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I get no output from an LC-350 ATX BIAS SUPPLY

When I hit the power switch on the computer the systems fan twiches about 45 degrees and stops. I do not have a schematic diagram for this unit. How can I get one, and what should I be looking at ??
The wires are all color coded and feed into a 20 pin connector.
The mother board is P4VMM2. No leds light up at all when the power switch is operated, but the fan motor always twiches once, upon operation.
Thanks Tibor

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  • Celenous May 11, 2010

    This could be so many things. Please provide more information. What were you doing when you first experienced the problem? What is your memory configuration? What type of memory are you using? Did you mix DDR and SDRAM? Have you verified that the fan is working correctly? It might not be the power supply but the motherboard itself or one of the components in it. Here is a link to the manual for the motherboard.
    http://www.ecs.com.tw/ECSWebSite/Downloa...
    Send me the specs of your system and we can work out what the issue is.

    Cheers,
    Celenous


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DOES THE SWITCH HAVE 4 REMOVABLE CONNECTION, IF SO THE POWER SUPPLY MAYBE HOOKED UP WRONG, REMOVE ALL WIRES AND CONNECTION FROM THE MOTHERBOARD LEAVE ONLY THE POWER CONNECTION AND THE VEDIO MONITOR CABLE, ADD ONE CONNECTION AT A TIME AND TURN SYSTEM OFF AND ON UNTIL YOU HAVE A PROBLEM AND I KNOW IT IS ALOT OF WORK THAT WHY YOU PAY SO MUCH FOR A COMPUTER EXPERT TO LOOK AT YOU COMPUTER DESKTOP OR LABTOP.

CANDYMANGANDY

Posted on Jan 27, 2009

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Does a ATX power transformer makes the difference of watts of a power supply unit of a computer? Exactly I am planning to improve performance of my pc's ATX power supply unit. Trying to attach another...


NO NO NO... PC power supplies are switching supply's. The transformers use high voltage to drive other components. Increasing the power out of the supply will require you to upgrade the power supply to a higher wattage output.

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Compaq presario sr5110nx will not start


When the power light is not Green it indicates a bad Power Supply.

The Power Supply in your computer is an ATX model.
ATX is the Form Factor.

The ATX form factor for a Power Supply is;
1) The case measures approximately 6 inches Wide, 5-1/2 inches Long, and 3-1/2 inches Tall.

The power cables also detail the ATX form factor,

http://en.wikipedia.org/wiki/Power_supply_unit_%28computer%29

Scroll to the bottom of the page, and look at the chart to the right;
24-pin ATX12V 2.x power supply connector.

[ Your Power Supply is also a SMPS.
Switched-Mode Power Supply,

http://en.wikipedia.org/wiki/Switched-mode_power_supply ]

The maximum rated Wattage is 300 Watts.

Primer:
A) IF, all of the LED light were on at once, they would use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use from 51 to 125 Watts of power.

Your power supply doesn't even have the power to spin fans, much less turn the Processor on.
Bad power supply.

This is an example of a decent, reliable ATX power supply replacement,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4844034&CatId=4324

Replacing the Power Supply;

This is HP Support > Compaq Presario SR5110NX Desktop PC > Manuals page,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3436819&

Left-click on the top file listed in blue - Upgrading and Servicing Guide

NOTE*
This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
It may take up to 30 seconds before the first page comes up.

Shows you how to open the computer case. (Removing the side panel)

This details out replacing the Power Supply,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01355925&tmp_task=useCategory&cc=us&dlc=en&lang=en&lc=en&product=3436819

NOTE*
The plastic front of your computer is the Front Panel.
The area of pins on the motherboard, that the wires from the Front Panel go to, is the Front Panel header.

When replacing a Power Supply it is easy to accidentally disconnect one, or more of these wires. I do not know if a pinout chart for the Front Panel header is available.

I suggest you use a good light, and your cell phone, or digital camera, to take a few photos of the connections, of the wires going to the Front Panel header.
If a wire or two is disconnected, you have photos.

Also:
1) UNPLUG the computer from power before you start.
Follow Anti-Static Precautions.

Anti-Static Precautions:
Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components inside a computer. (Laptop or Desktop)

Computer on a table, computer unplugged from power, computer case open.
TOUCH an unpainted surface, of the metal frame of the open computer case.
This simple action will relieve your body of Static.

Should you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return.

IF, you have ANY questions as to where the various power cables go, or an associated question regarding Power Supply replacement, please state in a Comment.

Regards,
joecoolvette

[ You press the Power On button. The first chipset to receive power is the BIOS chipset.
{ Basic Input/Output System}

The BIOS program is initialized.
BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor on, then hands the computer over to the Operating System.

Windows XP and Windows 7 are two examples of an O/S.
Operating System ]

Dec 25, 2011 | HP Presario Computers & Internet

1 Answer

I have presently a atx 350w power supply would yours solve my supply problem


If your ATX switch mode power supply is faulty then I suggest you replace it with a new one that is 350 watt or higher wattage.
Fixing faulty ATX power supplies is not a DIY project, there are dangerous voltages in these power supplies and can cause death or serious injuries.

Jan 30, 2011 | AMD Codegen 350W ATX P4 Recommended...

2 Answers

How to power up a compaq 243890-001 power supply without the the motherboard? Its not green to ground


Remove Power Supply
1 . Shut down your computer and unplug the power cord and all cables connected to the system.

