Have TV Questions? Ask a TV Technician
If the problem is intermittent then the TV will need to be tested at a factory using their full range of diagnostic equipment, as it is not possible to easily determine the cause of the fault on-site.
Pioneer are fully insured to cover any mishaps caused whilst the TV is in their care.
The TV needs to be taken to a factory or repair center because the large diagnostic equipment used cannot be transported to your home.
You could ask the repairman what insurance cover he has, and he will be happy to assure you.