Question about Compaq Presario 700 470024-192 Notebook

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My compaq 610c EVO will not power up. I applied reverse voltage of 12 volts to it by mistake (wrong power supply) now it will not start up on a good supply. Battery system appears to not work. I have no schematics, willing to shotgun. Can you provide location of failure points ( ie fuse, regulators, rectifiers. I can read 18v on the bottom desktop expansion connector. Any help woud be apprciated.

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  • hydroquest Dec 31, 2007

    I have the correct power supply connected now, it will not start up. I would like to fix the motherboard instead of replacing it. I am looking for the location and id number for the primary componets likely to fail with reverse polarity applied. I don't have schematics, have checked the fuses I could find. Battery charge light does not come on. No smoke, wrong power supply rated at 12V 1/2 amp. Suspect dammage is minor, just need to check related components. Most of the motherboard has no voltage on it but did find a connector on the bottom of the board that has the full 18V on it. Battery charger has about 4.4V on each pin without the battery. Looking for PS and Battery charger Schematics or probable failure component numbers and locations.



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You shouldn't have damaged it, because it was fewer volts than what it needed, correct?

Posted on Jun 25, 2008

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The ac adapter is not 12 v that is 18 volts so you can try to start geting the right ac adapter an that does not have fuse what it has is diodes and resistors and transistors looks like you know a lot of electronics components so you have to get the adapter and conect it if does not work check the first module that has the conection for the ac adapter good lock

Posted on Dec 30, 2007

  • Jose Ramirez Jan 01, 2008

    ok if you wants to fix that start for checking all the diodes from the power conection because when you apply the invert polarity the firsr part to be checked is diodes


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You may have damage the main mother board. replacing the fuse,or regulators will not help.better to replaced the main mother board.and stay use the same hd and cd.but you may have to reload if you are not replacing with the same exact board. good lock

Posted on Dec 30, 2007

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My computer turns off automatically with light on keyboard and motherboard

HP Compaq dx2300 Desktop PC?

90 percent of desktop computer failure, cab be attributed to;

A) The computer is dirty inside, to include the Power Supply.

B) The Power Supply is bad

Suggest you start with cleaning the inside of the computer out, but suspect the real problem is the Power Supply.


Because the CD-ROM is not working.


Your Power Supply converts your household/business AC electricity, into 3 low main DC Voltages.

Depending on your country;
USA = 120 Volts AC
Europe = 220 Volts AC
Australia = 220 Volts AC
Japan = 100 Volts AC

This is converted into 3 low DC Voltages for the computer;

A) 3.3 Volts (DC)
B) 5 Volts (DC)
C) 12 Volts DC

Each of the above is a voltage power rail.
The amperage for each power rail is stated on a label, on the Power Supply.

Voltage times Amperage = Wattage

Again, Voltage x Amperage = Wattage

All of the amperage of the voltage power rails are combined, (Added together), to equal the maximum Wattage, the Power Supply will deliver.
This should be stated on the Power Supply label also.

A) IF, all of the LED lights were on at once, they would use less than 1 Watt of power.

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

C) A typical Processor can use 51 to 125 Watts of power.

[ Intel Pentium Dual Core E2160? Can use up to 65 Watts, ]

You press the Power On button. This in turn presses against a Power On switch,

This in turn, activates the Soft Power On feature of the Power Supply, and turns it on.

The first chipset to receive power is the BIOS chipset.

The BIOS program looks to see what devices are connected, does a Ram Memory count, turns the Processor on, then hands the computer over to the Operating System.

[ Windows XP and Windows 7, are two examples of an O/S ]

Primer over.

Your Power Supply provides enough power to turn the Processor on, then falls to it's knees. Doesn't have enough power to keep the Processor on.

[ A typical CD/DVD drive requires 15 Watts of power. It isn't there when all of the other hardware needs power first ]

Suggest you find a Power Supply that is KNOWN to be good, and COMPATIBLE, for a test unit.

Or you can test the 3 main voltage's coming out of the Power Supply, with a Multimeter set to DC Voltage.

Or you can just replace the Power Supply.

I would prefer you test with another unit, or test the voltages, before you spend your hard earned money.
It's up to you.

Diagnose the problem first. I could be wrong with the above, but if you diagnose using a test unit, or test the voltages, we will know whether the Power Supply is the problem.

Always start with the power First.

Perhaps there is an unused computer you may have access to, and can borrow it's Power Supply for a test unit. Has to be KNOWN to be good, and has to be COMPATIBLE.

What is Compatible? Means it has to have at least the minimum power cables, and the Power Supply must fit in the computer case.

(It is an ATX power supply)

Need recommendations for a Power Supply, post in a Comment.
Also will step by step guide you in replacing.


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1 Answer

If the red light on Compaq Evo D510 P4 keeps on blinking and the PC wont start when you try to power your PC then whats the problem ?

Power Supply.

Weak voltage power rail, or more than one.

(There are three power rails for the Power Supply used in your computer;
1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail.

Wires with Orange insulation carry 3.3 Volts
With Red insulation carry 5 Volts
With Yellow insulation carry 12 Volts.

Each wire is connected to one power rail in the Power Supply.
{All Black wires are Ground wires}

The Power Supply in your computer is an SMPS. Switched-Mode Power Supply, )

I don't know what form factor your Power Supply is because you didn't state which model it is.
Small Form Factor (SFF)
Convertible Mini-Tower
Ultra Slim Desktop

Post additional questions in a Comment. Also state what model your Compaq Evo D510 is.


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Daewoo TV Dead

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WARNING: This applies only to a modern, flat TV. If it's a older CRT type, they have up to 50,000 volts in them and will KILL YOU.

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voltage and current can be found on ur battery
watts=volts +amps

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Hi SusanneRenee,

The compaq would be a standalone. Just connect the keyboard, mouse, speakers, etc. and your good to go.

Hope this helps and good luck.

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A half volt will not make any difference. Sounds like the power supply is malfunctioning. Start by trying a different one. Keep in mind that you may have fried the new motherboard by using a faulty power supply. Popping sounds indicate a short or loose/exposed wires, and are never good with any electrical device, especially a laptop since they are sensitive to power fluctuations to begin with.

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check first your power supply or source if no output voltage..if no voltage it is damaged try a new power supply...
second if the power supply is good the problem is in your player maybe thier is a damage or burn capacitor or transistor to be replace

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1 Answer


quite a difficult situation, methinks...

Feb 21, 2008 | HP Compaq Evo n610c Notebook

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