Identify and test MOSFET – Video
Imagine the flow direction
Drain to Source
Set the meter to DIODE mode. To test N-Channel FETs put NEG(-) probe on pin 6 or 7 and the POS(+) probe on pin 2 or 3. If the FET is good you should get some value between 100 to 500 or even higher, anything less than 100 the FET is shorted.
To test P-Channel FETs put NEG(-) probe on pin 2 or 3 and the POS(+) probe on pin 6 or 7. If the FET is good you should get some value between 100 to 500 or even higher, anything less than 100 the FET is shorted.
Odd number MOSFETs are usually P-Channel even numbered N-Channel.
FDS4435 would be a P-Channel and FDS4456 would be a N-Channel MOSFET
Make sure the CPU is removed or many n-channel fets will read shorted.
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