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Atx power swtich replacement

Switch broke, got new switch. How to connect 2 pin prong to the motherboard? One wire is white and one is green, on the mobo there are pins and a pair is marked pwr sw.
Your help is appreciated
vnfriedman@optoline.net

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The green n white should be labled PW SW and RST
if not then u can c which wire leads to which button
on the mobo, it should say PW SW and RST along with others like HD LED and HDD.
So when you find the which wire is which button then connect them to there identified place on the mobo

Posted on Oct 20, 2008

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Either way will work! No worries, it is just a switch. Just think about it. A jumper wire would work as well, right?

Posted on Oct 20, 2008

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Wont turn on


check connections and if still nothing then the power supply may need to be replaced. Not hard to do,maybe takes 10 minutes to replace one. if you do change power supply contact me and i will help you through it. Not hard to do at all.

Aug 12, 2012 | Compaq Computers & Internet

1 Answer

I triger power switch but dose not work mother board


Check to see if the problem is the Power On switch, or the Power Supply.
Bypass the Power On switch.

http://www.supermicro.com/products/motherboard/Xeon/GC-LE/P4DL6.cfm

[For the motherboard user manual;
Go to the heading, to the upper right in blue - Links and Resources.
{Don't believe we can use the Ampersand on here. Let's try & }

In the list below it click on - Motherboard Manual
Click on the blue - [ Download ] for the second file listed.
MNL - 0660 (English)
P4DL6 / P4DLR / P4DLR+ ]


The SuperMicro P4DL6 motherboard can use a 20-pin ATX main power cable, OR a 24-pin ATX main power cable.

Suggest you use a Power Supply, that has a 24-pin ATX main power cable.
Why?
A 20-pin ATX main power cable, does NOT provide enough power to the motherboard.

General example of a 20-pin ATX main power cable, and it's respective connector on the motherboard,

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

[NOTE*
Color of the connectors does NOT matter ]

General example of a 24-pin ATX main power cable, and it's respective connector on the motherboard,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

Note the additional power wires.
3.3 Volts (Orange), 5 Volts (Red) { 2 of them }, and a Ground wire. (Black)

Which type of ATX main power cable are you using? Don't know. You haven't stated it.

For both,....look at the Green wire. This is the Soft Power On wire.
(Abbreviated as PS_ON)
A jumper wire is used to jump from the Green wire, to ANY Black wire.
ALL Black wires are Ground wires.

Go to the link with the 24-pin ATX main power cable, in it.
Look at the photo to the far right. See the Green wire?
See all the Black wires?

The preferred jumper wire is a paper clip, straightened out, then bent into a U-shape. The middle of the U is wrapped a few times, with black plastic electrical tape. This taped area is for your fingers, and thumb to hold onto.

Turn the U over. Taped middle is up. There are now two 'legs'.
These legs go down into the socket holes, of the Green wire, and ANY Black wire.

One 'leg' down into the socket hole of the Green wire, the other 'leg' down into a socket hole with ANY Black wire.
The 'leg' of the jumper wire, goes down RIGHT NEXT TO the wire already in the socket hole.

The 'leg' has to go down into the socket hole, (Next to the wire already in the socket hole), pretty far.
It has to go past the insulation of the wire, and touch a metal terminal, that is on the end of the wire.

Look at the middle photo. Here you can see the metal terminals, in the socket holes.

Again, Power Supply plugged into power. ATX main power cable plugged into the motherboard, just like the photo to the far right.
The jumper wire makes a contact of no more than 2 seconds.

(Stick the jumper wire down in the socket holes, no more than 2 seconds, then pull it out.
The ATX power on switch is a Momentary Contact Switch )

Power supply comes on? You have a bad Power On switch,

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

Power supply does NOT come on? You have a bad Power Supply.

