The quality of the PCBs that you install in your devices would determine the final quality of your products. How reliable your product is and how dependable your product is would depend very much on the quality of the PCBs that are housed in the electronic device you are manufacturing.
When you identify your PCB manufacturing company, you would not be able to know fully about the capabilities of your manufacturer beyond a certain limit. You would be forced to take chances beyond that limit. However, there are a few things that you could do to minimize the risks in sourcing your PCBs.
Are you selecting the most experienced PCB manufacturing and PCB assembly company? How long they have been in this field and do they enjoy good reputation? This is very important to check these factors. When you select a trusted manufacturer, you would get fully tested PCBs. This however does not mean that you could directly use the PCBs as delivered by your manufacturer.
All the PCBs delivered to you should be subjected to testing at your facility before they are installed in your devices or equipment. If you do not subject the PCBs to your own testing process, if there are any issues with the PCB then it could damage the other expensive components in your equipment. Even if your PCB manufacturer is willing to take the damaged or faulty PCBs in return, who will pay for the component damages in your devices? To avoid such risks, you need to have PCB testing as a regular protocol. Only after the PCBs are fully tested, they should be installed in your device and this will save you unnecessary issues including wastage of time and money.
If the PCBs do not pass your testing then you do not have to unnecessarily waste your resources in installing them in your devices. If your customers happen to get these devices with a faulty PCB then you would be responsible for replacing the entire product and your PCB manufacturer will not be ready to compensate for the losses or take PCBs in return in such instances. If only you were to subject your PCBs to testing before the installation process then you will have a detailed documentation to support your claims on faulty PCBs and your PCB manufacturer will have no other go but to replace the faulty PCBs. If the number of faulty PCBs were to be high in every batch then you could start looking for alternative suppliers.
For all these reasons discussed above, all the PCBs should be subjected to testing in your facility and it is one of the best practices that every electronic equipment manufacturer is to follow if they want to deliver highly dependable products to their customers. Your brand reputation would be damaged if you do not take these steps. Therefore, make certain that you do not skip this step at any cost.