Question about HP Compaq Presario SR2020NX PC Desktop

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I disassembled the power switch to a Compaq Presario SR 2020nx. Now I cant remember the pin layout. Can you help

I have tried to rearrange pin order

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One way it will work one way it wont

Posted on Dec 12, 2014

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I disassembled the power switch to a Compaq Presario SR 2020nx. Now I can't remember the pin layout. Can you help


do you mean the "AT-ATX" connector cable to the motherboard?
if yes they are all the same http://www.smps.us/atx-pinout.png
else i don't understand what you mean (post a photo next time)
bye

Dec 11, 2014 | Compaq Computers & Internet

1 Answer

Need wiring diagram for placement of the internal cables in Compaq Presario SR5410F


Top view photo of the motherboard, of an MSI MS-7525 motherboard made FOR HP by MSI, for a Compaq Presario SR5410F Desktop PC,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01386897&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3686678

Also scroll down the page, and click on the + sign to the left of -
Motherboard Layout.

A) 24-pin ATX main power cable:

In the photo, look to the right of the Blue ram memory slots.

The Yellowish/Whitish connector to the right of them, with two columns of 12 socket holes, is where the 24-pin ATX main power cable plugs in.

In the Motherboard Layout it is marked by - ATX1

This is a 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 middle photo, and the Lock on the side of the power cable's connector. The Lock has a hooked end that goes over a Tab, on the motherboard's connector.

The Lock works like a see-saw on a playground. The top is squeezed in, and this brings the hooked end away from the Tab, in order to remove the power cable.
When assured that the power cable is plugged in tightly, and therefore correctly, the hooked end of the Lock will be over the motherboard connector's Tab.

B) 4-pin ATX +12 Volt power cable:

In the center of the motherboard, under the Processor socket, is the Northbridge chip. (Part of the motherboard chipset)
It is under a finned aluminum Heatsink, that resembles a meat tenderizer's head.

Draw an imaginary line up above it, in-between the Processor socket, and the aluminum finned Heatsink, and go straight LEFT.
See the whitish 4-socket hole square connector?

In the Motherboard Layout it is marked by - JPW1

This is where the 4-pin ATX +12 Volt power cable plugs in. It is power for the Processor. Has the same locking setup as the 24-pin ATX main power cable, and it's motherboard connector.

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

C) In the Motherboard Layout to the top left corner of ram memory Slot 1, (DIMM1), is where the Processor fan connects.
CPU_FAN1

D) In the Motherboard Layout just below JPW1 is where the computer case fan plugs into. SYS_FAN1

E) In the Motherboard Layout - SATA1 - is where the SATA Harddrive data cable plugs into. (Below ram memory slots)

http://en.wikipedia.org/wiki/File:SATA_ports.jpg

The SATA power cable from the power supply, plugs into the SATA harddrive. Note that the SATA power cable's connector, is longer in length than the SATA data cable's connector.

[SATA power cable has 15-pin. SATA data cable has 7-pins ]

Note that both cable's connectors, have an L-shape on the inside.

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

NOTE*
This is what a 4-pin standard Peripheral power cable looks like,

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

IF, your SATA harddrive has a provision for a SATA power cable, AND a 4-pin standard Peripheral power cable, ONLY use just the SATA power cable!

Otherwise you will burn up the SATA harddrive. May not happen right away, but I assure you it will happen!

[ A note on SATA.
The beauty of SATA, is that you can plug into ANY SATA connector on the motherboard, and BIOS will see it.

If you plug the Harddrive into SATA 1, or SATA 2, or SATA 3, or SATA 4, connector on the motherboard, IT DOES NOT MATTER.
BIOS will find the Harddrive, or optical drive ]

The Front of your computer is the Front Panel.
The area of contact pins on the motherboard, that the main wires from the Front Panel go to, is the Front Panel header.

In the Motherboard Layout illustration, the Front Panel header is down at the Bottom/Right corner, and is marked - JFP1.
(Right in the very bottom/right corner is JUSB2. JFP1 is right above it)

JFP1. Junction Front Panel 1.
9-pin header. Black rectangle.
5 pins on the Right side, 4 pins on the Left side.

The pins are numbered EVEN on the LEFT side.
Starting on the BOTTOM going UP;
Pins 2, 4, 6, and 8. There is NO Pin 10.

