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Sorry you are having trouble here, firstly are the blinks red?if so please re-count as I think it may be 9 blinks?
Was this the same code with the ORIGINAL mainboard?
Their is nothing in the service data for 10 blinks however it still is a code however they have not included it that leaves us with a problem I am afraid, it now becomes a guessing game because you have replaced the main (I would have done that) that just leaves the next most suspicious board the power which ordinarily will give 1 blink if it had a problem, I am only approaching this the way I would if its on the bench we would now order a power board that hopefully the suppliers would let us return?not sure if you want to do that, the set also has a inverter and it could also be that or hopefully not the panel itself, sorry this is nothing easy, if you wish I can opt out maybe another tech has got a better idea?
A faulty power supply board can cause unexpected symptoms, so it could be the cause of the 10 flashes you are seeing.
Try replacing it and let me know if successful.
Then we can take it from there.
Let me know how it goes.