if you have access to rgb output device and a vga to rgb cable, you can readily "experiment" by switching around the components. Further, your problem "statement" didn't really specify what happened to cause the problem... eg. just happened, happened after long storage, happened after dropping, happened after cleaning, etc.
Still further, most boards have labelling on them to indicate things like voltages and such. Check to ensure those voltages are indeed present on / at all boards.
As for whether the tv is worth it... depends on whether you got something better to do...
