alm,
To answer your question regarding the UTD1025C....
I have been 'playing' with it since it arrived yesterday to make sure the Channel A issue is the only fault....it is

I now have to build up the courage to start dismantling it.... I am thinking things will be pretty tight inside that case ! I will do a very careful and staged disassembly with plenty of pictures that may be posted on this Blog. Once its apart, the investigation into the cause of its Channel A failure will begin

I'm kind of looking forward to it, yet at the same time dreading what I may find....my eyes aren't what they used to be

but I do have all manner of optical and electronic vision enhancers available

I have started another thread on the UTD1025C, progress will appear there.