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#1
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Laptop charger?
I realize this is not really a homebuilt PC question, but it is a PC
hardware question. I got a laptop that doesn't seem to charge its battery while it's running. You need to completely shutdown the machine, and leave it plugged in, and it'll recharge only then. If you are running the machine with the cord plugged in, and if the charge is anything below 100% charged, it will say that it's charging, but it actually keeps losing its charge (for example, you might see it going down from 75% to 74%, etc.). It will not charge while the machine is running. Is this a problem with the power brick, or is it something within the laptop circuitry itself, do you think? Yousuf Khan |
#2
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Laptop charger?
Yousuf Khan wrote:
I realize this is not really a homebuilt PC question, but it is a PC hardware question. I got a laptop that doesn't seem to charge its battery while it's running. You need to completely shutdown the machine, and leave it plugged in, and it'll recharge only then. If you are running the machine with the cord plugged in, and if the charge is anything below 100% charged, it will say that it's charging, but it actually keeps losing its charge (for example, you might see it going down from 75% to 74%, etc.). It will not charge while the machine is running. Is this a problem with the power brick, or is it something within the laptop circuitry itself, do you think? Yousuf Khan A couple questions: 1) Are you using an "Ebay adapter" instead of the original adapter ? Did the original adapter have three contacts (maybe a TRS barrel), while the current adapter has only two contacts ? If so, the laptop cannot read the properties of the adapter. This happens on laptops that come in two models, and one of the models uses a "high power" adapter. The models make sure the adapter is correct for the job, by checking the ID. 2) Is the battery a replacement battery, perhaps lacking the same fuel gauge as the original ? But that's a stretch. I'd pick (1) before I'd pick (2). And it could easily be a defect in the charging circuit. I don't have a collection of such circuits, so I cannot begin to give a breakdown on what modes they've got and how they're controlled. I presume there's a management IC for this purpose (figuring out when to charge, checking charger voltage or current flow). Paul |
#3
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Laptop charger?
On 22/11/2017 12:52 PM, Paul wrote:
A couple questions: 1) Are you using an "Ebay adapter" instead of the original adapter ? Did the original adapter have three contacts (maybe a TRS barrel), while the current adapter has only two contacts ? If so, the laptop cannot read the properties of the adapter. This happens on laptops that come in two models, and one of the models uses a "high power" adapter. The models make sure the adapter is correct for the job, by checking the ID. No, it's actually still using its original Toshiba adapter. That's partly the reason I'm asking about whether the power brick might be the cause, because it is slightly old by now? The brick is a 3-prong brick, rather than a 2-prong. 2) Is the battery a replacement battery, perhaps lacking the same fuel gauge as the original ? But that's a stretch. Yes, it is actually a replacement battery, but this same problem was occurring using the original battery too. I didn't bring up this question in the past, as I figured that maybe replacing the original system battery would fix this. I then did replace the battery but the problem is still occurring. I'd pick (1) before I'd pick (2). And it could easily be a defect in the charging circuit. I don't have a collection of such circuits, so I cannot begin to give a breakdown on what modes they've got and how they're controlled. I presume there's a management IC for this purpose (figuring out when to charge, checking charger voltage or current flow). Seeing as I've already replaced the original system battery, I'm thinking perhaps the original system power brick may not be producing enough wattage, thus it can't seem to recharge the battery and keep the system powered on at the same time? Thus should I replace the system brick now? -- Sent from Giganews on Thunderbird on my Toshiba laptop |
#4
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Laptop charger?