For additional questions please post in a Comment.
Regards,
joecoolvette

Jul 01, 2012 | SuperMicro SUPER DL6 (P4DL6) Motherboard

1 Answer

Wiring motherboard to a atx tower


The motherboard manual will give you a breakdown of the cast-to-motherboard connections for the board. They differ slightly from board to board, but the connections are almost always found at the bottom front corner of the motherboard. There will be connections for the hard drive LED, the power LED, the power switch, the reset switch, and on some, the speaker (optional). The power switch and the reset switch connectors , 2-pin plugs, are not polarized, meaning that they can be connected to their pins either way without issue. The Power and HDD LED plugs are polarized, as LEDs have a positive and negative. Get this plug backward and the LED won't work. These are also 2-pin plugs. The power LED usually has a green and white wire (Green is +) and the HDD is usually red and white (Red is +) . Some motherboards have color-coded pins -- DO NOT TRUST THEM IF YOU DON'T HAVE A MANUAL -- they are not always standardized. Some motherboards have small print on the board adjacent to the pins to identify them. You CAN trust these. Otherwise, go to the Motherboard manufacturers site and get the manual for the board. The model number is on the board and can be searched for. If the manufacturer's name is not obvious, Google the model number and it will usually lead you to the manufacturer.

Dec 17, 2011 | Intel Motherboard

1 Answer

My computer will not turn on and i was told something is wrong with the motherboard. How do i fix this?


Your computer, Dell Dimension E521 Desktop PC, will not turn on, and someone told you the problem is the motherboard?

Unless you stated to this entity, that you spotted leaking Electrolytic Capacitors on the motherboard, how can they assume this?

I believe you should check whether the problem is the Power On switch, or the Power Supply.

1) The Power On switch is located inside the plastic Power On button. It is an ATX power on switch. (The Power On switch is a Momentary Contact Switch )

This is an example of an ATX power on switch, that I have found fits many desktop computers,

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

The test to perform bypasses the Power On switch. It does NOT involve the Power On switch itself, however.

Bypassing the Power On switch turns the computer (Power Supply) on?
Problem is the Power On switch.

Bypassing the Power On switch does NOT turn the computer (Power Supply) on?
The problem is the Power Supply.

A) Computer on a table, computer unplugged from power, computer case open.
I would then lay the computer on it's side, on a towel, on the table, computer case opening UP.
Watch the cables attached to the computer.

This is so you can access the components inside of the computer more easily. This will become apparent in a moment.
Now 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.
Relieve your body of Static BEFORE reaching inside the computer.

(Have to restate) 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 action will relieve your body of Static.

Should you leave your computer in the middle of working on it, (For ANY reason), be SURE to touch the metal frame again upon your return.

Now you are safe, and the computer is safe. Let's begin;

Inside your computer there is a power cable coming from the Power Supply, that plugs into the motherboard. This power cable I'm referring to is the 24-pin ATX main power cable.

This is an example of a 24-pin ATX main power cable, and it's respective connector on the motherboard,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

Female connector on motherboard shown in the Left photo.
Power cable connector shown in the middle photo.

The photo to the right shows the ATX main power cable plugged into the motherboard.
This is how it needs to be for the test. It also shows the color of the various wires going into it.
We only need to be concerned with Two wires.

The Green wire, and ANY Black wire.

The Green wire is the Soft Power On wire. It is also abbreviated as PS_ON.
ANY Black wire you see is a Ground wire.

A jumper wire is used to BRIEFLY connect the Green wire, to ANY Black wire.
(Again, the Power On switch is a Momentary Contact Switch)

The jumper wire preferred to use is a paper clip. The paper clip is straightened out, then bent into a U-shape.
Look at the U-shape upside down. The top/middle is wrapped a few times with black plastic electrical tape. This is for your fingers, and thumb to hold onto.

The 'legs' of the U-shape go down into the Back of the ATX main power cable's connector.
(I shortened 24-pin ATX main power cable to ATX main power cable)

Look at the photo to the right. See how the Green wire goes down into a squarish socket hole?
Look at the photo in the middle. See the metal tube shapes at the Front of the connector?
Brass looking, slightly square?

These are metal terminals. There is a metal terminal for every wire, going down into the ATX main power cable connector.

The 'leg' of the U-shape jumper wire goes down into the Back of the connector (ATX main power cable connector), RIGHT NEXT TO the existing wire that is in the socket hole.

It has to go down into the squarish socket hole far enough, to pass by the insulation of the wire, and Touch the metal terminal.

Example:
One leg of the U-shape goes down into the socket hole of the Green wire, right next to the Green wire, and touches the metal terminal.

The other leg of the U-shape goes down into a socket hole, with ANY Black wire, and touches the metal terminal pin.

The leg MUST touch the metal terminal pin.

The contact made is brief. No more than 2 seconds. (1001,..1002)

Shock warning. None.
The Soft Power On wire (Green wire) has 5 Volts DC going through it.
In comparison two D cell flashlight batteries produce 3 Volts DC.

