9rpcrowe
Posts: 9
Joined: Fri Dec 30, 2016 6:11 pm
Location: Salem, SC

Laptop Power problem

Mon Sep 25, 2017 1:09 pm

ok I have a laptop that was refurbished when I bought it and it came with a cheap Chinese power adapter and it didn't work well I fit that with one of my own and a little soldering but now It broke and I need a new one and I'm gonna build one cause I don't wont to spend 50 dollars on a power adapter. here are the specs

input

voltage 100 VAC- 240 VAC
1.5 - 1.6 Amps
50- 60 Hz

Output is
65 watts - 90 watts
3.34 amps - 4.62 amps
19.5 +/- 1.00 VDC

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RaTTuS
Posts: 9570
Joined: Tue Nov 29, 2011 11:12 am
Location: North West UK

Re: Power problem

Mon Sep 25, 2017 1:18 pm

bsaically don't

I'd buy one myself ,

https://www.aliexpress.com/item/19-5V-4 ... 73236.html
but YMMV on usefulness
How To ask Questions :- http://www.catb.org/esr/faqs/smart-questions.html
WARNING - some parts of this post may be erroneous YMMV

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9rpcrowe
Posts: 9
Joined: Fri Dec 30, 2016 6:11 pm
Location: Salem, SC

Re: Power problem

Mon Sep 25, 2017 1:41 pm

did you not see the 12 to 20 days it would take I mean I need it asap and its expensive for expedited shipping

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RaTTuS
Posts: 9570
Joined: Tue Nov 29, 2011 11:12 am
Location: North West UK

Re: Power problem

Mon Sep 25, 2017 1:43 pm

buy one from a local shop , it's going to take you longer to build one if you have not done it before
and it will be a hell of a lot more dangerous
mains electricity can, and does kill
How To ask Questions :- http://www.catb.org/esr/faqs/smart-questions.html
WARNING - some parts of this post may be erroneous YMMV

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9rpcrowe
Posts: 9
Joined: Fri Dec 30, 2016 6:11 pm
Location: Salem, SC

Re: Power problem

Mon Sep 25, 2017 1:44 pm

I live in the middle of nowhere.

also I don't have a lot of money

but I do have a lot of scrap

csnape
Posts: 1
Joined: Mon Sep 25, 2017 11:43 am
Location: UK
Contact: Website

Re: Power problem

Mon Sep 25, 2017 2:18 pm

I am a little confused as to what the question is. Personally its sometimes best to look for a replacement PSU as they dont cost that much and if its as old as you can suggest you should be able to find a suitable replacement at low cost on amazon or ebay.

Most laptop PSU's are switch mode which means they convert AC to DC and then back into AC at high frequency which is how they get away with using smaller transformers. This makes them cheap but also they can be difficult to repair and constructing one can be quite challenging.

drgeoff
Posts: 7404
Joined: Wed Jan 25, 2012 6:39 pm

Re: Power problem

Mon Sep 25, 2017 4:12 pm

@9rpcrowe
Why have you posted here in a RPi forum and what is your question?

Your situation is nothing to do with RPi. You clearly had decided what you are going to do before posting here. And you are not accepting good advice to the contrary.

9rpcrowe
Posts: 9
Joined: Fri Dec 30, 2016 6:11 pm
Location: Salem, SC

Re: Laptop Power problem

Tue Sep 26, 2017 2:41 pm

I want to build one because like I said I don't have a lot of money to spend on a power cord when all I need is just an adapter and I could make one smaller than the big bulky one from Dell. and I kinda want to learn i mean these forms are for help right this thread night not be in the Right place but I thought it would be better than nothing I have plenty of scrap like copper wire and stuff so please I've given the requirements for it.

pcmanbob
Posts: 2047
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: Laptop Power problem

Tue Sep 26, 2017 3:42 pm

This is an example of the sort of circuit you might find in a laptop PSU. ( probably not even close to the actual one you would need for your specific laptop )
Image

if you think you can build this from scrap then I am sorry but you are living in cloud Cuckoo land, even if you could by some miracle find all the right components you would still need a PCB to mount them on.

Please just take the good advice that has already been given and go buy one.
Last edited by pcmanbob on Wed Sep 27, 2017 9:22 am, edited 1 time in total.
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Remember we want information.......................no information no help

berrymix
Posts: 13
Joined: Thu May 25, 2017 2:03 am
Location: Florida

Re: Laptop Power problem

Wed Sep 27, 2017 7:19 am

You should have it check at a local center. But if you're techy enough then you can try to follow @pcmanbob instruction.

alphanumeric
Posts: 1248
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Laptop Power problem

Fri Sep 29, 2017 11:54 am

I'm a retired electronic technician and I wouldn't tackle trying to make my own switching power supply, ever. An old style transformer style yes. If I had to, in a pinch, and I had the parts on hand. It wouldn't be pretty or very portable. It's a lot easier than a switching mode power supply though. Big transformer to take the 120 VAC down to what you need. Bridge rectifier to convert it to DC. Filter capacitor to smooth it out. Then a voltage regulator to get the exact voltage you need. Still not all that easy if your just using parts you have on hand. You'll need a multimeter, soldering iron, and some skill. Have you ever done any electronics work before? Do you have the tools on hand to remove the components you need without damaging them in the process?

drgeoff
Posts: 7404
Joined: Wed Jan 25, 2012 6:39 pm

Re: Laptop Power problem

Fri Sep 29, 2017 4:13 pm

9rpcrowe wrote:
Tue Sep 26, 2017 2:41 pm
and I could make one smaller than the big bulky one from Dell
No you could not.

Neil_Hines
Posts: 6
Joined: Fri Sep 29, 2017 11:51 am

Re: Power problem

Wed Oct 04, 2017 7:02 am

RaTTuS wrote:
Mon Sep 25, 2017 1:18 pm
bsaically don't

I'd buy one myself ,

https://www.aliexpress.com/item/19-5V-4 ... 73236.html
but YMMV on usefulness
What did you buy friend? The link you are showing its not working?

drgeoff
Posts: 7404
Joined: Wed Jan 25, 2012 6:39 pm

Re: Power problem

Wed Oct 04, 2017 11:12 am

Neil_Hines wrote:
Wed Oct 04, 2017 7:02 am
RaTTuS wrote:
Mon Sep 25, 2017 1:18 pm
bsaically don't

I'd buy one myself ,

https://www.aliexpress.com/item/19-5V-4 ... 73236.html
but YMMV on usefulness
What did you buy friend? The link you are showing its not working?
That link is working fine as I type this.

US$10.49 inc. shipping to UK for "19.5V 4.62A 90W Ac Power Adapter Charger For Dell Laptop Ad-90195D Pa-1900-01D3 Df266 M20 M60 M65 M70 7.4Mm * 5.0Mm"

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