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Constant 12 volt power on up side of window regulator from computer

On the up side of the window regulator i have a constant 12 volt power supply coming directly from what i believe is the bcm under the drivers side dash, even with the window switch disconected i still have the 12 volt constant on the up side of the motor, i chased the wire back to look for a short to power but was unsucsesfull the wire goes directly into the computer what could this be if ne thing besides the computer

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So post you problem in the correct section, this is Laptop section.

Posted on Feb 22, 2012


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How I connect my jvc to keep memory

The yellow wire goes to a 12 volt constant power supply. The red goes to a switched 12 volt power supply. The black goes to chassis ground.


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Intel d865gbf motherboard giving three peeps without ram but with ram no display

What display are you getting with Ram Memory installed? The BIOS Setup Utility?

Start with cleaning the Ram Memory module's, gold plated contact pins, with a pencil eraser. Reinstall, try again.

{ Power UNPLUGGED, Anti-Static Precautions followed. Don't follow Anti-Static Precautions, and you may as well remove the motherboard, and fly it at the cat }

If using an eraser on the end of a pencil, and not a solid eraser, refrain from letting the metal band of the pencil touch the contact pins.

The bottom of the ram memory module is where the contact pins are.
Start at the top of EACH contact pin, and stroke down.
Clean EACH contact pin. (There are 184 contact pins. 92 on each side. Doesn't take long to clean)

After cleaning with the eraser, it may seem as though you have done nothing at all. You have.
It doesn't take much 'corrosion', on a contact pin for a bad contact surface.

When satisfied the contact pins are clean, use air to remove the eraser dust, then reinstall the ram memory module/s.

However, when diagnosing a problem with a desktop computer, there are two components to check right off the bat.

1) Power Supply
2) Motherboard

Almost 80 percent of desktop computer failure, can be attributed to a bad Power Supply. Weak Voltage power rail.
(Next in line is the computer is dirty inside)

LED lights may light, and fans may spin, however there isn't enough power to turn the Processor on.

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 from 51 to 125 Watts of power.
Depends on what Processor it is.

Intel Pentium 4 processor that uses a Socket 478 processor socket, and has a Front Side Bus of either 400MegaHertz, or 533MHz?

Look under TDP in the charts.
(Thermal Design Point, or also stated as Thermal Design Power. Essentially the maximum power stated in Wattage, that the Processor may use)

Power Supply;
There are three main voltages produced by the SMPS in your computer.
(Your Power Supply is a Switched-Mode Power Supply, )

A) The 3.3 Volt power rail
B) The 5 Volt power rail
C) The 12 Volt power rail

Power Rail:
Each voltage listed above starts in it's own central point, in the Power Supply. All of the wires carrying the voltages come from this point.

For example; Orange wires are 3.3 Volts. All Orange wires, end in one central 3.3 Volt point, in the Power Supply. This is the 3.3 Volt power rail.

Red wires are 5 Volts. They end at one central 5 Volt point in the Power Supply. The 5 Volt power rail.
Same for the Yellow 12 Volt wires.

To test the 5 Volt power rail for example, you choose any Red wire you see. (ALL Black wires are Ground wires)

Use an economical multimeter set to DC Voltage. (Symbol is dotted line over a solid line)
An economical multimeter can be purchased for around $5 to $12.
Available in a multitude of stores. An auto parts store is but one example.
{Need guidance in how to use post in a Comment}

OR, use a KNOWN to be good, Compatible power supply, for a test unit.
(Compatible being has the minimum amount of Wattage, at least, and the correct amount of power cables, and correct power cables)

The weakest link of a motherboard is the Electrolytic Capacitors.
(Which the Intel D845GBF motherboard uses, and not solid Polymer Capacitors)

These capacitors are used as Filters, and Voltage Regulators, on the motherboard.

The one's used as voltage regulators, are in the Motherboard Voltage Regulator Circuit,

Part of what the motherboard voltage regulator circuit does, is to regulate voltage for the Processor.
The Processor MUST have a steady, clean supply of voltage, AND it must be within a very tight tolerance range.

See if you have bad 'caps',

For additional questions, and/or to clarify anything I have stated above, please post in a Comment.


Dec 31, 2011 | Intel D865GBF Motherboard

1 Answer

I need a replaqcement trqansformer for my Starlogic monitor model # HD20W) the transformer is 120V -!2v 5A. Thanks for youyu help.

If the transformer puts out a simple 12 Volts regulated at 5 Amps, you should be able to go to any electronics parts distributor and order a regulated power supply at the mentioned specs. There are models that come enclosed with terminals on them. You can also buy the supply raw, wire the AC cord to it, get an enclosure for it, and wire the the 12 Volt output side to the TV as necessary.

If you are not experienced at doing this type of work, find an electronics type person to do this for you. If you confuse the polarity to the TV set, or not select the proper power supply, you can damage the TV set.

These power supplies are not very expensive. A new low cost one can cost about $60 to $80 US depending on the model type and rating. Professional high quality type supplies can cost a lot more.

Sometimes these supplies can be found slightly cheaper from electronics parts surplus dealers. I have seen them sold surplus for under $20.

Jerry G.

Oct 15, 2011 | Star Logic 17" LCD Monitor

1 Answer

The lcd black after 2 second and when open his back side then he woriking some time and then we turn off it and again on then same proble with that soory for not good english

the problem will be in power supply.

check the 5 volt regulator or 12 volt regulator IC

After geting heatup the IC may malfunction.

Change the regulator IC

Sep 14, 2011 | LG W1934S-BN 19" Monitor

1 Answer

I have an emachine t2885, when i hit the power button, i dont get any power to the computer, but the keyboard, speakers and monitor lights go on, but no power to the computer, help

I'm going to guess pwr supply 12 volts side. The 5 volts side lights up keyboard and mouse; both get replaced when they fix (replace) the power supply.

