- Mon Jan 18, 2021 8:59 pm
#47703
^^ This. The probability that the PCB is bad is very low. The probability that components are bad is fairly low. The probability that soldering is bad is 100%, by appearance of many poor solder joints in the images.
So, I would agree to re-flow all of the solder connections. I have done this countless times on my own and other's work, and the simplest system I found is to brush good electronic rosin flux on every soldered joint. All of them. Both front and back. It will be very messy, so use gloves. Then get comfortable (with magnification lenses/microscope, etc) and methodically re-flow every solder point, one-by-one from one side, until they are all fully re-flowed to proper appearance on both sides. Examples are available online. Most will not need more solder, and some may need solder removed. Your soldering tip must be kept clean and lightly tinned for this to work, the first time and any rework.
At that point you can wash the board with solvent, or toss it in your dishwasher for a cleaning, if you live alone. When dry, re-inspect and begin new testing. If there are errors, test each solder joint in the error circuit for function with a meter, and the component if possible, reworking as-necessary. For me, this has reliably been the quickest, easiest and cheapest path to success. Good luck!
David
So, I would agree to re-flow all of the solder connections. I have done this countless times on my own and other's work, and the simplest system I found is to brush good electronic rosin flux on every soldered joint. All of them. Both front and back. It will be very messy, so use gloves. Then get comfortable (with magnification lenses/microscope, etc) and methodically re-flow every solder point, one-by-one from one side, until they are all fully re-flowed to proper appearance on both sides. Examples are available online. Most will not need more solder, and some may need solder removed. Your soldering tip must be kept clean and lightly tinned for this to work, the first time and any rework.
At that point you can wash the board with solvent, or toss it in your dishwasher for a cleaning, if you live alone. When dry, re-inspect and begin new testing. If there are errors, test each solder joint in the error circuit for function with a meter, and the component if possible, reworking as-necessary. For me, this has reliably been the quickest, easiest and cheapest path to success. Good luck!
David
-= If it was easy, everyone would do it =-