Question about Asrock P4I45GV R5 Motherboard

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Power problem( it not switig on )

Once power came very high and in SMPS spark came the system got off
what SMPS supports this and we want to know problem may crate to other components pls suggeust what do know and pls tele me the conections

Posted by csr0519259 on


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Tony Budz

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Depends, check to see if you have the power switch pin-outs from the case to the motherboard properly connected, they might be reversed.

Posted on Aug 12, 2008


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How the SMPS is working in telecom? What are the functions of SMPS? How it is Converting AC to DC? What are the parts are there inside the SMPS and their function?

smps involves ac to dc and dc-dc switching at high frequency because the type of a transformer in smps is a high frequency transformer and a current gain due to the ferrite do a dc to dc switching you need a mosfet,smps ic e.g uc3845,dc capacitor and some passive components.

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I am using dell power edge 1800 sever recently power supply (SMPS) shock circuited, i contact dell server tech support they toled me to replace smps but right now this server smps not available, it will...


The only other place that I know of is eBay. Dell is very slow getting a replacement to you and eBay has increase its standards to prevent fraud and misrepresentation. I would check there. If you see one you like, you can email the seller if you have any questions.

Good Luck

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My ilo lcd tv 32 inch only turns on sometimes. i need to keep pushing on button till eventually it comes on. same with the remote. it turns off easy

That is ths symptom of dying power supply due to bad DC filter caps, that will be the first palce to check, it will get worst and go dead completely.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.
Or, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Sep 05, 2011 | iLO 3200 32 in. LCD Television

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If the +B power is high and then drops off there is no feedback to regulate the SMPS power supply unit and so the unregulated supply. Check the opto coupler sensor at the SMPS which could have failed. Also the SMPS can have issues which can result in high +B. Checck the power to the processor which needs +5 volt. If absent check the regulator .
Check the link below for SMPS faults:

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Is there any troubleshooting a samsung httx72 device when it keeps shutting off?

It seems to be problem with power SMPS.So replace it with new one.It will solve your problem.Let me know the result. Waiting for your reply.

Thank you for using fixya support.

Jan 07, 2011 | Samsung HT-TX72 Theater System

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Checked all but not helpful. when i disconnect high voltage connectors from supply unit then power led goes stable but no display

This is typical as the SMPS power supply is shorted when the connector is on to the board. when you remove the connector, the short releases and the power resumes as the SMPS has a high current cut off for protection.
So the easy way out is to have a multimeter and check the power line to the circuit disconnected to check out the shorted driver. Once you have zeroed in to the component release and connect power supply to confirm. Now replace the shorted component.
make sure that any high voltage in circuits are discharged when you use the ohmmeter in the circuit.

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Maximum output of any smps is not based solely on the type of power switching transistors used. One of the parameters which will be crucial is the Ic (Max collector current rating). But this by itself isn't the lone determining factor either.

Other design factors which will come into play are the switching transformer, its size and windings. A smaller transformer and smaller wire gauge windings will generally mean lower max power output.

Max power output measurements probably require a set of load resistors, volt and amp meters, monitoring the 3.3, 5, 12 volt lines.

I'm not an engineer, but have had numerous computer power supplies apart, repairing some, junking some. Quality of construction or lack thereof is generally obvious. PC Power and Cooling probably builds high quality units. There are plenty of cheap, low cost power supplies which frequently die after a year or two, sometimes taking a motherboard down with it.

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