2 . Open the computer case and disconnect all power connectors from the motherboard, drives, cards and fans.

3 . Remove the four screws that secure the power supply to the case. These screws are located on the back of the computer case, at each corner of the power supply.

Wire and Start Power Supply
1 . Switch the power supply to the "Off" (sometimes "O") setting.

2 . Insert the end of one wire from a single pole, single throw (SPST) switch into the green wire of the ATX power connector (the largest power supply connector).

3 . Insert the end of the other wire from the SPST switch into the black wire of the ATX power connector. If your power supply has two black wires, connect the SPST to the black wire directly beside the green wire.

4 . Wrap electrical tape around the ATX power connector and wires from the SPST switch to hold them in place. Make sure there is no exposed copper or silver wire from the SPST switch wires.

5 . Turn the SPST switch to the "Off" position, if not already set. Plug the power supply into the wall outlet and switch it to the "On" (sometimes "I")setting.

6 . Connect any other computer components that you wish to operate without the motherboard, such as fans, drives or cards. Turn the SPST to the "On" setting to activate the power supply.


Hope the above information will be helpful to you.
Thanks.

Dec 01, 2010 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

The controller will not turn on. Green light on back comes on but when we turn on the unit, the fan starts briefly and then the power cuts off.


Bad Power Supply. Weak Voltage power rail.

Not enough power to turn the Processor on, and keep it on.

1) ALL those LED lights together, 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. Depends on what Processor it is. (Older Processors use less Wattage)

The Compaq Presario SR1810NX desktop computer, comes with an AMD Sempron 3200+, processor.

(Uses the Socket 939 processor socket)

[Maximum operating capability is a 1.8GigaHertz frequency rate.
1.8GHz

Giga = Approximately 1 Billion
Hertz stands for Cycles per Second.
Frequency Rate is correct computer speak for 'Speed'
The AMD Sempron 3200+ processor, can operate at a maximum frequency rate of 1.8 Billion Cycles per Second ]

HP Support >Compaq Presario SR1810NX desktop computer > Product Information > Product Specifications,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00609384&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&product=1841795&lang=en

The AMD Sempron 3200+, can use up to 62 Watts,

http://en.wikipedia.org/wiki/List_of_AMD_Sempron_microprocessors#.22Palermo.22_.28Socket_939.2C_E3_.26_E6.2C_90_nm.29

(Palermo Core)

When you press the plastic Power On button, you are contacting a Power On switch inside it.
(Typical ATX Power On switch,

http://www.directron.com/atxswitch.html )

When an ATX power supply is plugged into power, there is a 5 Volt Standby power, present inside the power supply.

Pressing the momentary contact power on switch, closes a circuit that directs the 5 Volt Standby power to 'excite' the power supply, and turn it on.

The first chip to receive power is the BIOS chip.
[Chip and Chipset are slang terms for I.C.
Integrated Circuit.
BIOS stands for Basic Input/Output System]

BIOS,

http://en.wikipedia.org/wiki/BIOS ]

BIOS looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System.
(Windows XP is one example of an O/S. Operating System)

The LED lights receive power, so do the fans, and the Harddrive. When it's time for the Processor to kick on, there isn't enough power, and the Power Supply 'falls to it's knees'.

Replace the Power Supply.
It's just one of the basic ATX power supply's that are readily available in a multitude of places.
The Wattage is 300 Watts.

The ATX form factor for this power supply, (Size and shape), is approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall.

Power cables needed:
(Continued in a Comment)

Aug 02, 2010 | Compaq Presario SR1810NX Sempron 3200+ 1.8...

2 Answers

Not sure if power supply is good??


The supply fan won't run unless you turn the supply on. You can do this by shorting the PS_ON pin on the output connector to an adjacent ground pin. (This page has a nice diagram of the power supply connector.) And just because the fan starts turning, it doesn't mean the supply is good.

Measuring the output of the supply without a load can give misleading results. Especially with a digital voltmeter, outputs can look good but drop too low under load to run the computer. You can buy a power supply tester from several sources that you plug the supply into, but nothing beats an operational test in the system.

New power supplies are quite inexpensive. It might just be easier to buy one if you have any concerns that your current supply isn't working. You can also test the supply in another computer. If that one shows the same trouble as the one you pulled the supply from, you know the supply is responsible. Otherwise you know you have more troubleshooting to do in the rest of the system.

Hope this helps, and thanks for using Fixya!

Mar 27, 2010 | Dynex (DX-PS350W) (DXPS350W) 350-Watt...

1 Answer

Need fan for Okia 350 ATX


its the bearings in the fan starting to pack up, best way is to stop the fan spinning when its on with a small pencil and this should re- align the bearings in the fan and stop the noise, you will need a new powersupply the fan is on the way out, just a temp. fix for you to stop the irritating noise

Jan 28, 2010 | Okia 350w UL Approved ATX Computer Power...

1 Answer

Upgrade for Bestec ATX-1956D (HP p/n: 0950-4106)


How about the LC Power LC350M Micro ATX - 380 Watt

or the 

Logisys 350W Micro ATX

They should fit your form factor and output as much as 350W being relatively cheap, but neither gets 18 amps on 12V rail...
I think no power supply of that size has an output like that...think about a cheap but substancial chassis upgrade if you need that power...Have a look at directron for the PSUs.

Feb 13, 2009 | HP Bestec ATX-1956D 200w HP Part No...

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