Question about HP ATX-300-12Z (ATX30012ZBD) 300-Watt Power Supply

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ATX-300-12Z was hit with a power surge (thought we had a surge protector). Green light on power supply blinking at 2X/second. No power at USB devices (or anywhere else.) PC was on when surge hit.

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There were 2 Switching power supply circuit inside the ATX PSU. There's a Standy PWM circuit whichSupply +5V to the PWM IC of the Main PWM. Stand by pwm still working or insufficient voltage, lower than +5V. This is the reason you still have Green light. Check or replaced small filter capacitor around 100 MFD 16V, open resistor or shorted diode that was nearest of the PWM IC..
Watch out for charge voltage on big capacitors.

Rleo

Posted on Jan 20, 2011

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Green light blinks three times but T.V won't power on


Power supply probably fried. You will have to take the TV apart to test.

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My computer won't turn on. Everything's dead.


1) Check to make sure your surge protector has power. Power On LED light is lit.

2) Check THE receptacle, in the surge protector that the computer is plugged into.
I have had a few bad surge protectors where just THAT receptacle was bad.
"Hmmm, surge protector Power On LED light is lit.
Monitor, printer, and router plugged into the surge protector have power."

Plugged a table lamp into THAT receptacle in the surge protector, that the computer was plugged into, found it to be bad.

3) Perform the test to check whether it is a bad Power On switch, or a bad Power Supply.

The Power On switch is located inside the plastic Power On button.
This is a generic Power On switch (ATX), that I have found fits many computers,

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

The test involves bypassing the Power On switch. Has nothing to do with the Power On switch wires.
A jumper wire is used on your 20, or 24-pin ATX main power cable's connector.

The jumper wire goes from the Soft Power On wire, (Also referred to as PS_ON. It is a Green wire), to ANY Black wire in the main power cable's connector.

Since you didn't post what computer you have, (Computer manufacturer, and Model Number), I have to give you generic information.
It may also be, that there is no direct information available for the computer you have.

1) This is a 20-pin ATX main power cable, and it's connector,

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

2 This is a 24-pin ATX main power cable, and it's connector,

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

[Older computers use the 20-pin ATX main power cable. Later computers needed more power to the motherboard, hence 4 more power wires were added. 24-pin ATX main power cable ]

Computer unplugged from power, observe Anti-Static Precautions.

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

Computer on a table, computer unplugged from power, computer case open; TOUCH the metal frame of the open computer case.
This will relieve your body of Static.

While working on your computer your hands, and forearms should occasionally touch the metal frame.
But if you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return ]

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

If you bypass the Power On switch, and the computer Does Not come on, (Power Supply), you have a bad Power Supply.

The test is to use a jumper wire on the 20, or 24-pin ATX main power cable's connector.
The jumper wire connects from the Soft Power On wire, (Green), to ANY Ground wire. (ALL Black wires are Ground wires)

The 20, or 24-pin ATX main power cable is plugged into the motherboard.
The Power Supply, (Computer), is plugged into power.

Use one end of a jumper wire, to go down into the socket hole with a Green wire, and the other end of the jumper wire to go down into a socket hole, with ANY Black wire.

The jumper wire must go down into the socket hole pretty far.
The jumper wire goes down into the socket hole, right next to the wire that is already in the socket hole.

The jumper wire has to go down in the socket hole far enough, to touch a metal terminal that is on the end of the wire.
I realize that this may look complicated on 'paper', but I'm just being very detailed.

Most use a jumper wire made from a paper clip. The paper clip's diameter is thin enough to slide down into the socket hole, right next to the wire that is already in the socket hole. (And touch the metal terminal at the bottom of the wire)

The paper clip is straightened out, then bent into a U-shape.
Black plastic electrical tape is wound around the middle of the U-shape.
The taped part is what you hold onto.

The voltage for the Soft Power On wire, (Green) is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
Just in case you have reservations.

There may be a spark. Warning you in advance.
You may wish to use a glove, on the hand that holds the jumper wire.
Just make a brief contact with the jumper wire. No more than 2 seconds should suffice.

If the Power Supply comes on, you have a bad Power On switch.
If the Power Supply does not come on, you have a bad Power Supply.
No if's, and's, or but's about it.


Tell me the computer manufacturer name, and model number, and we'll see if a compatible Power Supply can be found.
Post in a Comment.

