PoE Supply Fault

Thread Starter

Muhammad Farhan Rafique

Joined Apr 15, 2016
i have one good module. i exchanged all parts from good module to bad module including I,C, FETs, Bridg Diodes, Chopper etc. (except micro resistors and ceramic capacitors). good module still working and bad module isn't.

when i connect good module steady power is provided from switch and when i connect bad module there is only pulses and spikes of high voltage.
what i read about this module is:
PoE switch first identify that whether the connected device need power on switch port or not by checking class 0 signature.
i don't know which component provide class 0 signature to switch.
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