Anyone come across common problems with this or a replacement source
please? It is an Optimus CLV-A900T and also seems to be known as a
Recoton with a similar number. It says on it CUSTOM MANUFACTURED IN
CHINA FOR RADIOSHACK/TANDY CORP but they deny all knowledge. There is
also a cat number on it which is 40-1372.

The one i have has just completely died: No light or symptoms when
plugged in. I checked on line and others seem to have had this
problem, though they cured it by buying a replacement.

There is one baffling point which is that there is what is known as a
'charge' socket on the back (as opposed to an AC adapter socket) along
with a charge light on the back. Unless someone knows better, I
checked inside and there doesn't seem to be any battery inside to
charge and potentially short the circuit when it goes bad.