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One charger for Ideapad 510 and Thinkpad T540

Q: One charger for Ideapad 510 and Thinkpad T540

I have a Thinkpad T540 from work, and a private Ideapad 510. I'm looking for a wall charger solution that can be used for any of these laptops, which I could keep in my bag, regardless of which laptop I take with me. Both use 20V power. The Thinkpad charger produces 4.5A (90W), I think that power source should work fine with the Ideapad that requires just 3.25A (65W). Is there a solution to convert the Thinkpad's rectangular plug (slim tip) to the the very small power plug used by the Ideapad 510 (round, 4mm outer, 1.7mm inner) ? Alternatively, is there any universal charger available, which offers both plugs? Thanks,Kai

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RELEVANCY SCORE 200
Preferred Solution: One charger for Ideapad 510 and Thinkpad T540

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RELEVANCY SCORE 71.6

Im considering adding a Samsung 850 EVO 500 gb SSD to my T540 Thinkpad. I would do this by removing the dvd drive, and buying a harddrive caddy. Ideally, I would then transfer my OS (Win 10) to the SSD to speed up the system. Anyone have any experience doing this? Any issues I should be aware of?

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RELEVANCY SCORE 55.6

Hello,I have broken the rectangular charger tip from original charger and it's all wonky, almost impossible to charge the laptop. I have been looking for information on z50-70 compatible chargers, but failed to find any useful information, Lenovo doesn't provide any and the same charger that I have (ADLX65NCC3A 65W 20V) is not available in my country. Is any lenovo charger with rectangular plug, 65W and 20A is compatible? What about non-lenovo brands? Could you suggest any?

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RELEVANCY SCORE 55.6

Hi, My original charger was bitten by my dog, and I have new charger from lenovo computer.   The old charger was 2.25A and the new one is 3.25, Both 20V. The lenovo support site say I can use the 3.25 But label on the computer say I can not [image attached] Help Please! Can I use it? 

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RELEVANCY SCORE 55.6

Unlike other laptops I've had which were able to run without the battery even in the laptop, i.e. Only plugged in, my laptop requires some level of charging before even turning on when plugged in.  is this normal or is there a setting to allow the device to turn on when plugged in. Quite a pain having to wait for it to re charge, isn't that the point of corded use? Also it seems to die pretty quickly and even when put to sleep when closed fizzles out quickly. Again is this normal?

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RELEVANCY SCORE 55.6

Hello,I have broken the rectangular charger tip from original charger and it's all wonky, almost impossible to charge the laptop. I have been looking for information on z50-70 compatible chargers, but failed to find any useful information, Lenovo doesn't provide any and the same charger that I have (ADLX65NCC3A 65W 20V) is not available in my country. Is any lenovo charger with rectangular plug, 65W and 20A is compatible? What about non-lenovo brands? Could you suggest any?

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RELEVANCY SCORE 55.6

I have several Lenovo chargers round grey connector. Is there an adaptor available to fit a ref IdeaPad?

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RELEVANCY SCORE 54.8

HiI cant find the right charger for the Ideapad 310. Does anyone have a link to the right one? When I ordered I got this big USB charger thing. I need a reaaly small round charger that fits my computer

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RELEVANCY SCORE 54.8

Greetings. The charger for my Ideapad 100s has failed. I have tried to find a replacement on the Lenovo website but I can not seem to locate. Could anyone direct me to a compatible charger? Thank You.










Solved!
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A:Lenovo Ideapad 100s charger

Hi Rivera,
 
Welcome to the Lenovo community!
 
Please provide the system model number( MTM ) for further assistance.
Note: Please do not share system serial number here.
 
Let us know how you get on.
 
Regards,
Shashi
 
Tap that kudos button if I helped  If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! 

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RELEVANCY SCORE 54.8

 In the course of using my 13 (Type 20GJ, 20GK) Laptop (ThinkPad), my external battery charger got damaged. Part of the male end that goes into the computer to charge it has somehow split in half; as a result of this, it no longer fits into my computer and my computer doesn't charge.  So my questions are as follows:1) Instead an AC Adapter model # ADLX45DLC2A, could I temporarily use a replacement AC charger model # ADLX90NCC2A that is rated at a slightly higher amperage? Would using it cause problems for my computer? 2) If not, how would I go about getting a replacement AC charger? Thanks for responding to this in advance.

