CJay Sorry if I got the wrong end of the stick. It looked like the OP was being encouraged to replace every cap on the TV.
I agree completely about making sure the PSU is working correctly.
Not sure what can be done if documentation is not available. Maybe trace the video signal to the big ASICs. Need to then check with scope what is coming out of the ASICs. Hopefully, there will be something that is the same freq as the line or frame/field and shows jitter.
What do you think CJay?
Well with some pieces of equipment the cost of capacitors and the need to remove them from circuit to test them means testing by substitution is more economical than the time taken to remove test and refit so it makes sense to replace them wholesale, they're essentially a 'wear part' at that price point, while it's not 'educational' it is a valid troubleshooting method.
Chances are also that if one has shuffled of it's mortal coil then the others are likely to be on their way too.
When the caps are something 'special' (high voltage, high cost, non-stabndard etc.) then of course it doesn't apply.
Consider the whole monitor assembly as the airframe and the capacitors as the bolts or rivets (or whatever 'must replace' parts are on an airframe) holding bits onto it to place it in the OP's frame of reference.
Tracing an LVDS signal isn't going to be easy, could be hundreds of megabits per second but it should be possible to trigger on some combination of the clock signal, frame or line sync and at least see the jitter.
Working out why is another matter entirely if the basics I outlined don't fix the problem.
I'd be reading LCD panel application notes if I were more interested in troubleshooting this sort of fault.