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.