Oct 06, 2010 | Computers & Internet

1 Answer

My desktop computer wont power on


Suggest you see if the problem is the Power On switch, or the Power Supply.

(First check to see if the receptacle in the surge protector, that the computer is plugged into, has power.
Have had a few bad surge protectors, where just THAT receptacle was bad.

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

Plugged a lamp into THAT receptacle, and found it to be bad)

To test whether the Power On switch, or the Power Supply is bad, a jumper wire is used to bypass the 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, that I have found fits many computers,

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

The jumper wire is used on the 20, or 24-pin ATX main power cable's connector.
While still plugged into the motherboard.

The jumper wire connects to the Soft Power On wire, (Green), and to any Ground wire. (Black)

Example of a 20-pin ATX main power cable, and it's respective connector,

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

Example of a 24-pin ATX main power cable, and it's respective connector,

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

Using the jumper (Wire) to bypass the Power On switch, turns the Power Supply on?
The problem is a bad Power On switch.

Using the jumper to bypass the Power On switch, does Not turn the Power Supply on?
The problem is a bad Power Supply.

There is a correct procedure for performing this test.
Post back in a Comment if you wish to know.

Regards,
joecoolvette

Sep 20, 2010 | Computers & Internet

1 Answer

My computer will not turn on.


Suggest you start with checking the receptacle in the surge protector, that the Computer is plugged into.

I have had 3 surge protectors now that just THAT receptacle was bad.

"Hmmm, surge protector LED power on light is lit.
Monitor, printer, and router, plugged into the surge protector have power."
Plugging in a lamp into the receptacle in the surge protector, that the computer was plugged into, proved just THAT receptacle was bad.

Not an issue?

Then I suggest you check to see if the problem is the Power On switch, or the Power Supply.

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

The test is to use a jumper wire for the Soft Power On, and bypass the Power On switch.

If the Power Supply comes on, the problem is the Power On switch.
If the Power Supply does Not come on, the problem is the Power Supply.
Bad Power Supply.

Dell Support, and the Service Manual main page, for the Dimension E310,

http://support.dell.com/support/edocs/systems/dim3100/en/sm/index.htm

If you click on Technical Overview, then on System Board Components, you'll be taken to this page,

http://support.dell.com/support/edocs/systems/dim3100/en/sm/techov0.htm#wp1058089

Here you will see an illustration of your motherboard. This is a Top view. The view you will see when you open your computer case.
(Main menu - Removing the Computer Cover)

The number 9 points to the ATX main power connector on the motherboard.
Viewing closely you will count 24 socket holes.
12 on top, 12 on bottom.

This connector is a 24-pin ATX main power cable connector.

If you scroll down the page to the heading - Power Supply DC Connector Pin Assignments, and to the heading underneath - DC Power Connector P1, you will see the Dimension E310 has a 24-pin ATX main power cable.

This is a more in-depth view of a typical 24-pin ATX main power cable, and it's respective connector, plus a view of a typical 24-pin ATX main power cable connector, on a motherboard,
(Not a Dell Dimension E310),

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

The photo to the far Left, shows a 24-pin ATX main power cable connector, on a typical motherboard.
There is no 24-pin ATX main power cable plugged in.

The photo in the middle, shows a 24-pin ATX main power cable.

The photo to the far Right shows the 24-pin ATX main power cable plugged into the connector.

In the photo to the far Right you will see that one of the power wires has Green insulation.
This is the Soft Power On wire.
Also abbreviated as PS_ON

You will see many wires with Black insulation.
ALL of these wires are a Ground wire.

The jumper wire is connected to the Soft Power On wire, (Green), and to ANY Ground wire. (Black)

The method is to insert one end of a jumper wire, into the socket hole with the Green wire, and the other end into a socket hole with a Ground wire.
(ANY Ground wire)

Again looking at the photo to the far Right, you will see that the power wires go down into individual socket holes.
The insulation of the power wires goes down into the socket hole pretty far.

At the end of each power wire is a metal terminal. It is a female terminal.
This is what it looks like,

http://www.alliedelec.com/search/productdetail.aspx?SKU=8630463

The jumper wire must go down into the socket hole, (Right next to the existing wire already in the socket hole), far enough to touch that metal terminal pin.

it has been suggested to use a paper clip.
The paper clip is straightened out, then bent into a U shape.
The center of the U shape is wrapped with black electrical tape.

