Hold the on the TV panel (not the remote) and plug the power cord back in.
If the TV remains stuck after flashing, you may need to perform a "Wipe Data/Factory Reset" via the Android recovery menu. Download HV320 PB819 1366x768 Samsung 512M rar
Use WinRAR or 7-Zip to extract the downloaded .rar file. You should see a file named allupgrade_msd338_4G_sos.bin or similar. Hold the on the TV panel (not the