PCB assembly defects
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How do you troubleshoot a PCB board?
How do you troubleshoot a PCB board?There are some basics to point out:You need a good understanding of the basic electronic components (Resistors, capacitors, inductors, transformers, transistors, et...
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Causes of Warped PCB and PCB Assemblies
Causes of Warped PCB and PCB AssembliesWarpage in PCB and PCBAsHave you noticed that a particular board is no longer flat after assembly? Or maybe that a bare board that you received isn’t exactly flu...
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Solder Shorts on a PCB Board
Solder Shorts on a PCB BoardSolder shorts are generally on the increase in the wave soldering process. This is due to the ever decreasing component pitches used in manufacture. In the past, the pitch ...
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Poor Penetration on a PCB Board
Poor Penetration on a PCB BoardFor a solder joint to form on the topside of a PCB board, flux needs to be present in the plated through holes. The temperature of the topside of the PCB board needs to ...
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Outgassing on a PCB Board
Outgassing on a PCB BoardOutgassing is still a common problem associated with wave and hand soldering. Figure 1: Voids caused by outgassing.Basically when a pcb board is soldered any moisture in the b...
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Flux Residues on a PCB Board
Flux Residues on a PCB BoardFlux residues visible on the pcb board are more common due to the reduction in the use of cleaning in the industry. Over 75% of companies in Europe use no clean low residue...
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Sunken Joints
Sunken JointsFigure 1: Sunken solder joints caused by outgassing.Sunken joints on the base of the board are most commonly caused by outgassing from the printed board. Like small voics in the solder fi...
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Excess of solder
Excess of solderMostly for the beginner, it’s a huge problem that they use an excess of solder during PCB soldering.This may results in short circuits, wastage of solder, and cause bridging of solder ...
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Balling of solder
Balling of solderBalling of solder is also a huge problem for PCB soldering.In balling of solder when PCB boards come near to moisture surface then water vapors will start flow with the heat, and then...
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Heat loss analysis
Heat loss analysisMany electrical and electronic components or devices get heated much when they were working at full capacity.If we already cannot check it then they may cause overheating of the comp...
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Tombstoning
TombstoningTombstone components are basically surface mount components, like resistors, inductors, and capacitors, in which one side is lifted off from the pad.When the solder connects to both pads th...
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Pins and connector connections
Pins and connector connectionsPins and connectors connection is the most important part of PC boards which is basically operating the whole circuit. If the pins are not placed in the correct way may ...
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Insufficient wetting
Insufficient wettingSMD components would arise a problem if they are not having sufficient wetting.Then solder on the pins will fail to flow onto the pads as pin heated instead of pads, which would r...
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Skips solder
Skips solderUnsoldered surface mount joints are referred to as solder skips where the termination does not have any solder. It is caused by incorrect chip wave height or gassing of the flux on the und...
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Lift pads
Lift padsLifted pads are rarely seen on plated through hole boards but can occur on single-sided boards during assembly.When an excess of heat and solder were given to the surface of PCB boards, then ...
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Pins and blowholes
Pins and blowholesPins and blowholes can easily be detected as they appear a hole of solder on the PCB boards clearly.Figure 01-pins holeFigure 02-blow holesPin holes or blow holes are the same thing ...
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Chemical flow
Chemical flowThe leakage of chemical fluid is a big problem during soldering which can cause severe damage to the circuit.This problem arises in the production process of PCB boards, and trace element...
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Faulty wires breakage
Faulty wires breakageIn the process of analyzing the circuit, we will find the problem of wire breakage, which is also a major problem of circuit opening.If these broken wires come into contact with a...
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Insufficient heat - cold joint
Insufficient heat - cold jointInsufficient heat is also called a cold joint.During soldering when sufficient heat would not be given to the joints of PCB boards would result in poor conduction or may ...
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Lifted Resist
Lifted ResistFigure 1: The resist lifting here is due to incorrect specification of the PCB.Figure 1 shows a very obvious example of resist lifting from the surface of the PCB board after soldering. Q...
