Technical Library | 2019-06-07 14:49:54.0
ACI Technologies was contacted in regards to poor solder joint reliability. The customer submitted an assembly that was exhibiting intermittent opens at multiple locations on a ball grid array (BGA) component. The assembly’s functionality did not survive international shipping, essentially shock and vibration failures, immediately making the quality of the solder joints suspect. The customer was asked about the contract manufacturer and the reflow oven profile as well as the solder paste and surface finish used. The ACI engineering staff evaluated the contract manufacturer’s technique and determined that they were competent in the methods they used for placing thermocouples in the proper locations and developing the reflow oven profile. The surface finish was unusual, but not unheard of, in that it was hard gold over hard nickel, rather than electroless nickel immersion gold (ENIG). The customer was able to supply boundary scan testing data which showed a diagonal row of troublesome BGA pins.
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
NG OK pcb magazine unloader|PCB NG OK unloader or double track magazine PCB unloader after AOI machine, receive the signal given by AOI https://www.ascen.ltd/Products/Automatic_SMT_equipment/PCB_loader/131.html ASCEN major for the PCB conveyor and t
