It sounds like that the TV was set to skip certain channels. You need to rescan for channels or manually edit the channel list. To manually add channels, press Menu on the TV (or the equivalent key on the Sony remote if you found a code that works). Then use the Up/Down arrows (channel change keys) to select Ch Scan Memory + . Then enter the number of the channel (numerically or up and down arrows). Press + (volume + key) to change the setting from Deleted to Added or vice versa. Since you do not have the original remote, I'm not sure if the Sony remote will match the Reset key of the original remote. Unfortunately without that key being pressed twice, you can't reset the entire channel list and cause the channel search to begin automatically.
The manual for the DS19330 TV is here: http://www.sanyotv.com/DS19330%20%28ESF%29%203764--.pdf
. (I'm assuming you haven't recently added cable after only receiving only OTA signals. If you have changed inputs like that, you need to go through the menu and change the source.) Menu > Cable or Air .
I hope this helps.