Date: 25/07/2013 17:20:06
From: JTQ
ID: 355324
Subject: Laptop power source
Hi all…
I have a laptop that I have lost the original power plug. I have instead, a universal power supply with different adaptor plugs to fit into whatever type of laptop I have.
The universal supply is output DC 19.0V 3.2A, 65W. The battery in the laptop is DC 11.1V 4.4A.
The guy in the computer shop had no idea if it would cause a problem or not.
Can someone confirm for me if it will work or will I see fireworks? I don’t need to permanently power the laptop with this power supply, it’s only temporary until I get a proper power supply for it.
Date: 25/07/2013 17:23:55
From: transition
ID: 355327
Subject: re: Laptop power source
Bit on the high side fella.
Date: 25/07/2013 17:25:43
From: Angus Prune
ID: 355328
Subject: re: Laptop power source
JTQ said:
Hi all…
I have a laptop that I have lost the original power plug. I have instead, a universal power supply with different adaptor plugs to fit into whatever type of laptop I have.
The universal supply is output DC 19.0V 3.2A, 65W. The battery in the laptop is DC 11.1V 4.4A.
The guy in the computer shop had no idea if it would cause a problem or not.
Can someone confirm for me if it will work or will I see fireworks? I don’t need to permanently power the laptop with this power supply, it’s only temporary until I get a proper power supply for it.
19V seems a little high. Does it say anywhere on the outside of the laptop what input it needs? If it’s anywhere, it would be stamped pretty close to the power supply socket.
Date: 25/07/2013 17:27:33
From: JTQ
ID: 355329
Subject: re: Laptop power source
Hmm… it doesn’t say anywhere on it what the input power requirement is. It’s a Samsung N145 Plus, so I’ll have a look online for specs and be back in a tic…
Date: 25/07/2013 17:27:52
From: party_pants
ID: 355330
Subject: re: Laptop power source
What does the computer specify should be the input power to the laptop’s power socket? It should be printed on the computer somewhere.
My Dell at work is 19 volts, my Toshiba at home is 11.something volts.
Date: 25/07/2013 17:28:52
From: transition
ID: 355331
Subject: re: Laptop power source
Date: 25/07/2013 17:29:55
From: JTQ
ID: 355332
Subject: re: Laptop power source
40Watts Adapter
6 Cell 5,900mAh 11.3Vdc 66.67Wh Battery
http://www.samsung.com/levant/consumer/computers-peripherals/laptops/netbook/NP-N145-JP04JO-spec
Date: 25/07/2013 17:31:05
From: JTQ
ID: 355333
Subject: re: Laptop power source
40Watts Adapter
6 Cell 5,900mAh 11.3Vdc 66.67Wh Battery
http://www.samsung.com/levant/consumer/computers-peripherals/laptops/netbook/NP-N145-JP04JO-spec
That’s the power requirements as listed on that page, but nothing listed on the laptop itself, apart from what’s printed on the battery sticker.
Date: 25/07/2013 17:34:14
From: transition
ID: 355335
Subject: re: Laptop power source
This one floats unloaded at 19.56V, and centre pin positive which be fairly standard.
Date: 25/07/2013 17:36:21
From: transition
ID: 355336
Subject: re: Laptop power source
just ripped battery out is 10.8Volt.
Date: 25/07/2013 17:37:48
From: JTQ
ID: 355337
Subject: re: Laptop power source
So the consensus is that I shouldn’t try plugging it in…
:)
Date: 25/07/2013 17:40:56
From: party_pants
ID: 355339
Subject: re: Laptop power source
JTQ said:
So the consensus is that I shouldn’t try plugging it in…
:)
Take it back and ask to swap it for an 11.3 volt one.
Date: 25/07/2013 17:41:20
From: wookiemeister
ID: 355340
Subject: re: Laptop power source
JTQ said:
Hi all…
I have a laptop that I have lost the original power plug. I have instead, a universal power supply with different adaptor plugs to fit into whatever type of laptop I have.
The universal supply is output DC 19.0V 3.2A, 65W. The battery in the laptop is DC 11.1V 4.4A.
The guy in the computer shop had no idea if it would cause a problem or not.
Can someone confirm for me if it will work or will I see fireworks? I don’t need to permanently power the laptop with this power supply, it’s only temporary until I get a proper power supply for it.
find the manual for the laptop
it should tell you the power/voltage requirements for that device
Date: 25/07/2013 17:42:59
From: transition
ID: 355341
Subject: re: Laptop power source
No I couldn’t advise such a thing, but if it helps you can say I held a gun to your head.
It’s very close to same battery terminal voltage as my HP, and your power pack is same voltage too.
But don’t know if your centre-pin polarity is good.
