SMPS power supply problem, help

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Currently, I am repairing SMPS(>1kW, 48VDC and 25A). I could not able to solve no power problem. I check almost every single components with a huntron tracker, of course, some certain component like mosfet driver IR2110, it would not able to check. Do you think it is the problem ? or something else. Pls help

Thanks

[miox_24]

try finding out if thers a shunt regulator "TL431" its a 3 pin IC, replace this, it worked for me:) try to check also the zeners feeding the power transistors, it also worked for me on my other dead smp, now both are working fine tnx

[kulkarni]

Dear sir,

I have a Intel PC - 945GZDMS-6H board. its have a power supply problem, some time when i am trying press the power button to start my PC, power LED flashing one time and quickly disconnected the supply.
when i tryed the same 5-6 times, then PC will be start by luck.

I cant understand, what the problem OR problem in SMPS of my Motherboard.

Pl suggest the solution about same.

Thanks.

[wozuiren]

My suggestion is to take out the SMPS from the computer, try to start it while loading it with a load of a 12V25W bulb (car headlight lamp) and see whether not it works. If the bulb is lighted up and the different dc output voltages are correct, then maybe you had a bad motherboard or a bad microprocessor.