The taped area is where you hold the 'jumper wire'
You may wish to wear a glove also.

The voltage is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.

There may be a spark.
Hence I advised wearing a glove. Not so much for your safety, but for your peace of mind.

One end down into the socket hole with the Green wire, (Soft Power On), and the other end down into ANY socket hole with a Black (Ground) wire.

The contact period used is no longer than 2 seconds.

If the Power Supply comes on, you have a bad Power On switch.
If the Power Supply does Not come on, you have a bad Power Supply.

The Power Supply can come on, and still be bad. Weak voltage power rail.
Enough power to light LED lights, and perhaps spin fans, but not enough to turn the Processor on.

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.

Post additional questions in a Comment.
Regards,
joecoolvette

Sep 13, 2010 | Dell Dimension E310 PC Desktop

1 Answer

No power cannot turn on


Suggest you check the simple stuff first.

Not checking is akin to a car that won't start, and tearing apart the entire fuel system, only to find it was just out of gas.

1) Make sure the receptacle the surge protector is plugged into, has power. Surge protector Power On light should be lit.

2) Check THE receptacle in the surge protector, that the computer itself, is plugged into.
Have had a number of expense surge protectors, where just THAT receptacle was bad.

("Hmmm, surge protector Power On LED light is lit. Monitor, printer, sound system, and router plugged into the surge protector has power. Should be good to go.

NOT!
Plug a table lamp, or similar device into THAT receptacle.
Make SURE it has power)

Surge protector, and receptacle in surge protector checks out?
Bypass the Power On switch.

See if the problem is a $5 Power On switch, or the Power Supply.

(Generic ATX Power On switch that I have found fits many computers,

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

{The Power On switch, is located inside the plastic Power On button assembly}

This is information about computer Power Supply's,

http://en.wikipedia.org/wiki/Computer_power_supply

This is a basic example of an SMPS, (Photo at upper right. You can click on the photo to enlarge), and info about.
(Switched-Mode Power Supply. The main type of power supply used in personal computers),

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

By bypassing the Power On switch, you will be able to determine if the problem is the switch, or Power Supply.

Bypassing the Power On switch turns the Power Supply on?
Bad Power On switch.

Bypassing the Power On switch does Not turn the Power Supply on?
Bad Power Supply.

A jumper wire is used on the 20, or 24-pin ATX main power cable.
The jumper wire goes to the Soft Power On, (PS_ON. Green in color), to ANY Ground wire.
(ALL Black wires are Ground wires)
A MOMENTARY contact is used.

(Example of a 24-pin ATX main power cable, and it's respective connector,

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

In order to guide you in this procedure, I need to know the computer manufacturer name, and Model Number.

On a desktop computer this will be located on the Back of the computer tower, (Next to the Windows product key), or up on the side of the tower.
Some models have it where there is a door you open in the front, and the product number, or model number is located there.

Post back in a Comment.

Aug 07, 2010 | HP Computers & Internet

1 Answer

Blinking green light front and back. Clicking sound from inside.


Do you mean the little green LED light near where you plug the power cable into the back of the computer? If that's the blinking light then unfortunately, this means that power is getting to the power supply but it is not going from the Power Supply to the Motherboard/Devices. The power supply is broken and is not converting the power from the wall to the proper voltage for the Motherboard/Devices. You will have to replace the power supply.

Call HP, and I hope you are in warranty and get it replaced for free or you can order the exact same one from HP that originally comes with that model. 1-800-HP-INVENT for their tech support line.

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No power


Sounds like its shot. I would suggest dropping in a larger (350-400W) power supply. Also consider a surge protector. A decent one should cost you $20-30. A $5 power bar is nothing more than a single on/off switch for multiple devices.

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Doesn't power up anymore


use a test pen and check if any power coming out from the power supply cable e.g. to hard drive, motherboard and so on.. this will help to to find out if it is actually power supply issue or components issue....

Aug 29, 2007 | RaidMax (ATX-612WBP) ATX Mid-Tower Case

1 Answer

Blinking power light


This set has a power supply and signal PCB. Since the indicator light is blinking, I would consider the problem to be a missing voltage from the power supply. Unplugging the set for a couple minutes may solve the problem. If not the set may still be under warranty. Contact LG (800) 243-0000 for a servicer in your area. Hope this helps.

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