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How to repair the smps Bestec TFX0250D5WB

BESTEC SMPS for Repair Please tell me the procedure how to repair the SMPS

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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.

Posted on Apr 23, 2013


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SOURCE: not switching on

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SOURCE: Nothing happens when I press the power button. No

What about the power supply? I bet it's supply's issue. Otherwise make sure that PWR button wires are connected properly and to the correct terminals of the motherboard

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Hi this might not be a motherboard problem. Remove the memory card and clean the contacts and reinstall it. If this will not work for you replace the memory card with the same type you have in your computer. Hope this info will help you solve the problem

Posted on Aug 17, 2009

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SOURCE: Motherboard taken out by eMachines Bestec power supply

I have not identified the specific components on the motherboard that blow, but I can tell you the defect in the Bestec supply. The +5 VSB, which is the voltage that is on at all times, loses regulation and climbs to 8-11 volts. I believe this "higher than the required" +5V takes out the components on the motherboard involved with the computer/power supply "turn-on" circuitry. The "on" button on the eMachines front panel no longer turns the motherboard on because the "kept alive when the main power is off circuits" - which allow the on/off button to do its job of turning on the machine - no longer work.
Test your Bestec power supply by plugging it in the wall socket and have it not connected to anything. Read the voltage between the purple wire and any black wire. If you see +5.0V, then this wasn't your problem. If, like it did on mine, is closer to between 8, and 11 V, this is what took out the motherboard.

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SOURCE: Where do power switch connectors live on the motherboard

refer to ur mobo manual or download it

Posted on Feb 05, 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 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.

Nov 07, 2014 | Computers & Internet

1 Answer

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

Price of bestec tfx0250d5wb

Ask a question please. If all you want is a price comparison site try asking there. We can't give you a price that is relevant, unless we know where you live.(country, state, town.) But we would just use our fingers and ask a search engine. I can sell you one for 1000 USD (without postage) if you are desperate.

Jul 23, 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

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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