never seen an VA6.8.. but they do exist... is the last model before VA7.
the sound circuit is the same as 6.0 and 6.5... so it's ok...
the video circuit is Sony CXA1145 or Fujitsu MB3514. if it's the sony you are ok, if it's the fujitsu it's worse...
but never seen an 6.8 HD... some 6.0 yes.... 6.8hd hein ?? Are you shure is a 6.8.. you have to see the markings on top of the chip...