The hard drive and dvd player us the 12volts side.

Check 12 volt supply side if low disconnect hard drive check voltage again,, if 12 volts hard drive bad,,, if low disconnect dvd,,, if 12volts connect hard drive,,,if 12 volts dvd bad. of course this scenerio can go the opposite way. Do you know how to use a multimeter? Black box maintence is exciting.

Nov 27, 2010 | E-Machines eMachines Desktop PC

1 Answer

My suddenly shutdown then i power on machine must be restart and restart tell me wat the solution

Three main things can cause this.

1) Inside of computer is dirty, as well as the inside of the Power Supply.

Dirt, dust, etc, can cause the cooling components capacity to drop tremendously.
If the Processor overheats, it is turned off. (BIOS turns it off)

This is a Fail Safe feature that is built-in, to keep the Processor from burning up. (Literally)

A non- working Processor fan, or one that works intermittently, or doesn't spin as fast as it's supposed to, will also cause the Processor to overheat.

The major cause of computer failure, is that the computer, (And Power Supply) is dirty inside.

Solution is to have the computer unplugged from power, computer case open, use a can of compressed air for computers, and clean the inside of the computer, PLUS the inside of the Power Supply.

(Read about Anti-Static precautions below, BEFORE you do)

2) Power Supply is bad. Weak voltage power rail, brought about by failing components inside the Power Supply.

Test the Power Supply for voltages.
Computer power supply's, supply three main voltages.
A) 3.3 Volts
B) 5 Volts
C) 12 Volts

[Orange insulated wires are 3.3 Volt.
Red wires are 5 Volt.
Yellow wires are 12 Volt.
ANY Black wire is a Ground wire]

This test can be done with an inexpensive multimeter, or a Power Supply Tester.

The Positive (Red) probe lead of the multimeter, is connected to the power wire to be tested.
The Negative (Black) probe lead is touched to any Ground wire.

The 12 Volt power can be 11 to 13 Volts. Below 11 Volts it's time to replace the Power Supply.

This is one example of an inexpensive, easy to use Power Supply Tester,

Or, a compatible, KNOWN to be good power supply, can be substituted, and used for a test unit.

3) Electrolytic Capacitors are failing on the motherboard.
Specifically, the ones used in the motherboard Voltage Regulator Circuit.

One of the jobs the Voltage Regulator Circuit does, is to regulate voltage for the Processor.
A Processor must have a Steady, Clean, supply of voltage, and the voltage MUST be kept within a certain range.

This range, or Tolerance Zone, is VERY small.
Too little voltage the Processor turns off.
(No Processor operating, No computer)

Look for obvious signs of capacitor, (Electrolytic Capacitor) failure.

(Takes a couple of seconds before the page fully loads)

This is what happens when Electrolytic Capacitors are failing, in the motherboard Voltage Regulator Circuit,

(Starts at 0:04)

Solution is to replace failing, or failed Electrolytic Capacitors, or replace the motherboard.

To summarize:

1) Check to see if the computer is dirty. If so, unplug from power, open the computer case, use a can, or two of compressed air for computers.

2) Visually inspect for bad capacitors.
(BEFORE reaching inside a computer, have the computer unplugged from power. Observe Anti-Static precautions.

Your body carries Static electricity.
Static WILL fry out {Short Circuit} the hardware components inside a computer.

Work on a table. Computer Unplugged from power. Computer case open, TOUCH the metal frame to relieve your body of Static.

SHOULD you get up, walk away, then return, TOUCH the metal frame again)

3) Test the voltages of the power supply, or use a KNOWN to be good, compatible power supply for a test.

The Power Supply may light lights, and spin fans. It may even sound as though the Harddrive is running.
However if the Power Supply has a weak voltage power rail, there won't be enough power to turn the Processor on.

A) All the lights use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts.

C) A typical Processor can use anywhere from 51 to 125 Watts. Depends on what Processor it is.

No Processor operating, the Harddrive just sits there, and spins the Platters inside.

There is no Processor to find the boot sector located on the Harddrive.
That's why it sounds like the Harddrive is operating, but in reality it isn't.

Read this to know how a Harddrive is made up, and about the Platters I referenced to above,

May 21, 2010 | Computers & Internet

1 Answer

1990 buick century All power windows will not move fuses on fuse block (locaated in back of glove box door )checked ok with ohm meter T.I.A. ****

Well I was wrong, the window on pass side worked from the switch on the pass door !! So now that I know this I took apart the driver side door switch controll panel ( ie. 4 windows switch up/down & 4 door lock / unlock switch) I found 12 volts to the door lock section but NO 12 volts to the window section ( with key on) !! ratheer then trying to trace out this wire (oange) I took 12 volts from the door & jumpered it to the window 12 volt supply { now I know the door wire is thicker ( more amps) then the window supply but I dont't think I'll be useing all 4 window moters at once...} oh well what the hell it's almost 20 years old has three sets of seats & gets close to 28 MPG....

Oct 16, 2009 | Buick Century Cars & Trucks

2 Answers

Toshiba MD20FP3 not turning on

Is a good thing the main fuse is not open,your problem is in the power supply ,as I understand you have no indication of power(no lights,No clicks)The 5 volts that power the microprocessor might be missing,this 5 volts usually come from a regulator,this regulator should have 12 volts in one side and the 5 volts in the other,the 12 volts come from the secondary of a transformer and it has its own fusible resistor,if the resistor is open is because the regulator is shorted and it need to be replaced.This is a good place to check.Be careful when checking this parts.If you are not too familiar with tv service seek the assistance of a servicer,it should not be too expensive.

Oct 03, 2006 | Toshiba MD20FP3 Combo

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