Achilles’ heel On PCB Circuit Production

But sometimes problem still exist,  for example a missing resistor or a solder bridge , PCB circuit damage, Fake components.

What are the common problems that cause a PCB (printed circuit board) to fail?

• Fake components, one component will lead to all boards failed, need to pay additional repair cost.
• Low precision SMT machines and DIP workshop, most BGA parts can not be inspected by X-Ray testing. and other soldering problems.

• Human error is the vital of all printed circuit board manufacturing problems. From misreading a schematic to mislabeling a component, there is a laundry list of problems that can present themselves during the design and manufacturing stages.

Update:

A particular QFN chip seems to be failing, see an example below. It seems some rework was attempted, which suggests an solder bridge was noticed during a visual inspection. (resistors are 0603 for size reference)