Howdy - good old Mum finally chose a Samsung UA32EH4000 to replace the Zinwell ZMT-620HD/Phillips CRT combo. Installed all good found all channels and left her with it.Later that night stopped working showing "weak signal check connection" . The current UHF antenna is not high gain and she in a pretty good area - Zinwell never missed a beat. Does the TV need more signal than the Zinwell did? I have quickly looked at antenna but is raining so cant get up on roof to check properly.
UPDATE - could be a lemon. I hooked up the Zinwell to the LED and all channels fine. Then put RF back in LED and re setup saved channels - all good (as it was on initial setup) so will wait and see how this goes.