iphone 6 6p 6s 7 7p A8 A9 A10 CPU chip testing jig, Testing good / bad A8 A9 A10 CPU by this Test Fixture, restore the iphone, show 53 error,  the CPU is good status, or it is the upper / lower error on the CPU. 

iPhone A8 A9 A10 CPU Test Fixture, it is All-in-One testing jig machine, 
 

Before Mobile Repair Engineer soldering A8 / A9 / A10 CPU to motherboard, this CPU Test Fixture will distinguish and test CPU BAD or GOOD ? save the time and money, if Engineer soldering the Bad CPU to motherboard, waste the time and money.

[Optional Type]:
Optional 1:  A8 CPU Test Fixture, 
Optional 2:  A9 Upper CPU Test Fixture