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RELEVANCY SCORE 54.8

Does anyone know where I can buy an Thinkpad External Battery Charger for  Lenovo ThinkPad68+6 Cell Battery part no Lenovo 0C52862. I am based in the UK Thank you 

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RELEVANCY SCORE 54.8

Hello. I have a plan to buy a T460 during the upcoming Christmas sales. I also want to buy an extra battery with it. As a business person who has to travel a lot, i would love to keep both of my batteries fully charged all the times. External battery chargers are hard to find and i, after a lot of search, found one. An old Lenovo support document (https://support.lenovo.com/us/en/documents/ht037009) shows a list of batteries that can be charged using that charger. But T460's Thinkpad 68+ 6 cell 72 Wh battery is not in that list. And, that doc says that i will need a 65W ac power adapter for charging. But T460 comes with 45W power adapter. So my questions are: 1) Can i charge T460's battery with the external charger? 2) Will 45W power adapter be enough or do i have to buy a 65W one? Thank you very much in advance for your time.

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RELEVANCY SCORE 54.4

Hello  I'm new here so if i'm not posting this in the right place please correct me  Anyway , im here because i recently bought a new lenovo ideapad notebook Z500 , and just out of curiosity i want to know if the charger i got with it is the original one made for this computer , i mean is there a place where i can check with the serial number , id ... of both laptop and charger  Thanks for your time

A:Lenovo ideapad z500 charger authenticity

Hi Griwwi,
 
Welcome to Lenovo Community!
 
I understand your concern, but these are internal information and not available online for confirmation. Hence, I would suggest you to contact our Technical Support for further Assistance to get the regarding the concern.
 
Click here to open a link where you can select the country and get the exact contact support number. I?m sure they will be a great help.
 
Do post us back for further queries.
 
Best Regards
Shiva Kumar



Did someone help you today? Press the star on the left to thank them with a Kudo!If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.Follow @LenovoForums on Twitter!

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RELEVANCY SCORE 54.4

Hi Folks, I bought a Lenovo Ideapad Flex 5 14 81C90004US 2 in 1 PC from the Microsoft Store.  Now I would like to purchase an extra charger for it.  One would think that this would be simple, but being that this is an IBM product, nothing is simple.  I talked to Online Sales on Live chat and they have no clue what I need to order and Google searches are coming back with multiple different chargers The current charger that came with the laptop is 65w, 20v.   The model number is: ADLX65NCC3A.  When I search this model, the charger that shows up in Google results or Amazon results has a USB type end that connects to the laptop.  I have a round pin end. The Part number is: SA10M42747.  When I search this part number, the charger that shows up looks nothing like the charger I have.  I have a old style laptop charger where a three pin connector goes into the wall, the other end goes into a block .  The charger that shows up with that part number has the whole block attaching to the wall using a 2 pin connector. Can anyone please direct me in the right direction. Thanks.

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RELEVANCY SCORE 54.4

Hi Folks, I bought a Lenovo Ideapad Flex 5 14 81C90004US 2 in 1 PC from the Microsoft Store.  Now I would like to purchase an extra charger for it.  One would think that this would be simple, but being that this is an IBM product, nothing is simple.  I talked to Online Sales on Live chat and they have no clue what I need to order and Google searches are coming back with multiple different chargers The current charger that came with the laptop is 65w, 20v.   The model number is: ADLX65NCC3A.  When I search this model, the charger that shows up in Google results or Amazon results has a USB type end that connects to the laptop.  I have a round pin end. The Part number is: SA10M42747.  When I search this part number, the charger that shows up looks nothing like the charger I have.  I have a old style laptop charger where a three pin connector goes into the wall, the other end goes into a block .  The charger that shows up with that part number has the whole block attaching to the wall using a 2 pin connector. Can anyone please direct me in the right direction. Thanks.

A:Charger for Lenovo Ideapad Flex 5 14 81C90004US 2 in 1 PC

Hi Enigma2017,
 
Greetings.
 
You can privately message me the serial number or use your SN here on the parts lookup page to get the Lenovo part number. 
 
When I used the model type81C9. it gave me 25 compatible adapters as shown here.
Lenovo part number 01FR051 have Chicony ADLX65NCC3A 20V3.25A RCOO
 
Part sales order : Call: (800) 263-2769 Canada
 
Update us soon as convenient.
 
