Hi Keith,
It's a thought with new stuff damaged by carelessness, but a seven year old Plasma that's worth nothing (not even if it's an LG - Tony)
Damage can occur - say, broken screen when replacing CCFLs or Leds, or a slip of the probe while checking voltages. Have a well explained policy that if it dies on on bench it's just life, or perhaps not.
Folks these days mostly chuck cheap sets when faulty, and can be surprised with an inexpensive repair - Chris.