Yousuf Khan wrote:
Seeing as I've already replaced the original system battery, I'm thinking perhaps the original system power brick may not be producing enough wattage, thus it can't seem to recharge the battery and keep the system powered on at the same time? Thus should I replace the system brick now? Maybe it would help, but I just don't have the info I need on laptop battery management to say getting a new one is a sure thing. I think some parts of the circuit use SMPS, some parts are linear, the battery (load side) may be disconnected while in charge state. But I have no documents to back this up. The linear parts of the circuit (battery path), might indeed produce the symptoms you propose. Since the battery does charge when the CPU load is removed, that at least makes your proposal a possibility. That if you got another adapter, it might help out, as the battery charging path isn't completely broken. If the battery didn't charge at all, I wouldn't bother buying another adapter, as there are no positive signs at all it would help. I'd prefer to "break into the cable" and measure the voltage with time. See if the normal 19V level is dropping to 15 or 16V while the CPU is running. If I were to see such a behavior, then I'd be much more willing to go buy another. I would have suggested this by now, but the brick is sealed, and you're not going to find that 3 contact connector "at Radio Shack". I don't have any sort of source for some of those laptop connectors. Yes, the two conductor barrel connector is available at The Source (Bell Canada). There are at least 15 standard sizes for the two conductor barrel. But the coaxial power connectors, they're a complete zero in terms of convenient purchase. Maybe a Chinese seller would carry them, but the odds of finding just the right thing here are pretty poor. Nobody would be building laptop bricks in Canada, because we couldn't compete on price, so there's no need to carry those connectors for prototyping. I think it's worth a shot buying a replacement brick, but I would feel *much better* about this, if I had some volt meter readings to back up my hunch. Just buying the adapter without further confirmation is going way out on a limb. Paul |
#5
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Laptop charger?
On Wed, 22 Nov 2017 12:41:31 +0600, Yousuf Khan
wrote: I realize this is not really a homebuilt PC question, but it is a PC hardware question. I got a laptop that doesn't seem to charge its battery while it's running. You need to completely shutdown the machine, and leave it plugged in, and it'll recharge only then. If you are running the machine with the cord plugged in, and if the charge is anything below 100% charged, it will say that it's charging, but it actually keeps losing its charge (for example, you might see it going down from 75% to 74%, etc.). It will not charge while the machine is running. Is this a problem with the power brick, or is it something within the laptop circuitry itself, do you think? Yousuf Khan It may be the charger function is intended for most of its duty with the laptop in an off state. Will it run the laptop alone, with the battery pulled out? Some laptops offer that for a "feature" while others do not. Feature limitations, perhaps, more relevant to an earlier time when I last looked at a Satellite, Toshiba then being pretty much the best money could buy. And I suspect its charging unit wouldn't be any less about generally meeting quality standards. |
#6
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Laptop charger?
On 11/22/2017 4:36 AM, Yousuf Khan wrote:
On 22/11/2017 12:52 PM, Paul wrote: A couple questions: 1) Are you using an "Ebay adapter" instead of the Â*Â*Â* original adapter ? Did the original adapter have three Â*Â*Â* contacts (maybe a TRS barrel), while the current adapter Â*Â*Â* has only two contacts ? If so, the laptop cannot Â*Â*Â* read the properties of the adapter. This happens on laptops Â*Â*Â* that come in two models, and one of the models uses a Â*Â*Â* "high power" adapter. The models make sure the adapter is Â*Â*Â* correct for the job, by checking the ID. No, it's actually still using its original Toshiba adapter. That's partly the reason I'm asking about whether the power brick might be the cause, because it is slightly old by now? The brick is a 3-prong brick, rather than a 2-prong. 2) Is the battery a replacement battery, perhaps Â*Â*Â* lacking the same fuel gauge as the original ? Â*Â*Â* But that's a stretch. Yes, it is actually a replacement battery, but this same problem was occurring using the original battery too. I didn't bring up this question in the past, as I figured that maybe replacing the original system battery would fix this. I then did replace the battery but the problem is still occurring. I'd pick (1) before I'd pick (2). And it could easily be a defect in the charging circuit. I don't have a collection of such circuits, so I cannot begin to give a breakdown on what modes they've got and how they're controlled. I presume there's a management IC for this purpose (figuring out when to charge, checking charger voltage or current flow). Seeing as I've already replaced the original system battery, I'm thinking perhaps the original system power brick may not be producing enough wattage, thus it can't seem to recharge the battery and keep the system powered on at the same time? Thus should I replace the system brick now? Just for clarification Yousef, I believe Paul meant the output barrel DC connector, Not the AC plug. Rene |
#7
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Laptop charger?