Regards

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RELEVANCY SCORE 54.4

I can't get a generic power adapter to work with my Lenovo Ideapad, and I have no idea why. All of the appropriate electrical numbers match. And to add insult to injury, the charger works fine with my wife's less expensive model. I've tried plugging and unplugging, uninstalling the Microsoft controller, uninstalling Lenovo Power Management?in short, all the solutions you commonly see on the web, and none of them fix the problem.  The computer simply won't recognise the charger.  It's a serious problem with the Ideapad?this is the first computer I've ever owned that had a power cord go bad in more than three decades of owning computers! Why won't a generic work on my Lenovo while it will on my wife's Lenovo? A money grab by Lenovo? Does anyone know how to fix the problem without me being forced by Lenovo to buy their overpriced charger? Thanks.

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RELEVANCY SCORE 54.4

it is safe that my laptop is always plugin???i have on the conversation mode it will stop charging at 60%, but can i ask if its safe to always plug in my charger while im using my laptop, will the charger be broken or explode? or damage the loptop, i use it every day most of the time playing games that is why it is always plug in , in his chargerit is ok??? if its always plig in in a charger laptop???? tnx verry much

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RELEVANCY SCORE 54.4

I'm using IDEAPAD 500 which is currently under warranty. The charger of my laptop suddenly stopped working so when I visited the service centre for my warranty claim they told me that the charger which I was using from the day 1 actually doesn't belong to my Laptop.Then they are continuously declining to provide me with the service for my adapter and are saying to buy a new adapter.Someone Please help me out and tell me is that my fault that I received the wrong item and if not then why should I pay  for the mistakes which aren't done by me.

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RELEVANCY SCORE 54.4

I googled for some time and could find solutions without using screw drivers as this has built in battery. I got this laptop like a month ago. its working fine on day 1 but the following days, I cant turn it on without using charger even though the battery is 100% charged. When on battery, it wont turn on. Then I plug in the charger and tried to turn on but it wont start. The plug in light is on. And I would need to wait for around 30 minutes to try to turn on again. When turning on it would show something like this. Sometimes, the screen would blink in dark green and I can hear the starting up sound repeatedly but it just wont start. Anyone can help with solutions without the need to open the laptop as I have no clue to do that? Thanks in advance

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RELEVANCY SCORE 54.4

I have IdeaPad Z570, what happened is once I turned my laptop on and it booted well and turned on as normal. While working I saw that the battery has a low charge so I inserted the charger plug into the laptop and turned on the mains, the moment I turned on the mains the laptop went dead and the LED indicator on the charger that is the orange LED started blinking. Now the laptop is not turning on and whenever I insert the carger into the laptop the LED of the charger starts blinking otherwise it isnt that is when it is not inserted. I have checked the charger with a multimeter and it is fine. Now what to do?

A:IdeaPad Z570 AC charger LED blinking and laptop do...

hi apoorvsarode,
 
Welcome to Lenovo Community Forums!
 
Can you try Removing the battery and unplugging the AC adapter,
    Then hold down the power button for at least 10 sec.
Now try Reconnecting everything and see if it will charge fine.
 
If not-
 
Try Removing the Battery and plugging in the Ac adapter see if that will work,
 
Let me know your findings
Cheers!
 



Did someone help you today? Press the star on the left to thank them with a Kudo!If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.Follow @LenovoForums on Twitter!

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RELEVANCY SCORE 54

Hi,First of all sorry for the bad english. It is not my native language. I upgraded my E550 to the new aniversery update from windows 10. And since a couple of days my computer freezes when I'm unplugging my chargerI have to press the power down button to restart it and to get it to work again. When I restart my Laptop the battery is not charging when I my charger is plugged in.Also when I do that it sometimes creates a BSOD with a message DPC_WATCHDOG_VIOLATION And when all this is over it works fine again. I tried searching for driver updates but I don't find a new version of the charger driverAnd I didn't came across other people with the same issue. I also don't see the point in upgrading the BIOS since my laptop (like most) starts in UEFI Kind regards Brecht  

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RELEVANCY SCORE 54

Hi!I have Samsung Galaxy S8. It have USB Type-C connector and charger which can deliver up to ~18W(?). I know from some sources that I can charge my phone via Laptop charger (it will step down voltages and amps accordingly). But I'm curious if it will work another way around. So if I can charge X1 Yoga 2 with Samsung Galaxy S8 charger?Best RegardsTomas.

A:Thinkpad X1 Yoga 2 Charging via phone charger

No.  You need 20V output, 45W

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RELEVANCY SCORE 54

I am only able to use the laptop when connected to mains power and not on battery.
 