HOWEVER, there may be a spark, as both legs of the U-shape jumper wire touch their respective metal terminals. Warning you in advance.

You are also holding onto the black plastic electrical tape. (One wrap of black plastic electrical tape will insulate you from 600 Volts DC)

IF, the jumper wire turns the computer on, (Power Supply actually), the problem is a bad Power On switch.

IF, the jumper wire does Not turn the computer on, the problem is a bad Power Supply.

The Power Supply used in a Dell Dimension E521 Desktop PC, is an ATX (Form Factor) power supply.

The form factor ATX for a Power Supply refers to the size, and shape of the Power Supply's case, and the power cables provided with the Power Supply.

The size, and shape of the ATX power supply case is approximately 6 inches Wide (Width), 5-1/2 inches Long (Length), and 3-1/2 inches Tall. (Height)

With the power cables offered with today's offering of ATX power supply's, there is no need to be concerned if the ATX power supply in question, has the needed power cables.

ATX power supply's sold now, have the correct power cables you'll need, and the correct amount of power cables.

This is just one example of an ATX power supply that will work,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1389575&CatId=1078

Scroll down to the bold heading - Detailed Features
Look at the chart under the subheading - Connectors

Note the first connector shown. This is a 20-pin plus a 4-pin main power cable.
Both power cables are used for your 24-pin ATX main power cable connector, on your motherboard.

This gives a little more information on a 20 + 4-pin ATX main power cable,

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

Note the photo to the right. This particular motherboard has a 20-pin ATX main power cable connector. It does not require the additional 4-pin power cable.
Yours does.

Do Not confuse the 4-pin ATX +12 Volt power cable, with the 4-pin power cable that comes with a 20 + 4-pin ATX main power cable.

The 4-pin power cable you need is in the harness of wires, for the 20 + 4-pin ATX main power cable.

There WILL be a 4-pin ATX +12 Volt power cable, however. This is an example of a 4-pin ATX +12 Volt power cable,

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

(Color of the connectors for any power cable, does Not matter. They can be any color)

Dell Support > Dimension E521 Desktop PC > Service Manual,

http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/index.htm

In the list click on - Technical Overview
Now click on - System Board Components

22 is where the 24-pin ATX main power cable plugs in.

(NOTE*
The 24-pin ATX main power cable connector, and the 4-pin ATX +12 Volt power cable connector, have a Lock on the side. The plastic rectangle on the side of the connector/s.
This Lock has a hook on the bottom end. The end that faces the motherboard.
The hook goes over a Tab on the female connector, on the motherboard.

The Lock acts like a see-saw on a playground. The top of the Lock is squeezed in. This action brings the hooked end away, from the Tab on the motherboard female connector.
Then the power cable CONNECTOR is wiggled, and removed from the female motherboard connector.

{ ONLY use the Connector when removing it. DO NOT pull on the wires)

2 points to where the 4-pin ATX +12 Volt power cable plugs in.
That's it for the Power Supply power cables.

1 points to where the Processor Fan plugs into.
5 and 6, point to where the Data cables from the SATA harddrive, and SATA optical drives, plug into.
(This is if the Dimension E521 has SATA optical drives, and not IDE { PATA} optical drives)

[ The SATA data cable connector has 7 contact pins in it. It is the shorter connector.
The SATA power cable has 15 pins in it. It is the longer connector.

IF, the SATA harddrive has a provision for using a SATA power cable, AND a 4-pin Peripheral power cable (Mislabeled as Molex), ONLY use just the SATA power cable. Otherwise the SATA harddrive will burn out. Sometimes not right away, but eventually it does ]

Going back to the main page for the Service Manual, click on -
Removing and Installing Parts.

Removing the Computer Cover is listed, as well as Power Supply.

For additional questions please post in a Comment.

Regards,
joecoolvette

Nov 03, 2011 | Dell Dimension E521 PC Desktop

1 Answer

How do I get a Compac Presario S6500NX to power on?


If the Compaq doesn't power on with the Power On switch, bypass the Power On switch.
This test will also tell you whether the Power On switch is bad, or the Power Supply.

1) First I suggest you check THAT receptacle IN the surge protector, that the computer is plugged into.

I have had a few surge protectors where just THAT receptacle was bad.


