Friends, have you ever worked hard and worked overtime to design the PCB, and finally got the order to make the board? Next, I waited anxiously and anxiously for the arrival of the PCB board, soldered it, verified it, and when it was powered on, the result was directly hung up...
Quickly check and find the problem. In the end, it was found that the hole was drilled, and the ground wire went with the power supply.
That happens even to experienced engineers. I start when the boards come in I just assemble it in sections and check each section to be sure it is working. The first is the power supply and make sure it does what it should. I have an electronic load so I load it to about 150% of what I expect the load to be and be sure it is operating properly. If I have a cap in backwards it will draw excessive current which my power supply will show. If I am lucky I let it run limiting the current so it can get warm. Most of the time this works. It let it cook for a while just to be sure nothing was missed. Then I add the bypass capacitors and do it again. Then the resistors etc and test it. If all is well then add the ICs. This is not a fast do it this way every time, each board is different and it may have to have some stimulus to make sections work.
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Yep, build the board in stages with it powered using a current limited bench supply.
You will know what the current used should be at each stage as you will have built the circuit up as a prototype on breadboard etc.
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