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#42
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cannot power "on" ASUS laptop after power outage
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#43
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cannot power "on" ASUS laptop after power outage
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#44
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cannot power "on" ASUS laptop after power outage
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#45
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cannot power "on" ASUS laptop after power outage
In comp.sys.laptops DecadentLinuxUserNumeroUno wrote:
On Sun, 18 Oct 2015 02:56:21 +0000 (UTC), lid (Computer Nerd Kev) Gave us: In comp.sys.laptops Adam wrote: Thanks, maybe I'm missing something but if desktops can be so nicely standardized, I don't see why laptop PSUs can't be standardized in a similar manner. Probably because there's little commercial incentive, and as the laptop power connector is going to be exposed to your average "idiot user" even a voltage to plug standard wouldn't prevent someone having trouble because they try to use their 12V 4.5A laptop with the 12V 4A power supply from their old one. So what? Supplies are rarely chosen to be fully taxed at their rated output, and it is in fact dangerous to put one into a design that is. Sigh, OK make my example 12V 4A and 12V 7A then. You don't want to have users eating into the safety margin anyway. So picking one that puts out slightly less than the original is nearly always ok as long as it does not present too much ripple at its rated output. There'd have to be a long list of probably tens of power connectors designed for the different current ratings and voltages, You obviously did not examine the link I posted about the current, most commonly used standard DC connector series. Much less know anything about it. True, I thought it was a reference for what you said about 19V power because of where you placed it in your post. But it does not prevent miss-matching current ratings (which is what the "tens" of different connectors would be for) and is not standard across all laptops. or an electronic system for identifying the right power supply Huh? A PC with a 250 W supply can operate just as good as if you place a 1000W supply on it. They BOTH provide the same standard ATX voltages. The PC does not suddenly puke because a more capable supply was placed on the system. The system is the load, and the load does not magically change just because you changed the supply. The right power supply is one with a high enough current rating. It is to prevent the laptop equivalent of someone putting in a 250W desktop PSU to replace a 1000W one. (I think some laptops might do this, but there's no industry standard). Laptops test voltage because battery charging circuits require a minimum spec to operate without puking before their basic MTBF time. If the voltage is too low and they did not test, they would run too hot trying to provide the right charging voltage to the battery, which is higher than the battery's topped off full voltage level. Non-battery driven devices typically do not have a watchdog circuit in them. Although a good ATX power supply has circuits to shut down the supply when it senses a current surge on some of the rails after it has been brought up. Laptop PSUs should have current limiting in them too, but if a laptop is on the edge of the maximum current from a PSU, then it could shut down intermittently or have other problems, the cause of which may not be clear to the user. -- __ __ #_ |\| | _# |
#46
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cannot power "on" ASUS laptop after power outage
In comp.sys.laptops DecadentLinuxUserNumeroUno wrote:
On Sun, 18 Oct 2015 02:29:27 +0000 (UTC), lid (Computer Nerd Kev) Gave us: In comp.sys.laptops DecadentLinuxUserNumeroUno wrote: On Fri, 16 Oct 2015 23:18:40 +0000 (UTC), lid (Computer Nerd Kev) Gave us: On Fri, 16 Oct 2015 09:39:10 -0700 Marek Novotny wrote: On 2015-10-16, Adam wrote: Where's the best chance of getting a compatible AC adapter? Fry's? Radio Shack? Other? ebay. China. Seriously, sometimes it is ridiculously cheap and quick to shop directly (online) in China (Caveat Emptor). I got replacement batteries for my PengPod in less than a week for less than I would have paid locally IF they had even been available, which they were not. Though it should be noted that you take your life into your hands with some of the cheap power supplies that come out of that country, not to mention the life of your equipment. You would have a hard time finding supplies in the COTS market these days that were not made there. So you must not be as all nerded up as you would like folks to think. As I read the thread, the recommendation was for the OP to buy a power supply directly from China via an Ebay listing. Fake OEM power supplies as well as honest knock-offs from China litter Ebay listings for replacement power supplies and many have the issues I mentioned. Even legitimate, direct from the maker supplies are made IN CHINA. Jeez, can you really be that much in the dark? Of course not, I'm making it clear that I'm talking about the cheap power supplies advertised on EBAY in China, most of which are not genuine OEM products, regardless of whether the genuine OEM product is also made in China. -- __ __ #_ |\| | _# |
