Question about Dell Dimension 4550 PC Desktop

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J9H2 connector on dell 4550

I put the motherboard of my dell 4550 in a new case and need the pin order and what each pin is for on the J9H2 connector. Can anyone tell me where to find this info? My new case has the standard connectors for front USB and the front controls. Thanks

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Here's a few links to hopefully help you in your struggle cause i own a dell (which i'm using right now) as well and have occasional issues too:

http://answers.yahoo.com/question/index?qid=20081105033803AAYVSaL

http://74.125.95.132/search?q=cache:h2BG70gROrMJ:support.dell.com/support/edocs/systems/dim4550/D0995bk0.pdf+what+are+the+pins+for+on+a+J9H2+connector+on+dell+4550%3F&cd=3&hl=en&ct=clnk&gl=us

http://stason.org/TULARC/pc/motherboards/A/AST-RESEARCH-INC-Pentium-ADVANTAGE-612-221475-F01.html

I hope these help, if you need any more help, contact my email:
romlovespuddingpops@hotmail.com.


Posted on Jun 25, 2009

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I am looking at a Dell Dimension 4550 PC for a friend and it won't boot up...i push the power button on and there is an almost orange/greenish light on the power button... no beeps no diagnostic lights are...


Bad Power Supply. Weak voltage power rail.

[There are three main voltages produced by the Dimension 4550's Power Supply.
1) 3.3 Volts
2) 5 Volts
3) 12 Volts ]

The Power On button LED functions as a diagnostic light also.

Dell Support > Dimension 4550 > Service Manual,

http://support.dell.com/support/edocs/systems/dim4550/

Left-click on Solving Problems, then click on Power Problems

The Power Supply is just an ATX form factor version. The common Power Supply form factor used in MANY desktop computers.
(ATX form factor for a Power Supply refers to the size, and shape of the Power Supply's case.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall)

HOWEVER, (Not shouting), there is an area of concern, should you try a Power Supply you may have available for a test, or purchase one.

It involves the wiring of the 20-pin ATX main power cable. More specifically the power cable's connector.

To explain view the standard wiring, set for a 20-pin ATX main power cable's connector,

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

Looking at the photo to the far right, observe the color code of the wires, going down into the socket holes of the connector.

Look at the Lock tab on the side of the connector. This will help you orient the color code of the wires, and their placement in the socket holes, to the chart below the photos.

The connector on the end of the 20-pin ATX main power cable, is a Male connector.
Where the wires go into the connector, is the Back of the connector.
In the middle photo you can see the Front of the connector.

The wires going down into the ATX main power cable's connector, end in a female metal terminal.
The connector on the motherboard, (Shown in the photo to the Left), has Pins.
The metal female terminals go over the Pins.

The pins are numbered. The color code of the wires match up to the pins.
This is shown in the chart.

Now look at Dell Support > Dimension 4550 > Technical Overview > DC Power Connectors >
DC Power Connector P1

http://support.dell.com/support/edocs/systems/dim4550/techov.htm#1101897

The illustration may not be accurate. You'll have to compare since you have the computer, and Power Supply in front of you.

For a time period Dell was a Proprietary manufacturer.
Meaning they wanted THEIR parts used on THEIR computers, and ONLY THEIR parts.
They had the motherboard manufacturers make motherboards according to their specs.

One of the specifications was that the pins would be CHANGED around, in the motherboard connector for the ATX main power cable.

They also had Power Supply manufacturers make the ATX power cable to their specifications.

This means if a user bought an aftermarket Power Supply, the color code of the wires in the ATX main power cable would Not match.

Many users did buy an aftermarket Power Supply, and installed it.
Burnt motherboards, fried Processors, and graphics cards, resulted.

Orange wires are 3.3 Volts
Red wires are 5 Volts
Yellow wires are 12 Volts.
Black wires are Ground wires.

Guess what happens when you plug a 12 Volt wire into where a 3.3 Volt, or 5 Volt, or Ground wire is supposed to Be?
POOF!

My suggestion would be to look for a Power Supply that is an ATX form factor, is KNOWN to be good, and is compatible, for a test unit.
You, or someone you know may have upgraded to a better computer, and you may be able to borrow the Power Supply for a test unit.