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RELEVANCY SCORE 53.6

My Dell Inspiron 17R 5720 doesn't recognize charger any more. And unfortunately my warranty expired 2 month ago.It was plugged in and working in the morning, but then in the afternoon I noticed that it was running on the battery only. It wont start without battery (just charger plugged in).
1. So here what I have done to debug. Me and my brother, we have purchased the same Dell laptops at the same time a year and a bit ago. This is why for a debugging purposes it was good.I took my charger and plugged in to his computer. And it works. Definitely not the charger issue I guess. And when I plug charger in to my computer, green light is still on the charger. And I have the original charger that came with the laptop.
2. Now, laptop works on the battery only, so this means that motherboard is working. I guess.
3. Next thing I did was unplugged charger and removed the battery from the laptop. Then I pushed and hold "Power" button for 45 seconds to discharge a flea charge. Plugged charger back in but laptop wont start.
4. Next I started laptop on the battery, went to BIOS and checked if the charger is recognized in the BIOS. No, it doesn't recognize charger. So, if it is not a charger then what else can it be?
5. Laptop doesn't have any strange smells so I'm not sure if anything happened with the motherboard, but I would assume mother board is ok because it works of the battery.
6. I was thinking updating the BIOS, but I can't, because it wont update whi... Read more

A:Dell Inspiron 17R 5720 doesn't work with charger. Charger is not recognized. Not charger problem.

Hi CJ777,
Thanks for reaching out with your query. You pretty much figured out all points of failure. Good job.
If the adapter is not detected in BIOS, it most likely is an issue with the mother board. In the BIOS set up, AC adapter should show up as 65w or 90w. If the adapter status is 'None' or 'Unknown Device Installed', it indicates that the mother board is not detecting the adapter for which the battery is not getting charged. Once the battery charge drains, I'm sure the adapter will not charge it again. Replacing the system board should resolve this issue.

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RELEVANCY SCORE 53.6

Hi, I bought this Ideapad 100s in April and have just recently started using it.  It works well when it is plugged in, but I can't use it when it is unplugged.  Every time it is switched on without the power, the screen flickers off and on, as though there is a loose connection between the main part of the computer and the monitor. Is it possible this could be something to do with power settings - since it only happens when it is unplugged - or does it sound like my computer is faulty? Thanks for any help you can provide.

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RELEVANCY SCORE 53.2

Hello, I have a 3 yr old Ideapad Z510(that came with Win8)which worked absolutely fine until recently. If I plug in the charger when the laptop is on, it abruptly turns off and would never boot again until I remove the charger. However, this is not how it behaves every time. There are some rare instances where I could still operate the machine with charger plugged in.  When turned off, battery is charging and also goes to full 100%. When turned on(battery mode) it does not drain rapidly - I could still get a fairly decent stand up time. So I am assuming the battery is good. I don't see any thermal issues either. Things I tried:-------------- > Tried with a different charger - no help.> Updated the firmware - no help.> Update the entire driver pack - no help.> Applied windows patches, reinstalled and also upgraded windows to Win 10 - no help.> Reseated the battery and associated cables - no help.  I am not sure if there is anything that I could do to at least diagonize the problem before I give it to the service station. Any pointers on this is much appreciated   Thanks much in advance.

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RELEVANCY SCORE 49.6

Hi guys, I have one offer for my Lenovo IdeaPad Y70 with one year use, it is a T450 (new one and 3 year warranty) and in my country I have few options for thinkpads and I really like those laptops, I dont need a powerful GPU. so should I keep my Y70 or go for T450? I am concerned about T450 screen and duo core i7U. I'll leave below the specs of each one. *sorry for my english. *Thinkpad T450 specs: Core I7 5600u, 8gb RAM, 1tb HD, screen HD+ (1600x900), W8pro *Lenovo Ideapad Y70 specs: i7-4720HQ, 16gb RAM, GTX 960M 4GB, 1 TB, FHD (1900x1080p).

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RELEVANCY SCORE 49.6

Hi guys, I have one offer for my Lenovo IdeaPad Y70 with one year use, it is a T450 (new one and 3 year warranty) and in my country I have few options for thinkpads and I really like those laptops, I dont need a powerful GPU. so should I keep my Y70 or go for T450? I am concerned about T450 screen and duo core i7U. I'll leave below the specs of each one. *sorry for my english. *Thinkpad T450 specs: Core I7 5600u, 8gb RAM, 1tb HD, screen HD+ (1600x900), W8pro *Lenovo Ideapad Y70 specs: i7-4720HQ, 16gb RAM, GTX 960M 4GB, 1 TB, FHD (1900x1080p).

