What safety precautions should I follow when replacing the SMPS/HVPS board?

When replacing the SMPS board, you must wait 5 minutes after unplugging the power cord before replacing it, as you can receive an electric shock from electrical discharge. Only factory-trained service technicians should service this product, and only Samsung replacement parts should be used. Failure to use correct parts could result in damage, fire, or electric shock. (Pages 5, 7)