On 11/22/2017 5:33 AM, Paul wrote:
Yousuf Khan wrote: Seeing as I've already replaced the original system battery, I'm thinking perhaps the original system power brick may not be producing enough wattage, thus it can't seem to recharge the battery and keep the system powered on at the same time? Thus should I replace the system brick now? Maybe it would help, but I just don't have the info I need on laptop battery management to say getting a new one is a sure thing. I think some parts of the circuit use SMPS, some parts are linear, the battery (load side) may be disconnected while in charge state. But I have no documents to back this up. The linear parts of the circuit (battery path), might indeed produce the symptoms you propose. Since the battery does charge when the CPU load is removed, that at least makes your proposal a possibility. That if you got another adapter, it might help out, as the battery charging path isn't completely broken. If the battery didn't charge at all, I wouldn't bother buying another adapter, as there are no positive signs at all it would help. I'd prefer to "break into the cable" and measure the voltage with time. See if the normal 19V level is dropping to 15 or 16V while the CPU is running. If I were to see such a behavior, then I'd be much more willing to go buy another. I would have suggested this by now, but the brick is sealed, and you're not going to find that 3 contact connector "at Radio Shack". I don't have any sort of source for some of those laptop connectors. Yes, the two conductor barrel connector is available at The Source (Bell Canada). There are at least 15 standard sizes for the two conductor barrel. But the coaxial power connectors, they're a complete zero in terms of convenient purchase. Maybe a Chinese seller would carry them, but the odds of finding just the right thing here are pretty poor. Nobody would be building laptop bricks in Canada, because we couldn't compete on price, so there's no need to carry those connectors for prototyping. I think it's worth a shot buying a replacement brick, but I would feel *much better* about this, if I had some volt meter readings to back up my hunch. Just buying the adapter without further confirmation is going way out on a limb. Â*Â* Paul To test Any flat 2 or 3 wire low voltage cables I have a pair of test leads with very fine needle points to probe thru the insulation and not have to strip it. WARNING. *Not to be used on line voltage AC cables* Rene |
#8
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Laptop charger?
Rene Lamontagne wrote:
Just for clarification Yousef, I believe Paul meant the output barrel DC connector, Not the AC plug. Rene Yes, I was referring to verifying the 19V DC output of the brick. Stay away from the AC side. Some power bricks have a coaxial three contact power connector. And the third contact carries some sort of config data or something. Some laptops can tell the high power from the low power adapter SKU, from something encoded on the third contact. Paul |
#9
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Laptop charger?
On 22/11/2017 8:51 PM, Flasherly wrote:
It may be the charger function is intended for most of its duty with the laptop in an off state. Will it run the laptop alone, with the battery pulled out? Some laptops offer that for a "feature" while others do not. Feature limitations, perhaps, more relevant to an earlier time when I last looked at a Satellite, Toshiba then being pretty much the best money could buy. And I suspect its charging unit wouldn't be any less about generally meeting quality standards. Yeah, it can run the laptop alone without the battery plugged in. But in the past, it was able to do both. -- Sent from Giganews on Thunderbird on my Toshiba laptop |
#10
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Laptop charger?
On Thu, 23 Nov 2017 08:01:21 +0600, Yousuf Khan
wrote: Yeah, it can run the laptop alone without the battery plugged in. But in the past, it was able to do both. If by both - aside from running without a battery, not to charge properly while running *with* one - yeah, that's empirical hands-on, something has since definitely deteriorated;- I'd also assumed you may have bought it used. . It also might be nice to start from square one, cover the bases, to test and verify that the battery pack replacement, you've already purchased, is the real deal and performing properly. On a laptop power-pack reassembly, saving about half average costs, a friend's method was to research the batteries for specifically obtainable high-quality manufacture. About 6 cells, as I recall. He then used a razor to cut open the sealed battery module. Due to heat, he also had to use a special alloy "silver" solder for wiring their array. Then, as in now, the only rough edge encountered is battery size deviations for standard model nomenclatures. He hadn't gone that far, though, micrometer gauges for exact physical measurements. And when he reassembled, glued the pack back together, there were some issues in matching exactly to the laptop, the best rechargeables "money could buy", which threatened to bulge out and split the pack. |
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