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RELEVANCY SCORE 48.8

Looking for thin light 15 inch LED screen with above average battery life. Narrowed down to Lenovo due to customer support being superior to HP or Dell. Trying to keep weight below 6 pounds.

Tasks: word processing, web surfing, playback of movies.

Thinkpad SL510 may top 6 pounds - has faster processor and 7200rpm HDD. excellent price on sale, but that is not my primary criteria, since this is a gift.

IDeaPad U550 374955U has lower voltage processor, and 5400rpm HDD, and switchable graphics, which all in theory keep battery life longer. Not sure about the keyboard - how different is it from thinkpad?

anyone have an opinion on either of these, or another suggestion?
 

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RELEVANCY SCORE 48.4

I recently bought a Lenovo Thinkpad Active Pen, and got it today. I put it all together and realized that Thinkpad and my Ideapad Flex 4 are totally different comuters. I was wondering if it would still work or not. Should I return the pen and get a new one? If so, which type of pen should i get? Thanks!

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RELEVANCY SCORE 48.4

Everything connected to the dock station seems to work fine except for the external video, which is just not showing up. Used to work great under Win 8.1 but decided to upgrade to Win10 yesterday... ugh. I tried updating to the latest DisplayLink software/drivers and the tray icon says "No DisplayLink Devices Detected". Anyone have any tips?

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RELEVANCY SCORE 47.2

I've purchased probably close to a dozen ThinkPad's over the years, and I waited patiently to upgrade to the T540p.  I was glad to see that the trackpoint remained, it is one of my favorite things about ThinkPads.That said, I just can't get over the decision to not have seperate left/right mouse buttons on the touchpad.  I quite literally swear at it sometimes.   It is so incredibly frustrating to use without seperate buttons that I can only assume that Lenovo did not ask a single user what they thought of this change, and instead, created a touchpad-by-comittee. I use linux (Mint 16 on this laptop) and it took some tweaking to get the button areas right.  It's stil not great, and I've entirely turned of mouse movement with the touchpad because it's too sensitive (palm included, even with with palm detection turned on).  I don't want to hear that you "don't support linux" (frankly, I don't care, few companies do) -- that's not why I'm here.  I'm here because I thought you'd want to know that this is that last ThinkPad I'm going to buy, unless you bring back the independent mouse buttons.   So thanks, Lenovo, for years of making great products (up unti this year).  Hopefully you can resume making great products in the future.   But for now, you've lost a customer.

A:T540 Feedback

You're not alone.  The Trackpad is hideous.  One of the key reasons I'm holding on to my W530.  My 3840QM goes blow to blow with the 4900MQ so no need to downgrade to inferior hardware.





W530 | 3840QM | 32g @ 1.35v CL9 1986z | 512g 840 Pro | 1t HGST 7200 | FHD AUO v.4 | Quadro K2k | GOBI 5k | Centrino 6300

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RELEVANCY SCORE 47.2

I have a Lenovo T540 notebook. The wi-fi card is 2.4Ghz only.  Can I use a USB Wi-Fi Dongle Adapter in order to obtain 5G access? What brand/model of adapter is recommended  (ie: Linksys Dual-Band AC1200 Wireless USB 3.0 Adapter (WUSB6300))? Thanks for your help.

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RELEVANCY SCORE 47.2

Hi Alli have downloaded the latest drivers but still have an issueit can see all the wireless connections availble but i am unable to connect - It only displays "Can't connect"i just ran the scanning tools from the Lenovo Solution Center and it comes up with the following warning "WWF00F000-WL7A9L"regardless which wireless i try to connect to and does not connecti am running Winodows 8.1 enterpriseany help welcomethank you

























lenovo error.PNG ?64 KB

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RELEVANCY SCORE 46.8

hello , i purchased my laptop from 1month and found sim card slot under battery and put my internet sim card but nothing happen and no internet .  what is this proplem ? need driver for that and what is this slot and how i use it correctly ? also i face proplem with touchpad some times work well and in between became slow and move wrong direction and pause automaticly.  best regards,ahmed salama

A:sim card 3g driver t540 p

HiThis is one of the frequently asked questions here.So, what is the laptop MTM (Machine-Type-Model)? MTM starts with 20BE or 20BF for your laptop. MTM will allow to check out whether the wwan modem was factory preinstalled.Do you see wwan device in the Device Manager (Network Adapters category)? Are there any Unknown devices in the DM?

