I suggest you don't open it yourself. First of all, you don't fix your mobile phone. If it's a quality problem, it needs to be replaced if it can't be repaired. If it's not a quality problem, you don't understand it at all and it's hard to fix it. Then go to the seller again, and they will have an excuse. Said it was artificially dismantled.

If you are worried about the seller's mischief, you can contact Taobao customer service, Taobao Xiaoer. Ask how to deal with it.

Guess the seller also joined the consumer protection, at least when Taobao freezes 500 yuan, the goods sold will be guaranteed. If he doesn't perform, Taobao will take money from 500 yuan and give the buyer some compensation.