Lenovo computer's national three-guarantee policy returns goods in seven days and exchanges goods in 15 days! What are the conditions? For example, a seven-day return must have quality problems before it can be returned?

Generally speaking, a 7-day return is an unreasonable return. As long as you bring the relevant vouchers when you bought the computer and other accessories of the computer are not missing, and the computer has no traces of being used, you can return the goods unconditionally, and there is no need for quality problems. If you have used it and found quality problems, you can return it within 7 days. After 7 days, you must abide by the 15-day exchange policy.