RE: Help with RX, ESC or Crystal??
Besides just trying a new ESC, maybe peek at the wires from the ESC to the receiver, and from the ESC to the battery, just make sure no solder joints came loose or anything. Otherwise.....it may be new ESC time [:@]
I guess you could try a new receiver crystal if you have one, plus that might be the cheaper first try to fix, it might make sense if it is acting like the TX is not on. But it sounds like the ESC.