#47
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cannot power "on" ASUS laptop after power outage
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#48
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cannot power "on" ASUS laptop after power outage
On Sun, 18 Oct 2015 03:42:46 +0000 (UTC), lid
(Computer Nerd Kev) Gave us: Of course not, I'm making it clear that I'm talking about the cheap power supplies advertised on EBAY in China, most of which are not genuine OEM products, regardless of whether the genuine OEM product is also made in China. I never said a damned thing about using a supply that has been falsely labeled as an OEM replacement. |
#49
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cannot power "on" ASUS laptop after power outage
In comp.sys.laptops DecadentLinuxUserNumeroUno wrote:
On Sun, 18 Oct 2015 02:32:43 +0000 (UTC), lid (Computer Nerd Kev) Gave us: Probably China, but ASUS should have some control over the design and manufacture. No. The chinese ps makers have their own engineers and are the best at it after decades of doing it (literally), and ASUS picks one from their lines and has several M of them made, and they only thing they get that is custom is the labeling and a guarantee that they will not kill (read stop producing) the model. Then that's the control ASUS have over the design and manufacture of their power supplies. Cheap ones from Ebay do not have the assurance of that approval by the laptop manufacturer. Knock-offs bought directly from China may not have been adiquately designed for the application, Nobody said anything about buying a false branded "knock-off". There are literally hundreds of ps makers who make good products and they do not need a brand sticker to guarantee tagged performance. That is what CE and TUV and UL certs are for. And YES, they ARE valid cert declarations. Sheesh. Some of the laptop power supplies on Ebay are fake OEM products, I should have said "third party" instead of knock-off, but I meant ones that are not OEM branded. Either way, there is little assurance that the design is sound and truely approved. There are plenty of poor charger designs, some with fake certifications, shown in teardowns on the web. -- __ __ #_ |\| | _# |
#50
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cannot power "on" ASUS laptop after power outage
On Sun, 18 Oct 2015 03:53:15 +0000 (UTC), lid
(Computer Nerd Kev) Gave us: In comp.sys.laptops DecadentLinuxUserNumeroUno wrote: On Sun, 18 Oct 2015 02:32:43 +0000 (UTC), lid (Computer Nerd Kev) Gave us: Probably China, but ASUS should have some control over the design and manufacture. No. The chinese ps makers have their own engineers and are the best at it after decades of doing it (literally), and ASUS picks one from their lines and has several M of them made, and they only thing they get that is custom is the labeling and a guarantee that they will not kill (read stop producing) the model. Then that's the control ASUS have over the design and manufacture of their power supplies. Cheap ones from Ebay do not have the assurance of that approval by the laptop manufacturer. Knock-offs bought directly from China may not have been adiquately designed for the application, Nobody said anything about buying a false branded "knock-off". There are literally hundreds of ps makers who make good products and they do not need a brand sticker to guarantee tagged performance. That is what CE and TUV and UL certs are for. And YES, they ARE valid cert declarations. Sheesh. Some of the laptop power supplies on Ebay are fake OEM products, I should have said "third party" instead of knock-off, but I meant ones that are not OEM branded. Either way, there is little assurance that the design is sound and truely approved. There are plenty of poor charger designs, some with fake certifications, shown in teardowns on the web. No need for any tear down. Place the output on a scope and put the supply under its full rated load and look at the ripple. It really is that simple. Come back an hour later and check the case temperature and ripple again. Easy greasy chin-o-****in-nesey. |
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