... lack of components, no tin dross, no short-circuit, no open circuit, no bad led indicator ,no high voltage, no low voltage, no output, etc 3 ... high temperature resistance, with power ,no bomb unit, no high voltage, no low voltage, no bad led indicator, etc 5. Finished ... unit with power, no high voltage, no low voltage, no bad led indicator, low ripple, with right cables , no bad ultrasonic bonding ...