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DELL monitor turns on ,stays on for 10 sec with good vga picture then turns off. Replaced 2 capacitors in power supplies -both were low (470 mf nominal) still the same problem...

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If you haven't already, on the bottom task bar, click on the ;power icon and see what your settings are

Posted on Feb 28, 2008

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My dell precision 470 beeps loud for 10 seconds when i turn it on and it has no signal to any monitor any ideas?


Please refer to the beep error codes for your work station here: http://support.dell.com/support/edocs/systems/ws670/en/ug_en/advtrbl.htm#wp1058075

Usually a 10 second beep is an issue with RAM not detected/installed or an issue with CPU

May 27, 2012 | Dell Precision 470 PC Desktop

1 Answer

When i turn on my computer the screen stays black as if it's off however, the computer is working fine. Sometime it flashes on but the goes back to black.


I suggest that your computer isn't working fine, it just appears to be.

But to know for certain you need to first diagnose whether the problem is the computer, or the monitor, or monitor cable.
Do you have another monitor and monitor cable available to use for a test?

If you have a VGA monitor, (Also known as CRT. Looks like a small TV), most likely the monitor cable does not disconnect.
For this test you would need another VGA monitor with cable.

If you have a flat screen LCD monitor, most of the time the monitor cable is changeable.
You can first use a Known to be good monitor cable, then if this doesn't work, use a Known to be good LCD monitor along with the good cable.

Still no progress?

Then the problem is the computer.
Bad Power Supply. Weak voltage power rail.
One of the leading causes of computer failure.

Also from the symptom stated it matches.

With a Power Supply that has a weak voltage power rail, (Or more than one), you will have enough power to light LED lights, and perhaps spin fans, but Not enough power to turn the Processor on.

1) ALL of the LED lights on at once use less than 1 Watt of power.

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

3) A typical Processor can use from 51 to 125 Watts of power.
Depends on what Processor it is.

This is why the computer may appear to be working fine, but in reality isn't.

Power Supply with a weak voltage power rail will run the Processor for a very short time, then not have the power to keep the Processor on.

How?
Power Supply's used in todays desktop computers are SMPS.
Switched-Mode Power Supply.

There are Electrolytic Capacitors used as Filters in the Power Supply.
They filter the incoming AC electricity, and the outgoing DC electricity to the computer components.

[ Electrolytic Capacitors are in the Input Stage, and Output Stage of a typical SMPS.

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

2) http://en.wikipedia.org/wiki/File:ATX_power_supply_interior-1000px_transparent.png

You can click on the photo to enlarge.
B shows Electrolytic Capacitors in the Input Stage of this typical SMPS. { Blue and 2 of them}
E shows more Electrolytic Capacitors used in the Output Stage ]

Electrolytic Capacitors can break down. They can operate in a weak stage as they are breaking down, for a small time period. Eventually they break down all the way, and fail.

This is how a Power Supply can work sometimes, then eventually one day it does not.

To explain Electrolytic capacitor break down, and failure:

Typical construction of an Electrolytic Capacitor;

Basic,
Three strips are rolled up tightly together, and inserted into a small aluminum 'can' case.
There is a rubber seal on the bottom of the case, and a seal on top of the case that can break open in the middle.

The three strips are;
1) A Conducting Strip
Thin metal foil usually made of aluminum. This is the Positive strip.

2) A Non-Conducting strip also made of thin metal foil, but has a non-conducting medium applied to it.

3) A paper-like strip that is soaked with Electrolytic Paste.

The Electrolytic paste soaked strip is put in the middle the Conducting strip, and the Non-Conducting strip, and all three strips are rolled up tightly.

At the bottom of the aluminum 'can' case is a synthetic rubber, flat disk shaped seal.
This is called the Bung.

There is a lead, ('Wire') going through the Bung to the Conducting strip. This is the Positive lead.
There is one more lead going through the Bing to the Non-Conducting strip. This is the Negative lead.

At the top of the 'can' case is a flat disk shaped, aluminum metal seal. This seal has an X, or Y shape etched part way into it.

As an Electrolytic Capacitor fails the Electrolytic Paste develops a gas.
Hydrogen gas.
The gas expands inside the aluminum 'can' case, and with enough pressure developed, the seal on top, and/or bottom are compromised.

The X or K shape that is etched partway into the metal disk on top, breaks open, and/or the synthetic rubber disk shape on bottom has one edge pushed out of the 'can' case.

This allows the gas to push Electrolytic Paste out of the 'can' case.
So much paste loss, and the capacitor operates in a weakened state.
Too much paste loss, and the capacitor fails.

Apologizes for the 'Windy' dissertation, but I thought it would be better to know what is going on, than receive a "Replace the Power Supply"

With No processor operating you essentially have No computer.
No computer operating = No Signal to the monitor.
(No video signal)


Need guidance in replacing the Power Supply, or suggestions for a Power Supply so you can compare, post in a Comment. (Believe upper right of your page)

Regards,
joecoolvette

Dec 01, 2010 | Computers & Internet

1 Answer

Just received Refurbished Advent CBE 1401. It is being replaced because power switch is faulty - but I have questions about machine. 1. When initially switched on the switch turned red is this normal? I...


1) No. The switch color should have been Green

2) No Signal on the monitor, indicates the monitor is not receiving a Video Signal from the computer.

A) Could be due to a faulty monitor cable.
Monitor cable is used on a working computer for a test,
Or,
working computer's monitor cable is used on the Advent for a test.

B) Could be due to the graphics 'engine' on the motherboard, or on the graphics card is bad.

[Graphics 'engine'.
GPU
Graphics Processing Unit.