"Hmmm, surge protector power on LED light is lit.
Monitor, printer, and router have power, and they're plugged into the surge protector."

Upon plugging a lamp into THAT receptacle in the surge protector, that the computer was plugged into, proved that receptacle to be bad.

2) To bypass the Power On switch:

A) If you bypass the Power On switch, and the computer turns on, (Power Supply turns on), you have a bad Power On switch.

The Power On switch is located INSIDE, the plastic Power On button.
This is an example of a generic ATX Power On switch,

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

B) If you bypass the Power On switch, and the computer does not come on, the Power Supply is bad.
Replace.
This you can do yourself easily. More on this later.

You won't be touching the wires of the Power On switch.
You will be addressing the power wires in the 20-pin ATX main power cable, and it's connector.

This is a 20-pin ATX main power cable, and the connector on the end of the cable,

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

The Compaq Presario S6500NX uses a 20-pin ATX main power cable.

This is HP Support > Compaq Presario S6500NX desktop computer > Specifications > Motherboard Specifications,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00063254&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=390429

I would like you to scroll down to the illustration of the motherboard, (Asus A7V8X-LA), and to the photo of the motherboard underneath the illustration.

{By the way. If you look at the photo of the Compaq Presario S6500NX at the top right of the page, you will see it isn't accurate. Shows the computer case to be almost square shaped. NOT}

Looking at the motherboard illustration view the Ram Memory slots.
They are marked as DDR DIMM 1 (64 bit, 184-pin module), and DDR DIMM 2 (64 bit, 184-pin module)

To the right is the 20-pin ATX main power cable connector, on the motherboard. It is marked as ATX Power Connector.

Matching it up on the photo, it is the white rectangular connector that has two columns of square socket holes.
10 socket holes per column. 20 total.

When you open your computer case, you will see the ATX main power cable plugged into this white connector.
It will look similar to the photo at the far right in the above Playtool link.

To bypass the Power On switch you will use a jumper wire, to briefly connect the Green wire, and ANY Black wire.

The Green wire is the Soft Power On wire. (PS_ON)
ANY Black wire you see is a Ground wire.

Use a paper clip straightened out, then bent into a U-shape.
The middle of the U-shape is wrapped with electrical tape.
This is where you hold the jumper wire.

The voltage is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
As you can see it isn't a large voltage at all.
You may wish to don a glove on the hand holding the jumper wire.

There may, or may not, be a spark when you make contact with the jumper wire.
Want you to feel safe.
(1 wrap of electrical tape is good enough for 600 Volts DC. Just wanted you to know. Wrap the U-shape jumper wire thick enough so it is easily held by your finger, and thumb)

The jumper wire goes down into the socket hole with the power wire. Goes down right next to the plastic insulation of the wire, and down into the socket hole.

At the end of every power wire going down into the ATX main power cable's connector, is a metal terminal connector. (Female)
The insulation of the power wire goes down into the socket hole pretty deep.

You need to ensure that the jumper wire touches the metal terminal. The jumper wire has to go down in the socket hole until it touches the metal terminal connector.

On end of the jumper wire goes down in the Green wire's socket hole.
The other end of the wire goes down into ANY Black wire's socket hole.

The contact is brief. Works on the same principle as the Power On switch.
The Power On switch is a Momentary Contact Switch.
Touch for no more than two seconds, lift the jumper wire out of the socket holes.

Computer comes on?
Bad Power On switch.

Computer does not come on?
Bad Power Supply.

The Power Supply used in a Compaq Presario S6500NX is an ATX power supply.
(It's also a SMPS if you want to get technical.
Switched-Mode Power Supply)

Uses the ATX Form Factor.
The form factor used by MANY personal computers.
Very readily available.

[ATX Form Factor for a Power Supply's case, is the size, and shape of the case.
Approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall]

It's a 250 Watt power supply, and is a generic unit.
Probably made by Bestec, Delta, or the like.
Maximum rate Wattage is stated at 250 Watts.
Actual maximum wattage for a Power Supply made in this time period, is more like 60 to 70 percent of what is stated.
150 Watts to 175 Watts.

The power cables needed will be supplied with the new Power Supply's.
New power supply's have an ATX main power cable that can be used as a 20-pin ATX main power cable, or a 24-pin ATX main power cable.