The pins are numbered ODD on the RIGHT side.
Starting on the BOTTOM going UP;
Pins 1, 3, 5, 7, and 9.

A) Pins 1 and 3 are for the HarDDrive activity LED.
(Light Emitting Diode, so it is a light )

Pin 1 is for the Positive ( + ) wire. If the HDD LED is dim when the harddrive is active, switch the wires around.

B) Pins 5 and 7 are for a Reset switch, IF a Reset switch is used.

C) Pin 9 is N/C. Not Connected. 5 Volt power, and reserved for the factory to use.

D) Pins 2 and 4 are for the Power On LED.
Pin 2 is for the Positive ( + ) wire.
If the PWR ON LED is dim when the computer is on, switch the wires around.

E) Pins 6 and 8 are for the Power On switch.

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

Aug 14, 2012 | HP COMPAQ Presario SR5410F Pentium...

1 Answer

Compaq presario desktop will not turn on


Check the power cables if it is working properly.
See if your AVR didn't blow a fuse or the switch is working and the led light are lighted or is powered on.
Test your pc's switch if it is still established contact and not unpluged from *********** board and is working properly.
Test your power supply by unpluging all plugs that is connected to your motherboard and try to short out, the green and black wire from pin 4 and 5 see picture below. Just put a small length wire at pin 4 and five and you'll be able to know if it is working just fine.

nhrtz_0.jpg


Connect it to your computer again if it is working properly.
Press the power switch.
If it still is not working, try to disassemble your processor, then press the power switch.
If it still did'nt work or still doesent turn on, then your motherboard is the broblem and needs to be replaced. Have a nice day friend, and hope this could help you analyze.

Aug 19, 2011 | Compaq Presario 5000 PC Desktop

1 Answer

I can't my dvd to work on my pc its a compaq presario sr 2020nx


i had the same tower as you. there are a number of reasons why it might not work. are you talking about a dvd or a dvd drive?

May 02, 2011 | HP Compaq Presario SR2020NX PC Desktop

3 Answers

What is the watt for a power supply for a compaq presario sr2020nx. the computer will not turn on. i checked all other possible power sources.


Looks like it comes with a 550w power supply, so anything in that range would be fine. Below are the specifics if you need them.
Best of luck, William
-------- " Replacement power supply for Compaq Presario SR2020NX- 550 Watt Replacement Power Supply Upgrade
- One (1) 20+4 ATX Power Connection
- Two (2) SATA Connections
- Four (4) large molex connector (4-pin)
- One (1) One (1) floppy connector (4-pin)
- One (1) ATX 12V connector (4-pin)
- One (1) 6-pin PCI-Express Connection (6-pin)
- ATX Form Factor
- 575 Watt Replacement Power Supply
- Input Voltage: 100 - 240 Volts AC
- Width: 5.75"; Height: 3.25"; Depth: 6.0"
- Voltage: +3.3V (38A); +5V (40A); +12V (25A); -5V (0.5A); -12V (0.8A); +5V (2A)
SATA Support
- Supports both 20 and 24 pin motherboard. Great Power Supply Replacement or Upgrade. Compaq PSU Presario SR2020NX Power Supply Replacement"

Mar 03, 2011 | HP Compaq Presario SR2020NX PC Desktop

1 Answer

Power switch will not power comnputer - does anyone know exactly what I need to fix this problem and where to order.


Presario power switch assemblies are only made for and sold by HP. If the manufacturer will sell you one (which I doubt) you will need to contact them at HP.com.

There is nothing unique about a power switch, any momentary on contact will work. Have you tried shorting the two pins to see if it is actually a switch problem?

May 17, 2009 | Compaq Presario 6350US (808736414036) PC...

1 Answer

Power and reset switch and hdd led layout on P4Vmm2 mother board


[10][ 9] Pin 1 = +HDD pin 3 = -HDD LED
[ 8][ 7] Pin 2 = + POWER pin 4 = - power LED (SPD)
[ 6][ 5] Pins 5 & 7 = reset
[ 4][ 3] Pins 6 & 8 = Power switch
[ 2][ 1]


Hope you find this Useful

Dave

Nov 19, 2008 | EliteGroup P4VMM2 Motherboard

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