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

If the computer is using Integrated Graphics, the GPU is on the motherboard.

(Integrated Graphics is also referred to as OnBoard Graphics. Meaning On the motherBoard)

You will know if it's Integrated Graphics, because the monitor cable will be plugged into the VGA connector, on the motherboard

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

Since you indicate an adapter was included, to adapt to a different port (Connector), it could be a VGA to DVI adapter, or a DVI to VGA adapter.

Your monitor may just have a VGA connector on the monitor cable.
Hence you would use a female VGA to Male DVI adapter.

Your monitor may be an LCD flat screen monitor, and has a DVI connector on the monitor cable.
Hence you would use a female DVI to Male VGA adapter.

DVI
Digital Visual Interface

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

VGA monitors are Analog.
LCD monitors are Digital.

A computer puts out a digital signal.

If a VGA monitor is used, the computer has to alter the Digital signal to an Analog one.
This slows down the video signal.

If your monitor (In any case. Not just this one), is an LCD flat screen monitor, it is best to use a DVI monitor cable, and plug into a DVI port on the computer, if available.

If your monitor is a VGA (CRT. Cathode Ray Tube), monitor, and you have a DVI connection on your computer, using the adapter will do you no good.

The adapter just uses the contact pins for VGA, that are present in that DVI adapter, and hence the DVI connection on the computer.

You're still just getting an Analog VGA signal.

Example of a female VGA to male DVI adapter,

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

If the Integrated Graphics are suspected to be bad, a graphics card is used in the appropriate expansion slot, for a test.

If the graphics work then, the graphics card is left in service.

After I test the monitor cable my next procedure is to suspect the Power On switch, or the Power Supply, and go to the graphics next.

The reasoning is that Power Supply failure, is the number one cause of computer failure.
The next is the Power On switch, then Electrolytic Capacitors used on the motherboard.

(Specifically, any Electrolytic Capacitors used in the motherboard Voltage Regulator Circuit)

If the Power On switch is bypassed, the diagnosis will reveal if the problem is the switch, or Power Supply.

Bypass the Power On switch, and the Power Supply comes on?
Problem is the Power On switch.

[One Power On switch I have found to fit a lot of computers. The Power On switch goes into the plastic Power On button,

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

Bypass the Power On switch, and the Power Supply does Not come on?
The problem is the Power Supply.

The Power On switch is bypassed using a jumper wire, from the green Soft Power On wire, to ANY black Ground wire. The contact made is a brief momentary one.

The jumper wire is used at the back, of the 20, or 24-pin ATX main power cable connector.

To be continued in an additional Comment.


Jun 04, 2010 | Computers & Internet

2 Answers

When I turn boot up my gt5220 the monitor briefly flashes and then goes into power saving mode- desktop stays on, fans running and all, until turned off by holding power button down or unplugging it.... my...


first try to connect another power source if it does work that is good then try the other options 1- rams 2- vga card 3- cpu 4- of course there is always the motherboard option....
i had the same problem several times mostly it is the power supply ( the power source ) sometimes gives a weak voltage or amps....

Dec 02, 2009 | Gateway GT5220 PC Desktop

1 Answer

Black screen on monitor


Hi,
this will be the onboard VGA adaptor ( driver Missing Corrupt ) there are a couple of things to Try.
1:- remove power from Computer, Locate the Cmos battery ( small round battery that stores Bios Info ) remove battery for 10 seconds. replace. power up and boot.

2:- If your computer has an onboard graphics card Slot. AGP/Pci-express. add an additional card, and attempt to run on that card. to boot the computer, enabling you to re-install the corrupt/missing vga driver.

thankyou for using fixya.

Mike @ Compurepair.

Jul 20, 2009 | Computers & Internet

2 Answers

Dell Optiplex GX270 will not start and power button is orange


I think that it is most likely that this is a power supply going bad. These can be purchased cheaply on eBay (make sure the picture matches). This replacement is moderately technical.

The other good possibility is a bad capacitor(s) on the motherboard. This is very common for the GX270s due to a manufacturer defect. Most of them failed in years 2-4, though. This would require a replacement motherboard (very technical). Pictures of bad capacitors: http://brianmorristech.com/?p=105

It could also be related to the power connector from the power supply to the motherboard (unlikely).

Another good option would be to buy a used GX270 from eBay and put your hard drive into it.


Jul 13, 2009 | Dell OptiPlex GX270 PC Desktop

3 Answers

Power light not turning green just amber.not a power flactuation problem


There are a few things you will have to do. First, remove any newly installed card in the PCI socket if any. Try to re-sit the memory chip modules, that's removing and re-installing them. If they are two, try replacing one after another. Thirdly, try another VGA card incase you using the onboard one. Finally, swap your monitor. It must work. Good luck

May 26, 2009 | Dell OptiPlex GX260 PC Desktop

2 Answers

Samsung 940BX LCD monitor 9 mos. old, Problem with monitor not staying on. You turn it on, it will come on for about 3 secs w/picture then goes off, but blue light stays on, black screen. Press power...


The IPboard part no. BN44-0012A is bad. We had to replace 5 monitors with the same problem. If under warranty call 1-800-Samsung for repair or exchange.

Korhan Balimtas

May 19, 2008 | Computers & Internet

7 Answers

Dell GX150 - Power light flashing orange


A blinking Yellow power light means a dead power supply. Whats with all the overly complicated answers. Every Dell I've ever worked on that had that problem was the power supply and I've fixed hundreds of them.....

Nov 28, 2007 | Dell OptiPlex GX150 SF PC Desktop

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