They will also come with a 4-pin ATX +12 Volt power cable.
(Usually described by the seller as a P4 12V power cable, or P4 MB)

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

This is one example of a Power Supply that has enough Wattage, correct Form Factor, and correct power cables,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1621514&CatId=1078

Information on how to replace a Power Supply,

1) http://www.fonerbooks.com/r_power.htm

2) http://support.gateway.com/support/manlib/cmponts/process/8508750/08750c01.htm

From me:
Power unplugged from computer, be SURE to follow Anti-Static Precautions BEFORE reaching inside a computer.

Anti-Static Precautions:
Your body carries Static electricity.
Static will fry out (Short Circuit) the hardware components inside a computer.

To relieve your body of Static:
Computer unplugged from power, computer case open, TOUCH the metal frame of the open computer case.

If you get up, and walk away from your computer in the middle of working on it, be SURE to touch the metal frame again upon your return.

For questions please post in a Comment.

Sep 26, 2010 | Compaq Presario S6500NX (DQ181A#ABA) PC...

1 Answer

PC was caught in a lightning storm, and now will not boot (only at random). It seems like it's not getting power, when it does it'll boot normally. But when the storm hit my LAN was disabled and I had to...


Test whether it is the Power On switch, or the Power Supply. Since the LAN card bit the dust, you may be looking at a worse problem, though.

Bypass the Power On switch.

If the Power Supply comes on, the problem is the switch.
[One generic ATX Power On switch, that I have found fits many computers,

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

If the Power Supply does not readily come on, the problem is the Power Supply.

To bypass the Power On switch, you will be using a jumper wire on the
24-pin ATX main power cable connector.

Looks like this,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

(Not necessarily the same color, and isn't located in the same position on your motherboard, as shown in the link)

Motherboard orientation:
Processor to the top, Ram Memory slots to the right.

The 24-pin ATX main power cable connector on the motherboard, is to the near right, of the number 4 Ram Memory slot.

In case you do not have the Owner's Manual, for your Inspiron 530 desktop computer,

http://support.dell.com/support/edocs/systems/inspd530/en/index.htm

On this page left-click on -
Owner's Manual - View - Download - (HTML 3.44MB)

Left-click on - Removing and Installing Parts
Left-click on - System Board Components
(System Board = Motherboard)

Number 7 - main power connector (ATX_POWER), is the
24-pin ATX main power cable connector, on your motherboard.

Referring back to the Playtool link, you will see a wire with Green insulation on it.
This is the Soft Power On wire. (PS_ON)

A jumper wire is used to connect it to ANY Black wire.
ALL Black wires are Ground wires.

[This is a DC circuit. There is a Positive, and a Negative.
A Ground wire is a Negative wire.

The green Soft Power On wire, is a positive wire containing 5 Volts.
You are completing a circuit.
The Soft Power On circuit.
You are bypassing the Power On switch]

There is no splicing of the wires to connect the jumper wire.
The jumper wire will go down into the socket holes, of the 24-pin ATX main power cable connector.

One end of the jumper wire goes down into the socket hole, containing the green Soft Power On wire.
The other end of the jumper wire goes down into a socket hole, with ANY Black wire.

The 24-pin ATX main power cable, is connected to the 24-pin ATX main power cable connector, on the motherboard.
Just as shown in the photo to the far right on the Playtool link.

The back of the 24-pin ATX main power cable's connector, is where the wires come in.
(The front of the power cable's connector is plugged into the motherboard)

I use a jumper wire that is approximately 3 inches long. (7.62cm)
An insulated wire. Both ends of the insulated wire are stripped of insulation, approximately 1/2 inch. (1.27cm)

One bare end of the jumper wire, goes down into the socket hole of the Green wire. Right next to the wire.
It has to go pretty far down in there.

At the end of each power wire, going into the 24-pin ATX main power cable connector, is a metal terminal pin. (Actually is a round hollow metal pin)
The jumper wire's bare end Must touch that metal pin.

The other end of the jumper wire, goes down into ANY socket hole with a Black wire.
(ALL Black wires are Ground wires)

Power Supply (Computer) plugged into power, the jumper wire is inserted.
The contact is a very BRIEF one. No more than 2 seconds.
(The Power On switch is a Momentary Contact Switch)

I suggest you also check the 12 Volt power rail. Check it with everything plugged in, inside the computer, and the computer on.
You need the Power Supply to have a load to get an accurate test.