Compatible:
Has the Correct power cables.
1) 20-pin ATX main power cable, OR a 20/24-pin ATX main power cable.
(20-pin connector that has an additional connector with 4 pins. Just use the 20-pin)

2) 4-pin ATX +12 Volt power cable. (Also referred to as P4 MB, and P4 ATX 12V)

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

(Power for the Processor)

3) Enough standard 4-pin Peripheral power cables.
(Misnomered as Molex)

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

(Power for the IDE Harddrive, and Optical drive/s)

Also:
You can change the power wires around in the ATX main power cable's connector.
Change them around, in an aftermarket Power Supply's ATX main power cable's connector.

Want to know how post in a Comment.

Oct 09, 2010 | Dell Dimension 4550 PC Desktop

2 Answers

Can i put a amd processors in a dell dimension


Short answer: NO.

Long answer: AMD processors have a different pin-arrangement than found on a Socket 478 motherboard, so they physically will not fit.

Jul 03, 2010 | Dell Dimension 4550 P4 Socket 478B...

2 Answers

Reformat done and now there is no internet connection. I need the ethernet controller and the sm bus controller. Everywhere I go...they want to download that program that tells me what drivers I need and...


No, you don't need to download the drivers you have to looked for the motherboard installer of your PC, then install the chipset of your motherboard in order for you to use the internet connection.

Jan 21, 2010 | Dell Dimension 4550 PC Desktop

4 Answers

Conections


Hi peju90,

If you've gutted out the old dell computer, then your only talking about a empty case. Put all the right chips and cpu's that the Asus board requires, and you should have no problem with the CD rom or any other hardware. Except if you try and put the hard disk from the dell, it will not have the same configurations, and probably be a bit crazy. But, reformat the drive to it's new board, and your home free.

The power connections will be the same as it was on the old Presario, if you have the old power supply then nothing changes on that. You'll need to hook up the front connectors for USB and Hard drive lights, reset etc, but that would be the ugliest senario. Meaning the csse fit a special connector that the board doesn't carry. In that case you to option, either cut the special connectors and replace them with the ones from the old Presario case, or don't connect them, all but the power, you're gonna need that hooked up, one way or the other.

But, that's as tough as it gets my friend. A case is a case is a case.

Good Luck

Mark

Oct 17, 2009 | Computers & Internet

2 Answers

My Dell Dimension 4550 won't recognize my CPU.


your problem is the same as trying to put a AMD3 into a AMD2 socket, yes it fits and yes i physically should be able to run it it but in reality it won't

Sep 26, 2009 | Dell Dimension 4550 P4 Socket 478B...

1 Answer

SWAP DELL DIMENSION 4550 MOTHERBRD IN AFTER MARKET CHASSIS


If you look closely at the motherboard the pinouts are there. I have always had to play with the reset and power pins and by this I mean that if they don't work right then turn them around. I have also had to put the cable marked reset on the pins marked power. The others are marked (hdd led). I have found this to be true with all dell machines.

Aug 24, 2009 | Dell Computers & Internet

2 Answers

Dell Dimension 4550 will not power on but standby light on.


In all my years of fixing computers, 98% of the time it is the power supply, 2% the motherboard and 0% the switch. Just because the standby light is on does not indicate that the power supply is functioning correctly. The power supply puts out many different voltages....5v, 12v, 1.3v, and 3.3v. If the 3.3 is working then the standby light will come on but if any of the others are not working correctly then the computer won't turn on at all. You can check the switch by checking the resistance of the two wires that the switch are attached to using a multimeter. When the button is depressed, it should go to 0 and when it is not depressed it should be at 1. I would suggest swapping out with a known working power supply to verify the issue.

Jun 25, 2009 | Dell Dimension 4550 PC Desktop

1 Answer

Standby mode


see if there is aproblem with your power supply

Apr 17, 2009 | Dell Dimension 4550 PC Desktop

1 Answer

Dell's Secret to a j9c2 Connector


b578360.jpg This are the details you need. Please rate if useful.

Mar 25, 2009 | Dell Dimension 4600 PC Desktop

1 Answer

Dell dimensio 4550


you need to replace your motherboard. contact vendor

Dec 15, 2008 | Dell Dimension 4550 PC Desktop

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