Question about Computers & Internet

Open Question

12 volt power supply putting out 20 volts - Computers & Internet

Posted by on

  • brutis5 Apr 24, 2009

    thankyou for your responce , it's , the ic was burnt and cracked for the hot to the other side , i replaced that , and then someone said to check all the caps and resisters so, i dont' now how to check them ( yet ) but i know how to replace them so i have been replacing them one at a time so far i have replaced 2 caps and 2 resisters and the ( tip 31 ) there is only 2 more of each to go ,

    and the volts have droped a little down from 21.5 to 19.25

    when i put it under load it dose drop to about 15 volts



    thanks bob

  • Thomas F. Schneider May 11, 2010

    Replace the poswer suplly as the windings are shorted inturnally and not transforming down to the 12 volts  anylonger. 

×

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 214 Answers

SOURCE: pyramid ps-15kx

Unplug the PS-15KX 120V AC cord !! Then take cover off. DO NOT plug the AC cord in unless you are used to working around a lethal voltage and current !!!!!!!!!!

If you can use a Multimeter, then measure resistance across each pair of the 3 leads of the output transistors. You will probably find fractions of an ohm across a pair of leads. One or both may be shorted. NOTE: Do not ever measure resistance in a powered up circuit, kiss meter bye-bye and maybe burn you too.

By putting more robust transistors in this supply, you may not gain much reliability. The supply is rated at a continuous current draw, which is less than the intermittent current they advertise. Read the spec's of any power supply you get and look for continuous current ability.

There are several better transistors that will substitute for the 2N3055. You will need to look at a transistor substitution book and check specs. The internet is great for this. I used to use all kinds of data books, and still have them! But looking up info on-line is nice. Motorola has some that will fit and have higher current and voltage ratings,

Get someone who is a ham or geek if you aren't sure about sticking your fingers in the power supply.

Be Careful, Work Safe, it is a factor of longer life.

Posted on Nov 14, 2008

SDZAKKMF
  • 50 Answers

SOURCE: No Power of a Compaq Presario Computer

Make sure that the power button is conected to the right prongs on the mother board. On the writing next to the prongs it should say power.

Posted on Feb 24, 2008

  • 435 Answers

SOURCE: power supplies

Hi,
I assume you want to turn on your son's device with this ATX PSU.

here is the 20 pin configuration.
which gives you an idea of which pins could be used.


http://img510.imageshack.us/img510/6133/20pin24pinconnectoroe2.jpg

:)

Posted on Oct 08, 2008

Clockwire
  • 72 Answers

SOURCE: Compaq dead after power company shutdown period

Sounds like a blown fuse in the psu, replace the unit and you should be good to go.

Posted on Dec 02, 2008

  • 1602 Answers

SOURCE: Pinouts for DPS 1200 eb a /24 pin

CALL A LOCAL COMPUTER CABLING SPECAILIST AND SEE IF THEY CAN HELP YOU WITH THE PIN OUT

NEED MORE HELP CONTACT ME

CANDYMANGANDY

Posted on Jan 29, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do I hardwire this unit for an in home use installation?


You would need to have a stable 12 volt DC power supply that plugs into a 120 VAC outlet. You can google these, and they come in quite a few varieties. The most expensive are the variable voltage "lab grade" ones, then the bench grade fixed voltage variety, and then the cheap consumer grade 12 volt 1 or 2 amp device designed for CB's and small 12 volt devices. But this will not work, because you are transmitting and could be putting out 40 or 50 watts with that thing. So you will need a good 10 amp to 20 amp dedicated transceiver power supply, unless you just plan on receiving in which case you only need a couple of amps and the cheapie will do. It's always better to have more amperage in a power supply. You then need to think about issues like back-up power with a gel cell 12 volt battery, which also would allow you to use the cheapie supply, because you would have plenty of current to XMIT from the battery. Schematic shows a very basic 12v - 30 amp supply. Good luck!

26008678-fsjrla4npt4n1a5imgka1wq5-2-0.png

Dec 15, 2015 | Kenwood Used Tk-880 Uhf Fm Transceiver...

1 Answer

Power drains


Probably due to the power supply is limited in it's power output. I'll bet it's not much higher than a 10 amp rating at 12 volts, the amp is designed to work with 14,4 volts and will draw at least 20 amps meaning it will take 300 watts of power to run that amp. If you limit the current to 10 amps that means it will need 30 volts to make up for the amperage that isn't there. Since your power supply cannot do that it just puts out what it can and ends up at the bare minimum before your amp will just shut off.

Mar 31, 2013 | Jensen JXP340 Car Audio Amplifier

1 Answer

Hou you can make a stand alone 12 volt suply


Take two 6 volt batteries and put them in series to one another, and/or eight 1.5 Volt cells in series.

Mar 24, 2013 | Dell DPS-312AB Power Supply Server Power...

1 Answer

Smps not working


http://www.itwinkle.com/hp57posub.html

Nothing special about that Power Supply except for the PRICE!

It's just a regular ATX SMPS with a 575 Watt maximum rate wattage, and an 8-pin EPS +12 Volt power cable.

