(A) Check the main AC source of the supply line.
(B) Check continuity of earth, neutral & line with respective point of the plug & check the AC power of the power cord.
(C) First switching on the PC, check that the fan of SMPS Is moving or not.
(D) If the fan is moves, that means AC is rectified through the transistor ckt. of SMPS.
(E) If fan does not move that means there might be the problem in transistor ckt. or the fan-power connection loosely connected.
(F) After this the power dose not comes to the PC, the first suspected problem exist in the diode rectifiers ckt.
(G) Check the +5 or -5 volt and +12 or -12 volt DC powers of the connectors.
(H) If all above condition of checking give the result ok, in that case check the soldering connection of 12 pin power connection of Mbd (Motherboard) back side. Even check the continuity of each 12 pin connection.
(I) If the all above condition are ok then obviously the Mbd DC power conducting line trips the DC power from SMPS.
(J) In this case, near the Mbd power connection there might be the combination of resistor & capacitors, which can be cut out.
(I) If the all above condition are ok then obviously the Mbd DC power conducting line trips the DC power from SMPS.
(J) In this case, near the Mbd power connection there might be the combination of resistor & capacitors, which can be cut out.
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