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RELEVANCY SCORE 46.8

I have a T540 running Windows 10. I have set the power options so that when I press the power button briefly, it turns off the screen display. However, when I do this, the screen is blanked just for a moment and then the Windows log-on splash screen appears. If I press the Fn button the desktop reappears, no need to log in again. But what I want is for the screen to stay blanked until I press a button. I don't want the Windows screen to appear unbidden. Is there a solution?

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RELEVANCY SCORE 46

I can find instructions for installing a custom image for the initial splash screen, but I have a machine that was previously owned by someone who put on a custom image.  All I want to do is take it off and revert it to the original one.  Any help would be appreciated.
 
Thanks in advance

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RELEVANCY SCORE 46

Am unable to see my E: drive on the machine.I was using this sometime back and all of a suddent it disapeared. I didnt find any help with device manager, where only my C:/ disk is available.Please help me for any possible cause and advice. Machine config:g thanks!

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RELEVANCY SCORE 46

What are my encryption options (hardware and software) for Thinkpad laptops specifically T540p and T560s models. We would prefer hardware encryption but open to ideas if there are better options. Thank you in advance for any input!

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RELEVANCY SCORE 45.2

When i connect charger to laptop the power button and charger light starts button white light blinking my laptop model inspiron n5010
I tried all the steps like removing the battery and unplugged the charger and holds the power button for 30 second and reconnect no change.

A:When i connect charger to laptop the power button and charger light starts blinking

Hi ZMR 1986,
Thank you for writing to Dell Community Forum.
* Are you able to boot into windows normally?
* Please try to boot into BIOS <F2> and check what is the status of the battery / adapter listed.
* Please update the BIOS to the latest available version from our Dell Support Site.
* Can we check with an alternate adapter?
Please private message us the service tag of the system along with your email id.
(Note: please don't mention the service tag or email id on the public forum as it contains your personal information).
Regards,DELL-Akshatha MSocial Media and Community Professional#IWork4Dell

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RELEVANCY SCORE 45.2

When I plug the charger in the message on the battery icon on the bottom toolbar reads as "73%, plugged in, not charging". Obviously the laptop is recognising the charger (i.e "plugged in") but it is not allowing the battery to charge.
I have installed every update on the computer and I have recently searched for any outstanding BIOS updates. The system seems to suggest there is a BIOS update to be installed yet when I try to install it the system says that it cannot detect a charger, and won't complete the update, or it won't complete the update without a charger plugged in in the first place. It's a no-win situation. The computer and charger are only 14 months old so this is very unsatisfactory. When I remove the battery the computer operates on AC power only, so again the charger is working, it simply won't charge the battery and therefore once the battery runs down to 0, which it will eventually, I will be limited to using AC power only.
If I restart the laptop with the charger plugged in it diverts me to a warning page saying that the charger is not recognised and I am given the option to go to the BIOS setup, go to diagnostics or to continue. If I choose "continue" it simply returns me to this warning page every time so the only way to power up the laptop is to do so with the AC charger out, and to then plug it in once the system has started so that the battery doesn't drain completely.
Please help.

A:Inspiron 15 5559 charger not charging battery (manufacturers charger being used)

An unrecognized AC adapter will not charge the battery.
First try a new OEM Dell adapter.  If that's also not recognized, replace the DC power jack:
www.parts-people.com/index.php
If neither the new adapter nor the DC jack solves the problem, you've got a bad charge circuit - replace the mainboard.

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RELEVANCY SCORE 44.8

For the 4th time, the T540 keyboard has about 7 of its keys stop working. The seven keys are usually on the right hand side and in a group, but could be in any row, and within 1 or 2 columns of each other. Pressing the key does nothing, not even the click in click mode. I am convinced this is not a software problem as I have tried all possible software remedies. I am sure it is due to the keyboard or connection itself. The Shift or Ctrl does not work for these keys either. First time this happened after a year of use, I lost 'P' and '0' among others, and I had to replace the keyboard. A year later on the new keyboard it happened again, but came back after two days. 3rd time was four months later, and I have lost '-', '=', '5', '6', delete, and others. I remapped these. Then again now I lost another bunch including '\', backspace, enter, and others. The original keyboard is a backlit keyboard FRU 04Y2387, ID# 48L16M, Parts # 0C44952, Model # KM BL-105US . Replacement keyboard also backlit and exact replacement. Short of replacing the keyboard, or resetting the keyboard connection and cleaning the contacts, (all tried) what is there to do? Is this a contact problem or keyboard problem? Has happened with two different keyboards. Is this a common problem? Any help will be of great assistance and will be greatly appreciated.

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