If you want to see whether the Apple phone you bought is second-hand or not, you need to see if it's gone, or if you want to see the quality of the second-hand phone you bought directly. If you want to see the quality, you need to see the following test method.
We all know what's the most expensive thing about Apple phones. Yes motherboard. Half of the second-hand price goes up. If a friend has bought a second mobile phone in a physical store, he may have met this kind of mobile phone and pasted a sign at the back.
The line is called anti disassembly mark. It is used by sellers to prevent black hearted buyers from replacing the inner parts motherboard, and then returning them maliciously. So this label will be pasted in the industry and after-sales service will be conducted within seven days. Recognition of the mark does not recognize the person.
What about the buyer. The buyer has to check the goods. The best way is to turn on the main board to see if it has been repaired or replaced. But we can't dismantle the machine, so we have the skill of burning the machine.
As shown in the figure. Turn on the recording function. Turn on the flashing light and record for 30-50 minutes. If there is a recording in the middle of the process, it will shut down automatically or restart automatically. So hurry to return the goods the next day. The motherboard is mostly problematic. Either repaired or replaced or the problem motherboard. The flash provides heat and the recording function is to keep running. A good second mobile phone can easily carry the test. The garbage motherboard will be forced to shut down, as the saying goes, the CPU will not work as a whole.