Go here...
www.repairhelper.com
Look in the free assistance boards. If you don't find info of a similar fault then post details of yours and hopefully one of the tv techs will answer.
Edit: here's another one I've used too..
www.e-repair.co.uk/help.htm
.... and another one
www.anatekcorp.com/tvrepair.txt (see Chapter 11 on color problems)