![]() If there is a concern that capacitors may have retained charge they can be discharged by "shorting" or (preferably) by using a resistor with two probes.ĭon't try this at home if not competent and confident with such things. Main power supply caps are a good start to look at - but expensive to replace.Ĭapacitors can remain charged for hours in some cases. ![]() It may be.Įxamine the pcb, looking for unusual signs.Ĭapacitors with ruptured (broken) tops or split cans.Ĭratering in plastic bodies of power transistors. It is likely that the fault is not in the core itself but is caused by either oscillations being at a lower than usual frequency and/or the supply being overloaded by a fault.īe aware that outputs MAY be non mains isolated. The core is driven at excessive currents and/or with an unusual waveform and acts as an audio transducer as the core is magneticallly squeezed thn released by the alternating current. The most likely source of the noise is "magnetostriction" of the switched mode power supply transformer core. If you don't know what you are doing and what precautions to take then if you "play" with such devices you may not live long enough to learn. WARNING - PC Power supplies have lethal voltages internally both when mains voltage is applied and also for a variable period of time after being turned off.Ī power supply that has been turned off for many minutes MAY contain voltages that can kill you.
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