The HP part number is HP 405349-001
I just THOUGHT the above model was expensive,

http://www.sears.com/hp-405349-001-hp-575watt-power-supply-for-workstation/p-SP101A9790S5492818201P

Uses one 24-pin ATX main power cable,

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

One 8-pin EPS +12 Volt power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#eps8

[NOTE*
NOT to be confused with the 8-pin PCI Express power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress8

Yellow wires are 12 Volt wires. Black wires are Ground (Negative) wires.
The 8-pin EPS +12 Volt power cable has FOUR 12 Volt wires.
The 8-pin PCI Express power cable has THREE 12 Volt wires ]

I believe 4 SATA power cables,

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

,and a few 4-pin Peripheral power cables, ('Molex'),

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

Power Supply case dimensions are approximately
6 Inches Wide, 5.5 Inches Long, and 3.5 Inches in Height.
(152.40mm Wide, 139.70 Long, and 88.89mm in Height )

36 Amps combined for the two 12 Volt power rails.
(12V1 = 18 Amps, 12V2 = 18 Amps)

This is an example of a replacement SMPS,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=899124&CatId=1483

I'm running one of these right now in a Dell Optiplex 745
Yes, even though the power cabling noted on the Tigerdirect ad is erroneous, it DOES have an 8-pin EPS +12 Volt power cable.

One 24-pin ATX main power cable
Four 4-pin Peripheral power cables
Six SATA power cables
One Small 4-pin Peripheral power cable. (Used for a Floppy Drive, or a Card Reader)

Two 12 Volt power rails. 12V1 = 23 Amps, 12V2 = 20 Amps
Combined = 43 Amps on the 12 Volt power rail.

Repair?
Due to the possible electrocution hazard, I don't post info on repair.
I will state;
The capacitors need to be PROPERLY discharged, before attempting to work on the unit.
The Radial Aluminum Electrolytic Capacitors are the weakest link.


For additional questions please post in a Comment.

Regards,
joecoolvette

Feb 17, 2013 | HP Computers & Internet

1 Answer

Cobra 148 gtl cb no recive, the power supply put 20+volts inti it, what could be the problom.


Your power supply is providing 20 volts? THAT is the problem. This radio should be connected to a power supply capable of providing anywhere between 12 ~ 13.8 VDC. Twenty volts is WAY too much. You may have cause significant damage to the radio if it was connected to that voltage for any period of time.

Jan 12, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Ref ASTEC power supply from old computer model SA 147-3505 I can pick up the logic 5 volts but not the +12 volts and -12 volts .FAN not energised so I guess there needs to be an elec link via the computer...


You can jumper on an ATX power supply by using a wire to connect pin 4 (green wire) to any of the grounds on the 20 pin ATX connector. The grounds are normally a black wire. You will need to put some sort of load on the power supply such as a hard drive to keep it running.

Feb 25, 2011 | Dell PWR,SUPPLY,145 WATTS,ASTEC SA150-3411...

1 Answer

I am trying to troubleshoot whether or not my ultra x2 connect 550 watt power supply is bad. When you press the power button on the computer, the light flashes and then noth9ing else happens. The light...


Well here is a way to check your power supply, on your hard drive connector using your volt meter and measuring from ground. this would be using one of two middle connectors it should measure +5 VDC on the red wire and + 12 VDC on the yellow wire. If these voltages are good then we got to see if the power supply is producing the -12VDC voltage. This voltage is ussed by the syustemboard on pin 14 of a 24 pin power supply. I would recommend not having your system board plugged in while measuring these votlages, but the power supply may need a load, I would plug in the cdrom.. Below are a couple of picture to explain this and a link to a website that has this documented.

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

dfish26_1.jpg The 24 pin main power connector was added in ATX12V 2.0 to provide extra power needed by PCI Express slots. The older 20 pin main power cable only has one 12 volt line. The new 24 pin connector added one line apiece for ground, 3.3, 5, and 12 volts. The extra pins made the auxiliary power cable unnecessary so most ATX12V 2.x power supplies don't have them. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction.
Pinout Pins 1 through 12 Pins 13 through 24 Description Wire color Pin number Pin number Wire color Description +3.3 volts orange 1 13 orange +3.3 volts +3.3 volts orange 2 14 blue -12 volts ground black 3 15 black ground +5 volts red 4 16 green PS_ON# ground black 5 17 black ground +5 volts red 6 18 black ground ground black 7 19 black ground PWR_OK gray 8 20 white -5 volts (optional) VSB +5 volts purple 9 21 red +5 volts +12 volts yellow 10 22 red +5 volts +12 volts yellow 11 23 red +5 volts +3.3 volts orange 12 24 black ground
Good Luck I hope this helps.

Nov 19, 2010 | PSA Ultra X2 Connect (ULT31851) 550-Watt...

1 Answer

20-Volt DC Power Supply instead of 12-Volt amp


Here's a few things that come to mind. An auto charging system will operate normally from about 11 Volts to about 14.5 Volts, depending on what is operating (lights, blower,etc), and whether the vehicle is at idle or not. Most car amps will operate from about 10.5 to 16.5 Volts, and outside that range, they will probably shut down.
Another consideration is your 20 volt power supply. You didn't mention if it is a DC power supply, but it needs to be. The other factor is its output, meaning its amperage rating. I'm figuring it will need to put about 5 amps, at the least, for the Sony to put out some watts. I think the line fuses of the Sony are rated @ 25 amps each.
I don't like this type of situation, because I want to say 'try it and see what happens" and I want to say 'don't do it, something may blow".
If you decide to try the 20Volt power supply, maybe if you put smaller rated fuses (say 10 amp) in the Sony amp, they will act as a fail safe. Good luck!

Jul 26, 2009 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

Where to plug case side fan


Pinout Pin number Wire color Description 1 yellow +12 volts 2 black ground 3 black ground 4 red +5 volts

Jan 27, 2009 | Okia / 450-Watt / ATX / 80mm Fan /...

1 Answer

Ps 52 kx power supply will not hold load


thank you for your help . I have already fixed the power supply I double checked the transisters and found three bad so I replaced all the power transisters and it is fine . thanks again bob

Nov 17, 2008 | Pyramid - PS21KX 20 Amp Power Supply Car...

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

139 people viewed this question

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...