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Hello, my bestec 250w smps is not working.can any one help me repair the faulty one .I am a qualified engineer.

Smps power supply for bell based desktop

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It is unlikely you can repair your power supply for less than a new one unless the problem is simply an internal fuse. Check Amazon, or eBay for possible replacements: eg.

Posted on Nov 08, 2014


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Posted on Jan 02, 2017

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SOURCE: PC smps power supply problem

ok you open the pcb check the fuse first then replace it if faulty if it burns again then check 4 diodes then see if 200v big capacitor is expanded or not if so then replace it if not then check diodes after transformer if short then replace it

Posted on Nov 21, 2008

  • 17 Answers

SOURCE: Regarding 250W SMPS

250 watt is low under any circumstances, I'd upgrade atleast to a 450 or higher, around 650watt to be extra safe.

Posted on Jul 11, 2010

  • 40 Answers

SOURCE: power supply is not working this smps sulotion (

you must look at the diode or the resistor if the its working....

note: pls open first the Power supply and test it with the tester: then jumper it with the color green and black

Posted on Oct 13, 2010

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Hello, my bestec 250w smps is not working.can any one help me repair the faulty one .I am a qualified engineer.

It is likely cheaper/easier to replace the power supply. Look for a replacement through Amazon or eBay. For example:

Nov 07, 2014 | Computers & Internet

1 Answer

How to repair the smps Bestec TFX0250D5WB

1) PROPERLY discharge the Electroytic Capacitors inside, BEFORE working on the unit.

The Electrolytic Capacitors used are Radial Aluminum Electrolytic Capacitors.
The large ones you see, are used in the Input Stage. They filter the incoming AC electricity.
These capacitors can hold a charge of Up To 100 Volts.
That is enough power to stop your heart. In other words -> FATAL

This of course does NOT make me want to post info, about possible repair on your Power Supply.
Above ALL, I do NOT want You to come to ANY harm!!

However I know that some situations require trying to fix a unit. It isn't always possible to go out, and but a new unit.
I just want YOU to be SAFE!
The Bestec units are of low quality.
1) Low quality Electrolytic Capacitors
2) Low quality Rectifier Bridge
3) Low quality Power MOSFET's
4) Lighter gauge of wiring, then what should be used
The Electrolytic Capacitors are the weakest link. Start with a visual inspection, and see if any are bad.

Using the direct link option does not seem to be available for me. Therefore you have to copy each link I will state, and paste it in your address bar. (http://) Then press the Enter key.

If you are unaware of how to do this, please post back in a Comment.

The same information for Electrolytic Capacitors on a desktop computer motherboard, can be applied to the Electrolytic Capacitors in your Bestec power supply;





For additional questions please post in a Comment.

Apr 21, 2013 | Computers & Internet

1 Answer

My smps is working, but my power is not coming to the mother board

Replace the power supply or have it tested.
Amazon com bestec atx 300 12z You can get a replacement pretty cheap. Most all power supplies can also be tested - Bestbuys geek squad or a small computer repair shop should have the means to test it.

Feb 23, 2013 | HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP...

2 Answers

My computer shuts down

problem with you either capacitors on motherboard or capasitors in smps, 80 % it becouse of capacitors in smps, it's not providing sufficient power to motherboard.

Feb 26, 2011 | E-Machines eMachines Desktop PC

1 Answer

Regarding 250W SMPS

250 watt is low under any circumstances, I'd upgrade atleast to a 450 or higher, around 650watt to be extra safe.

Jul 06, 2010 | Gateway Emachine Bestec ATX-250-12E PS...

1 Answer

How to use ATX-250-12z SMPS with 24 pin

Chances are that 250w power supply is not going to power a motherboard with a 24 pin connector, but you can try.
You will need to purchase a 20 to 24 pin adapter cable.
Google Search Terms: 20 to 24 pin adapter

Oct 27, 2009 | Gateway Emachine Bestec ATX-250-12E PS...

1 Answer

Do not start

First remove smps power suply unit box from cpu.
Then ground pin and check is it on you have to ground 4-5 pin blck and green.
Then if it is on then smps is ok.then pull cmos cell from motherbord for 10 minutes make sure cmos cell give voltage.Remove pci cards from pci slot is any.
connect ATX power supply to motherbord then check.
But if smps is not turn on then it has some issue.
Change fuse of smps if still not on then you have repair it or change.
Let me know if you need further assistance.

Oct 26, 2009 | Gateway Emachine Bestec ATX-250-12E PS...

1 Answer


check on mother bord there is power on key in corner of motherbord.
Some smps has switch in back side of it.

Mar 26, 2009 | E-Machines Bestec ATX-300-12E Rev. D 300w...

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