Converting desktop psu for laptop

Discussion in 'Computing and Networks' started by MABDALLA, Feb 13, 2014.

  1. MABDALLA

    Thread Starter New Member

    Jan 21, 2014
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    i have an atx desktop power supply...i was wondering..i have the correct tip for the laptop im trying power...the laptop usually uses a 19v 3amp charger... but no where on laptop motherboard is the whole 19v needed....theres pwm voltage regualtors on board that distribute 5v, 3v, 1v across board but never is the whole 19v needed...most i think needed probably 10v....since there is a 12v line on desktop atx powersupply...i was thinkng it would be enough.. to power up laptop


    not sure anyone with experience with this
     
  2. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Why go through all of that hassle and have an ugly, noisy PSU hanging off of your laptop with a jury rigged wiring arrangement when you can get a laptop power supply on eBay for $10-$15???
     
  3. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    I am missing the question.
     
  4. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Hard to tell when there are all of those periods, no capital letters no question marks.
    Somewhere in all of that mess the OP wants to use a desktop supply to power a laptop. Or at least I think.
     
    Last edited: Feb 13, 2014
  5. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    Why waste all the time effort and when it can be had for so cheaply? ??
     
  6. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    I agree, but I learned an interesting word a few years ago: ass-u-me.

    The proper usage: assume is making an ass of you and me.
     
  7. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    Why waste all the time effort and when it can be had for so cheaply? ??
    Where are you from or live now? ?
     
  8. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    They probably been watching The Red Green Show.
     
  9. MABDALLA

    Thread Starter New Member

    Jan 21, 2014
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    Sorry for all the misunderstandings….
    I type fast and think even faster so theres mistakes and typos. Also english is my thrid language. I dropped out of college as well so lets just say I'm not an english major.

    What I should have told you is I repair alot of laptop motherboards (no power) as a hobby and sometimes I dont have the power adapter for the specific model( i purchase these on ebay as dead boards than fix them ). I can go and buy a universal adapter but they run to be atleast 100$ for a good quality one.

    I have so many atx power supplys laying around and I have seen so many tutorials on making a bench power supply. I also thought of buying a bench power supply as well but they too run to be atleast 100$ for a decent quality one.

    My question.

    Can a ATX desktop power supply be made into a bench power supply that powers any laptop motherboard>?
     
  10. takao21203

    Distinguished Member

    Apr 28, 2012
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    Yes with a voltage booster. You know how to fix a laptop mainboard, but you don't know a voltage booster module.

    There are cheap one's for less than 10 dollar, and decent quality ones which are more expensive.

    amost all laptops use 20V but unfortunately plugs are all different. I hate the Dell plugs- they are specifically designed for breaking. The pins are very thin, and the plastic is very brittle.
     
  11. MABDALLA

    Thread Starter New Member

    Jan 21, 2014
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    Its pretty simple to look at a schematic and see where the electricity is flowing than take measurements and find out where the problem is…theory aspect of it I'm still learning as far as the circuit goes

    I'm fairly new to electrical engineering I've been a student for only 6 months prior to that I dealt with aviation and software aspect of computing. So excuse me if I havent looked into a "voltage booster module"

    thanks for your help..Ill figure it out :)
     
  12. Metalmann

    Active Member

    Dec 8, 2012
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    "Can a ATX desktop power supply be made into a bench power supply that powers any laptop motherboard>?"




    I don't see why you couldn't.
    Just buy several adapter jacks for the different models.
     
  13. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Nothing at all with your English on this post. I would think it is your first language.

    I don't think you are going to have the right voltages for the laptop. Most of them require 15V if I remember correctly. You might be best to still buy one of those eBay laptop supplies and add any needed connectors for various laptops.
     
  14. takao21203

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    Apr 28, 2012
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    there are cheap voltage boosters on eBay but for about the same price you can get a replacement adapter
     
  15. MABDALLA

    Thread Starter New Member

    Jan 21, 2014
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    Yea I was thinking of just doing that..I have all the various tips just need a good bench power supply…the atx is great for power my smaller electronic hobbys but laptops I've had no luck in trying figure out a easy way which will be less costly..voltage boosters modules im looking at say max input current is about 5amps…my atx current is almost more than double that
     
  16. spinnaker

    AAC Fanatic!

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    There are lots od supplies out there for under $100 US

    This one looks like it might be a Mastek
    http://www.circuitspecialists.com/csi3003sm.html

    I bought this one from them

    http://www.circuitspecialists.com/bench-power-supply-csi3303s.html

    It is a nice supply. I'm guessing someone else makes it. Perhaps if you contact them they will tell you who makes it.

    But there are tons on eBay that are of similar value.
     
    MABDALLA likes this.
  17. takao21203

    Distinguished Member

    Apr 28, 2012
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    The brick for my 10" netbook is Lite-ON and soooo compact and it has 2 Amps.

    What do you want to do with all these laptops? just power them up?
     
  18. MABDALLA

    Thread Starter New Member

    Jan 21, 2014
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    yes I just want power running thru so I can trace where the no power fault is coming from fix it than test to make sure they power up another thing I was looking for is a universal power button but for now I'm just shorting signal to ground to power up
     
  19. t06afre

    AAC Fanatic!

    May 11, 2009
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    You should know that most modern laptops communicate with the charger. If a wrong charger is used. It is very probably that the laptop even wont fire up. In best it will refuse to charge the batteries
     
  20. MABDALLA

    Thread Starter New Member

    Jan 21, 2014
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    can you elaborate on how they do this?? no where in the circuit do i see such thing…the only thing laptop looks for DCIN at charging chip and a certain voltage at ACIN….the SIO chip detects battery presence and the charging chip charges the battery…for laptop to power up there must be atleast 3.3v and 5v as well which is distributed by a pwm regulator…

    as long as the right voltage and current is used the adapter doesnt matter

    so please tell me how the laptop will tell which charger is plugged in as long it is the right tip to plug into jack and correct voltage and current
     
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