specialized technician repositories like Receiver Pro or Software Zone .
Plug the TV back into the AC outlet while still holding the button. Download VST59S PB801 LC390TU1A rar
The is a universal "three-in-one" motherboard commonly used in 32" to 40" LED/LCD TVs. Mainboard Model: TP.VST59S.PB801 To download the firmware for the mainboard specifically
Use a USB 2.0 drive (8GB or 16GB) formatted to FAT32 . unplug the TV
Once the LED stops blinking and remains steady, unplug the TV, remove the USB, and power it back on. ⚠️ Troubleshooting tp.vst59s.pb801 zif z48n-d4 tv main board service info