Paul Avery, start by A/V Reset all Inputs - Press front panel <INPUT> and <VOL (arrow Left)> buttons at the same time and hold for 10 seconds. This should work for your chassis as well "Built into many models is a “Test Picture” that can be accessed from the customer menu. Press <MENU> select “Picture+” then “Test Picture.” A photograph of the “Lady” will be displayed. If a TV picture performance problem exists, it should be evident. Otherwise, the test picture will have demonstrated that the set is capable of a quality display and the problem is likely due to a signal source or other external cause." If you can check to see what your error log listed for an error that occurred in the past.To access the Error Code Log: Press <MENU> <3-5-6-4>
I would not throw it out just yet:-)
Check the fuses (blue) for continuity and check the voltages (red) on the connectors. Let us know what you get.