Test the resistance points.
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Multimeters can be valuable troubleshooting tools when working with circuit boards.
Even if you don t have an electrical schematic of the circuit board which would identify components and give you the voltage and resistor values that should be present many circuit boards have test points that are clearly labeled.
They attenuate the voltage so that it is proportionate to the current.
Disconnect the power supply from the circuit board.
A test of circuit board components such as capacitors resistors transistors and integrated circuits can be done to some extent without removing the components from the circuit board.
Resistors manage the flow of current through the circuit board.
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Follow the signal path on the board so that you can locate the first resistor in the chain.
In circuit test ict is an example of white box testing where an electrical probe tests a populated printed circuit board pcb checking for shorts opens resistance capacitance and other basic quantities which will show whether the assembly was correctly fabricated.