There are 3 Voltage power rails in the Inspiron SMPS.
(Switched-Mode Power Supply, or just Power Supply for short)

A) The 3.3 Volt power rail
B) The 5 Volt power rail
C) The 12 Volt power rail.

The main one to check is the 12 Volt power rail.
[Orange wires are 3.3 Volt.
Red wires are 5 Volt.
Yellow wires are 12 Volt ]

The Positive (Red probe lead of the multimeter, is connected to any Yellow wire, coming out of the Power Supply.
The Negative (Black) probe lead of the multimeter, is connected to any Black (Ground) wire.

See if there is an unused standard 4-pin Peripheral power cable.
It has 1 Red wire, 1 Yellow wire, and two Black wires.
Connect to the Yellow wire, and to one of the Black wires.

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

[Multimeter function set to DC Volts. If it has it, set it to the 0 to 50 Volt scale]

11 to 13 Volts is Okay, but I prefer the voltage to closer to 12.
11 Volts indicates it's time for a new Power Supply.

Jul 27, 2010 | Dell Inspiron 530 Desktop Computer

2 Answers

The on-off button will not turn the computer on. I shut it off last night using the "shut down" software sequence, clicking two sequential "shut down" icons and waiting for the machine to power off. What...


Yeah I have seen switches fail a few times, its rare though, trace the wire back to your motherboard and disconnect the lead, then short the pins. If it comes on replace the switch, if it doesnt reset the bios via a the jumper and try again, disconnect the long ATX cable from the mother board and all power connectors from peripheral devices and on the Long ATX connector that was connected to the motherboard you will see a green wire, connect your mains to the power supply and short the green wire on the ATX connector with the black wire next to it, the power supply should fire up, if it doesnt try a new power lead and outlet, if it still does not fire up its your powersupply. If however you power supply does power up you should reconnect everything and try your power switch and shorting power switch pins on motherboard again, if the power supply does not come on then yor motherboard should be replaced.

Jun 22, 2010 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

Compaq Presario SR1620NX Desktop won't turn on


I may state too detailed, and over simplify in my solution.
This is not to insult your intelligence, but an endeavor to explain thoroughly.

To bypass the Power On switch, one uses a jumper wire to jump the Soft Power On wire, to ANY Ground wire.

The Soft Power On wire has Green insulation, and is located in the 24-pin ATX main power cable.
ANY wire that has Black insulation is a Ground wire.

To explain:

This is HP Support, and the Motherboard Specifications page, for the Compaq Presario SR1610NX desktop computer,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00378480&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=1127350

I would like you to scroll down the page, until you come to the motherboard illustration.
(Under the - Motherboard layout and photos - heading)

This illustration represents the motherboard from a top view, and with no hardware components installed.
(No Processor, Ram Memory modules, power cables from Power Supply plugged in, and so on)

At the top right of the motherboard is a small rectangle, with an inscription in it.
(The tiny printing reads - SMSC with LPC47M997NR under it)

Immediately below this small rectangle, is the 24-pin ATX main power cable connector.
Two vertical rows of 12 socket holes.
(Next to it is printed - ATX 1)

Now here is a much better view of a 24-pin ATX main power cable, and the corresponding connector on the motherboard,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

The photo to the far left, shows a better view of the 24-pin ATX main power cable connector, on the motherboard.
(Yours may be an opaque whitish plastic. It also will not be located on the outside edge of the motherboard)

The photo in the middle, shows the 24-pin ATX main power cable not plugged in.

The photo all the way to the right, shows the 24-pin ATX main power cable plugged in, and shows the Green Soft Power On wire.
Also shows the Black ground wires.

The 24-pin ATX main power cable is left plugged into the motherboard.

Looking at the middle photo once more, note how the power wires come into the connector.
This is the Back of the connector.

Each wire ends in a metal terminal.
The metal terminal is approximately 1/2 inch in length.
This means the power wire goes down in the connector pretty deep, before it ends in the metal terminal at the Front of the connector.

I use a wire that is approximately the same size, (Gauge), as the power wires, for the jumper wire.
Strip around 1/2 inch of insulation, from each end of the jumper wire, then twist the wire ends.

The jumper wire should be around 3 inches in length, and bent into a U-shape.

