I have a TEAC DV-2150 and am trying to play a Region one DVD thru to a Sony
Trinitron KV-PG21 TV and I don't know whether either or both items are
NTSC compatible and if they are how to get the DVD work as at the
moment I just get and 'invalid' message.  Thanks, Jo

Hi.

The problem is primarily with the TEAC and has less to do with NTSC
and more with the region of your player in relation to that of your
disc.

Your player model is not Region free.
The player is "NTSC playable" but this generally just means that if
you have a disc that is NTSC in the player's default region, then you
will be able to play it.

Obviously your player is not set to Region 1 by default. The hack is
to have the tray open, key 2168 on the remote and the screen should
display the Region code x (whatever it currently is). Then you push
the ENTER button on your remote till the Region changes to 9.

It should work cause it's working fine on mine.

After that, you'll be able to play discs from all regions.

Will your DVD player play other DVDs?

Which country are you in?