Date: 25/07/2013 17:44:03
From: Angus Prune
ID: 355342
Subject: re: Laptop power source
I went to all the trouble of downloaded and reading the manual (what kind of company has an .exe manual instead of pdf?) and it doesn’t even say! Just says to contact your authorised dealer/reseller…
Date: 25/07/2013 17:45:12
From: JTQ
ID: 355343
Subject: re: Laptop power source
Hmmmm……
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=230985089544&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en
This is the replacement adapter for the laptop, and clearly shows in the pic “Output 19V 2.1A”
I don’t know where the laptop manual is, I got it a few years ago. Maybe there’s one available online somewhere…
Date: 25/07/2013 17:46:57
From: wookiemeister
ID: 355344
Subject: re: Laptop power source
http://compare.ebay.com.au/like/200944142262?ltyp=AllFixedPriceItemTypes&cbt=y&_lwgsi=y&item_id=200944142262
About 61,800 results (0.26 seconds)
samsung n145 plus power supply
Date: 25/07/2013 17:47:00
From: JTQ
ID: 355345
Subject: re: Laptop power source
Angus Prune said:
I went to all the trouble of downloaded and reading the manual (what kind of company has an .exe manual instead of pdf?) and it doesn’t even say! Just says to contact your authorised dealer/reseller…
Lol … apparently Samsung has an .exe manual, just found on their website
Date: 25/07/2013 17:48:00
From: wookiemeister
ID: 355347
Subject: re: Laptop power source
wookiemeister said:
http://compare.ebay.com.au/like/200944142262?ltyp=AllFixedPriceItemTypes&cbt=y&_lwgsi=y&item_id=200944142262
About 61,800 results (0.26 seconds)
samsung n145 plus power supply
15 bucks
Date: 25/07/2013 17:51:00
From: JTQ
ID: 355348
Subject: re: Laptop power source
Looking at the manual, it says in Specifications, “Output Power 40W, Output Voltage 19VDC 2.1A (40W)”
So why would the battery have an output of 11.1VDC and the power supply have 19.0VDC?
Date: 25/07/2013 17:52:51
From: wookiemeister
ID: 355349
Subject: re: Laptop power source
http://www.ebay.com.au/itm/AC-Adapter-Samsung-N145-Plus-NP-N145-Notebook-Charger-Power-Supply-Cord-/370597812752#vi-content
picture shows positive centre pin
Date: 25/07/2013 17:54:45
From: wookiemeister
ID: 355350
Subject: re: Laptop power source
AC ADAPTER Charger for SAMSUNG N145 Plus, 19V 2.1A
http://compare.ebay.com.au/like/321169018402?ltyp=AllFixedPriceItemTypes&cbt=y&_lwgsi=y&lpid=15-62-80&item_id=321169018402
Date: 25/07/2013 17:55:24
From: party_pants
ID: 355351
Subject: re: Laptop power source
JTQ said:
Looking at the manual, it says in Specifications, “Output Power 40W, Output Voltage 19VDC 2.1A (40W)”
You’re laughing then. Just make sure you choose the right input pin.
Date: 25/07/2013 17:56:29
From: wookiemeister
ID: 355352
Subject: re: Laptop power source
http://www.ebay.com.au/itm/Samsung-N145-Plus-NP-N310-N310-19V-2-1A-AD-4019-AD-4019S-ADP-40NH-AC-Adapter-/230985089544#vi-content
shows everything in picture
Date: 25/07/2013 18:01:04
From: JTQ
ID: 355354
Subject: re: Laptop power source
wookiemeister said:
http://www.ebay.com.au/itm/Samsung-N145-Plus-NP-N310-N310-19V-2-1A-AD-4019-AD-4019S-ADP-40NH-AC-Adapter-/230985089544#vi-content
shows everything in picture
Yeh, that’s probably the one I’ll be getting. At the moment, I have just plugged this universal one in and it has come on. The screen was broken, so I pulled it all apart yesterday and replaced the screen with a brand new LED one, and it works :) :) :)
Now to put in the new hard drive I bought today, then go home and find my Windows 7 install CD and install that with Office 2010. Then give the bloody thing away.
Date: 25/07/2013 18:04:15
From: wookiemeister
ID: 355357
Subject: re: Laptop power source
JTQ said:
wookiemeister said:
http://www.ebay.com.au/itm/Samsung-N145-Plus-NP-N310-N310-19V-2-1A-AD-4019-AD-4019S-ADP-40NH-AC-Adapter-/230985089544#vi-content
shows everything in picture
Yeh, that’s probably the one I’ll be getting. At the moment, I have just plugged this universal one in and it has come on. The screen was broken, so I pulled it all apart yesterday and replaced the screen with a brand new LED one, and it works :) :) :)
Now to put in the new hard drive I bought today, then go home and find my Windows 7 install CD and install that with Office 2010. Then give the bloody thing away.
the details on the powersource in the picture shows the voltage and power used, by the looks of other info it looks like a centre positive
Date: 25/07/2013 18:09:40
From: sibeen
ID: 355359
Subject: re: Laptop power source
JTQ said:
Looking at the manual, it says in Specifications, “Output Power 40W, Output Voltage 19VDC 2.1A (40W)”
So why would the battery have an output of 11.1VDC and the power supply have 19.0VDC?
The laptop will have a dc/dc converter in its power supply. This will be able to take in reasonable varying DC voltage and provide a stable output voltage for the computer. It will also provide the charge to the battery and manage this so that the battery is not damage by too high a charging current or too high a voltage.
As to the voltage, a 12 volt car battery is not charged at 12 volts. In fact the charging voltage, at float charge, is up at around 13.7 volts. The 12 volts is what you expect to see on a battery when it is fully charged and not connected to anything. The same will go for the laptop battery.
Date: 25/07/2013 22:12:07
From: transition
ID: 355574
Subject: re: Laptop power source
Some extra voltage there might be useful in the case batteries are flat and charging/low charge state, no good or removed. Not so demanding of transient response of PS to load changes, which may not be entirely unrelated to current limiting action. The internal SMPS impedance matching may be arranged for better performance over greater variables, and the internal PS requirements may be simplified.
If the maximum from the external inline supply were 4A, if it were 12 volts this only gives you 48Watts, if it is 19Volts this gives you 76Watts. I x V = W.
In the old days, of linear power supplies, you’d have immediately lost – of similar example as above – 28Watts to heat, then some.