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Possible fault is A) blown LopT driver transistor, B) some of the rectifying Diodes in Power supply is short or open, thus not suplying needed voltage to circuitry. Also check all electrolytic capacitors in PSU circiuit & around Lop T. If any of them is geting hot or olstic cover is cracking or shrinking , or capacitor is bulginh\g on top.... Replace.
hello have you check the glass fuse inside the power supply if ok then it could be the lineoutput transistor .when you change the fuse make sure you use the same rated. the value will be on the end of the fuse good luck
Yup sounds like a classic SMPS fault OK, probably the "Chopper" transistor? but could also be the controller, the best way is to get a new PSU, but check to see if PSU is OK without a "Load" if it is then it is NOT your PSU,and the fault is elsewhere and is shutting it down. Usually it is something drawing a lot of current.. often in the Horizontal section, but not always.. GL
The first thing I would check is the line output transistor this is the large transistor mount on the heat sink next to the lineoutput transformer (the big black thing with the lead going to the side of the tube) just replace it if you have no meter to check it.
first of all you should check power cable of smps. if it is ok then you can check smps for ok or fault.Short green and black wire in main output connector(for motherboard).If fan dont moves then check primery rectifire(4 diodes),switching transistor and protestion transistor(on first heatsink),check fuse,ntc,capacitorin primary section. Hope this be of initial help/idea. Pls post back as requested, how things turned up or should you need additional information.
Good luck and kind regards.
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When this happens it is invariably the SMPSU, (Switched Mode Power Supply Unit), Generally the "Chopper" transistor has faulted. o you could either simply buy a complete PSU OR fix, replace, the faulty part. Then ya should be good to go.
follow the diagram, the base of the hor out should go to the secondary of the hor drive transformer, and going to the primary circuitry you should find a transistor, a small transistor, look for its collector and you should find a filter capacitor, may not be the same value but it is the filter capacitor.