Sony Wega LCD Projection tv,needs lamp

[jln1966]

A friend of mine has this Sony Wega LCD Projection tv model #ADF-50E2000. It was made Oct 2006. It works off and on. A message comes on the screen that says the projection lamp needs to be replaced. The picture will go out and a light blinks and then the sound goes off. It will come back on after a few minutes. Sometimes it will work right for several days. Is this set worth fixing? Would the lamp be the only part that needs replaced or would it have other problems?
Thanks,John.