Power supply unplugged from power, insert one end of the jumper wire into the socket hole that contains the Green wire.
(Soft Power On wire)

The jumper wire end is stuffed down into the socket hole with the Green wire, right next to the Green wire. You are pushing the bare stripped end past the insulation of the Green wire, with the intent of touching the metal terminal end.

Insure that the stripped bare wire, is touching the metal terminal end, as best as you can.
The stripped end may have to be longer than 1/2 inch.

(An alternate form of jumper wire is a paper clip straightened out, then bent into a U-shape, with wraps of tape in the middle for insulation. I have used this method also. I just don't recommend it for solutions)

Power supply plugged back into power:

With the one end stuffed down into the socket hole for the Green wire, hold the jumper wire by the insulation, and touch the other end down into ANY socket hole that has a Black wire. (Ground)

Warning!
There may be a spark. You may wish to wear a glove on the hand for the jumper wire.
The voltage is 5 Volts (DC)

Two common flashlight batteries are 3 Volts. (DC. Each battery produces 1.5 Volts)

To me it isn't a big deal if there is a little spark. Wanted to advise you beforehand, so that you would be aware, though.

The Power On button that you push is made of plastic. Located inside it is the Power On switch.
With finesse the Power On switch can be removed, and a new one inserted.

(I use a hair dyer on low heat setting, and move the hair dryer back, and forth to gently soften the plastic, so that tabs can be eased to one side, and the Power on switch removed.

The Power On button/switch assembly can also be lowered, {Removed from computer}, into a bowl of very, very warm water, to soften the plastic Power On button. The switch will be removed, and thrown away. The plastic Power On button is then dried, and readied for the new Power on switch)

(Barring the worst case scenario, if a correct Power On switch cannot be obtained, a Power On switch can be used by itself, and would just hang outside of the computer. Not very aesthetically appealing, or professional, but the computer will work again)

I have found that this generic Power On switch, seems to be a correct substitute for most computers,

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

Ebay may have one in Computers and Networking>Computer Components.

Older computers, used a different method to turn the Power Supply on.
(PSU - Power Supply Unit)

The Power On button pushed against a long metal rod, which in turn pushed against a Power On switch, located in the Power Supply.

The Power Supply in your computer always has a constant 5 Volt standby power, when the Power Supply is plugged into power.

When the Power On button is pushed, it pushes against the Power On switch.
Inside the switch is a convex shaped thin disk of metal.

The 'plunger' of the switch, pushes against the middle of the convex metal disk.

The outside edges of the disk are connected to Ground.
When the convex disk flattens, the middle touches a Positive connection.

This contact is Momentary.
The Power On switch is a Momentary Contact Switch.
When you let go of the Power On button, the disk resumes it's convex shape, and the brief connection is broken.

The Power On switch wires connect to pins on the motherboard.
The area the pins are in, is the Front Panel header.
(A connector on a motherboard is referred to as a Header. The plastic piece on the front of a computer is a Front Panel. Sometimes referred to as a Front Bezel)

To remove the Front Panel to your computer, far enough to easily access removing the Power On switch, the Power On switch wires will have to be disconnected from the Front Panel header, on the motherboard.

So will all the wires leading from the Front Panel, to the Front Panel header on the motherboard.

Looking back at the motherboard illustration, the Front Panel header is located on the very bottom right of the motherboard.

JFP1
(Junction Front Panel 1)

You will note that there are two rows of pins.
Four across the top row, five across the bottom row.

BEFORE (Not shouting) you attempt to remove the Front Panel, it would behoove you to make a drawing, and notes as to where those wires go.
If wires come loose, I don't have a way at present to tell you where they go.

It has been a while since I have worked on this series of Compaq Presario's. The wires from the Front Panel may just end in a single connector, that you simply line up with the corresponding pins on the motherboard, and plug the connector in. (On?)

The connector is oriented, by the pin in the Front Panel header that is missing.
Four pins across the top, with one missing.
Five pins across the bottom.
The connector will also have one hole blocked off, to match the pin layout of the Front Panel header.

The other wires from the Front Panel though, may not end in a single connector.
These headers are for the audio connections on the Front Panel, USB ports, and so on.

I'll await your diagnoses to see if a new Power On switch is required, or a new Power Supply.
If it is a new Power Supply that is required, I will give recommendations, and why, if you wish.

Should you have any questions, I will try to reply as speedily as possible.

May 23, 2010 | HP Compaq Presario SR1620NX...

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