Question about Bestec ATX-1956F (ATX1956F) 200-Watt Power Supply

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ATX-1956Fpower supply problem

With out mother board connection ,all the voltage are ok,fan rotate,with mother board connection power supply is dead.

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Clean the RAM and try again. Use an eraser on the 'teeth' of the RAM. Disconnect all drives and roms and try start with only the MB to get a display. Try get the alarm system working by fixing a MB speaker. This is very helpful and saves time in diagnosing MB problems.

Posted on Oct 29, 2012

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Check another power supply to connect in mother board and then confirm mother board problem that means mother board power ic problem.

Posted on Feb 12, 2009

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Sounds like the MotherBoard is dead?

Posted on Feb 12, 2009

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The computer has on occasion crashed for no apprent reason. I had the power supply out and it has normal light indications until it i plugged into the mother board. I have had itwork normally, for a...


Bad Power Supply. Weak voltage power rail.

Bestec is a low quality power supply. Used to save the computer manufacturer money.

Also, a Power Supply with a weak voltage power rail will put out enough power to light LED lights, and perhaps spin fans, but not enough power to turn the Processor on, and/or keep it on.

A) ALL the LED lights use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts

C) A typical Processor uses 51 to 125 Watts. Depends on what Processor it is.

Replace the Power Supply. Clean the inside of the computer out, with a can of compressed air for computers before installing.

What is the computer manufacturer name, and Model Number. The Model Number is on the back of a desktop computer tower next to the Windows product key, or up on the side of the computer tower.
Post back in a Comment.

Regards,
joecoolvette

Dec 04, 2010 | Bestec ATX-1956F (ATX1956F) 200-Watt Power...

1 Answer

Can not get computer to power back up no lights on front o rear just little light on mother board have dell 8400


Bad Power Supply, sscorbett.

Usually you have enough power to light LED lights, (Like the harddrive activity LED light for add-in cards, that you see on the motherboard), and spin fans, but Not enough power to turn the Processor on.

Dell Support >Dimension 8400 > Service Manual

http://support.dell.com/support/edocs/systems/dim8400/SM/index.htm

Technical Overview > System Board Components

http://support.dell.com/support/edocs/systems/dim8400/SM/techov.htm#wp1052739

harddrive activity light for add-in cards (SCSI LED)

The Dimension 8400 comes with an ATX style of Power Supply, that has a maximum rated Wattage of 250 Watts.
1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

Your Power Supply just has enough power to light that LED light.
Weak voltage power rail.
Replace the Power Supply.

[ There are three power rails inside that SMPS.
Switched-Mode Power Supply.

1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail ]

The ATX form factor for a Power Supply refers to the size, and shape of the case, for one.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.
The ATX power supply case in the Dimension 8400 however, is shorter in length.
It is 4 inches Long. (Depth)

Not an advertisement for the website, nor manufacturer.
Reference for the case size, and power cables needed,

http://www.cputopia.com/hp-400w-dell-dimension-8400.html

Scroll down to see the connectors of the various power cables needed.

You may have a Power Supply with these dimensions, and needed power cables, in an unused computer.
Perhaps someone has upgraded to a better computer, and has an unused computer that you can temporarily borrow the Power Supply for a test unit.

Make sure it has at least 250 Watts (Maximum rated wattage), plus,

1) 20-pin ATX main power cable. (Or a 20 + 4-pin ATX main power cable)

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

[ 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4 ]

2) 4-pin ATX +12 Volt power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

Plus the various power cables needed for the Harddrive, optical drive/s, and computer case fan/s, if it/they do not connect to the motherboard.

Oct 21, 2010 | Dell Dimension 8400 power supply ** FREE...

2 Answers

Please Help! I THINK I have a bad power supply (a bestec atx-300-12eb3 rev s2 from a Sony Vaio VGC-RB30). Power will no longer come on at all, however I do have a blinking green light on the back of the...


ok first you disconnect the power supply from motherboard then measure the output voltage if it is ok then there is two wires green and black at o/p of power supply short green and black and see fan is rotating or not if rotating then power supply is ok if not then open the power supply check ac voltage in the pcb if present then check dc voltage after bridge rectifier and ckeck part by part

Feb 23, 2010 | E-Machines Bestec ATX-300-12E Rev. D 300w...

1 Answer

I have a Okia 420ATX power supply. I had it


Based on the additional information that the power supply fan turns on for a few seconds and then goes off indicates to me you have a motherboard or processor problem. I would have a service center check the computer for you.

Feb 03, 2010 | Okia 420w UL Approved ATX Computer Power...

1 Answer

No power at all. what and how to check


Unplug everything but the motherboard and front panel connections. Remove any cards (even the video card) and ram and see if the system comes up (you should hear error beeps and get lights). Install the ram next and retry if the power is up. At the point where the disappears you have found the bad component/ device. If no power lights with everything disconnected but the processor the power supply is bad or mother board is bad. The switch on the power supply is set for your line voltage correct?

Oct 24, 2009 | OCZ StealthXStream / 600-Watt / ATX /...

1 Answer

Pc not switching on even after changing smps. even fan not switching on in smps


Dear,
You can test you smps simply by shorting any of the back wire and green wire. this will switch on your smps withour connecting with mother board. IF it the fan rotate, SMPS is ok.
If you need more trouble shooting on SMPS you have to measure the volate on each wire after powering on.
More info http://www.smpspowersupply.com/connectors-pinouts.html

Oct 13, 2009 | E-Machines 230W Micro ATX Power Supply,...

3 Answers

No power


ok dandan, please tell me you live in nj. I am having the same problem with my puter and did every step you did what is up with this??

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

1 Answer

Bestec ATX-300-12EB3


There should be 12v coming from the yellow wire and 5v from red. Open PC and use a multimeter to check the voltage output connect negative probe to the power supply casing and the positive to the red and yellow wires from the molex connectors. If the readings are below the mentioned voltages then the PSU is faulty. Note if readings can be round off to the given values then the output is fine. cheers.

Nov 22, 2008 | Bestec (ATX-250-12E) 250-Watt Power Supply

2 Answers

Power supply


angeldram3
as i think ur processor over heated. or processor can dos not work fine or heat sink not installed properly. remove heat sink, and use heat sink component (a whithe colour gel. u can buy it any computer accessories shop) use it top of ur processor then attached heat sink. and connect processor fan. before installing heat sink check processor fan. then cleare CMOS by removeing battery (because this problem also can happen wrong frequency setting in CMOS setting).

Jun 29, 2008 | Gateway Bestec ATX-300-12EB3 305w Power...

2 Answers

Pc will not power up


Swimmie
to chack ur power supply open all connector from system board and drive. then conect power cable with powr supply and powr on ur wall outlet switch. than take mother board connector find green color wire and take a small pice of coper wire and connect it with this green wire and a black wire. then chack smps fan is moveing or not if it's moveing then ur smps OK.

Jun 27, 2008 | Okia / 450-Watt / ATX / 80mm Fan /...

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