Lenovo charger resistor18.11.2020
Has anyone found an adapter to convert a W Power adapter from a W big round connector to the W slim adapter? I've got several of the W W adapters lying around so was keen to reuse them, rather than having to lug around the new W adapter. It all fits together, but the W stays discharging and says the power adapter doesn't have enough power. I would suggest the convertor doesn't pass through the same resistance for the W to detect the W adapter.
I doubt you can solve this just electrically and mechanically, because of the logical protocol that may or not match. I have plenty of older PSU bricks that i can't use with the newer models Constipation cheap pun intended theory states: Vendors keep "innovating" new protection schemes --in stead of basic features and functions-- to make us buy their new and 'improved' sets of everything The new W w slim adapter has a resistance of ohms between the outer side and center pin.
The adapter I bought has a resistance of ohms. So looks like the Ws will be looking for something with resistance of ohms plugged in to it's power connector to detect a 'real' adapter. I must have missed this on the ThinkWiki PowerConnector page - 'cos a W W adapter is never going to provide the right 'signal' resistance. Is there a way to measure the data signal on the wire, if any?
Voltage Measured on a Fluke 73 III. I placed a lighted in line switch on the PSU to Mains cheater connector as a Workaround due to the lack of light on the brick. Now I just look at the switch to see if I have power ON, and use the switch to turn off the Main without having to unplug or use a switched multi socket rat nest. This is a "Bauden Safety" measure, to avoid over heating and potential of fire when left unattended or overnight.
I did not see a thermal switch or other safety user serviceable part on the brick. It claims UL and CE certification. A very well designed brick. It's simply a resistor between the center pin, and ground that tells the computer what type of PSU is being used. Yep, pulled my adapter cable apart.
At the slim-tip end there is a small ohm resistor between the center pin and outside ground. I cut it out and put in a ohm resistor. A bit of hit-sink wrap and tape I now have a big-barrel to slim-tip adaptor that shows all power-adapters as W adaptors. I also played around connecting the center pin at both ends of the adapter therefore passing through the 'resistance' this worked for the W adapters, but the W adapters were deemed not to have enough power for the W - so I 'locked' it in as a W adapter via the ohm resistor.
Can anyone with a genuine 0B confirm if the center pins are connected, passing through the resistance of the legacy charger?
View All.DIY How To Fix A Broken Laptop Charger "Adapter" HP-Lenovo- Dell -IBM
However, when I got my thinkpad P70, although it also uses around 25W in typical use, which means plenty of extra wattage on a 90W power supply to charge the battery, the P70 was unfortunately designed not to charge under any condition unless it recognizes a power supply that's at least W it ships with a W power supply, and it's a huge monster brick.
I'm pretty mad at lenovo for that because they could totally have designed the P70 to charge at a slower rate from a 90W power supply, or at least when the laptop is sleeping, but no, even when it's sleeping, it will just not charge at all. I guess in this case, it's not a huge issue since energy would be wasted trying to charge the laptop battery instead of just powering it, but still, that was disappointing.
See more images for Hacking a thinkpad slim tip adapter to output more than 90W required to charge a Thinkpad P The hard part was finding where the resistor was since I had to replace a small resistor with a bigger one the other way around, I could have trivially added a resistor in series.
After cutting the cable in 2, I convfirmed it was on the slimtip side, so I had to take the plug apart until I found it. After that, it was just a matter of adding a new resistor, and in the end, I added a resistor bridge, so that I could select no resistor, Ohm 90W1kOhm Wor even 1.
For my laptop, though W was enough, and my iGo only delivers W anyway. When my laptop is running, and the battery charging, it's now using 5. I'm not super happy at Lenovo for having stupidly designed their Thinkpad P70 not to charge from a 90W power supply under any use case, even at reduced speed, or even with the laptop sleeping or off, but since I already had the laptop, I was stuck with it, so this little resistor hack did the trick.
Hope this helps someone.The new standard for wired connectivity, USB Type-C, will charge your laptops and phones, transfer data and even send 4K video to your monitors.
If you check the inventory at popular retailers, you'll see scores of cables and adapters featuring the reversible connector, but unfortunately, some of them don't work well. On Feb. A bad cable can ruin a machine. With a 56K Ohm resistor and the right components on board, a standards-compliant cable will make sure that the client tries to draw only as much electricity as the host can provide. A poor-quality wire, however, fools the phone into thinking that it's connected to a 3-amp- capable power source.
When the phone tries to draw 3 amps, it can cause permanent damage. Leung fried both the USB ports and the host controller on his Pixel C laptop by attaching it to an iPad charger, using a faulty cable. Not only USB cables … whether it's some other cable for other technologies, if these cables aren't built correctly, they can cause issues. It's like buying a coffee maker that has an electrical plug that was not built to a standard, not passed through any regulatory review.
Leung is helpful. So are spreadsheets cobbled together by denizens of the Internet. But how can the average consumer pick the right cable before ruining his smartphone or laptop? A folded and stamped connector, North explained, is usually made of zinc tin alloy which is easily broken and may not handle the cable's power requirements.
Is it all their cables? But again, we don't know. We do know of this one cable. But those are some of the questions that also need to be asked. Consumers won't be able to tell by looking at a cable if it has the appropriate resistor or has been tested to be compliant with USB Type-C standards, but buying one that is certified by the USB-IF is a good start.
Rahman Ismail, CTO of the USB-IF, explained that their program, while not a replacement for local, state, federal or international regulation requirements, is still quite comprehensive.
Ismail believes the average compliance test takes several weeks, but that depends on the number of issues encountered and communication time between the test labs and the manufacturer. They have not had the chance to test the cable that Leung encountered, but Ismail believes from what he has read that not even the minimum tests were performed before shipping. The USB-IF has a number of logos that manufacturers can use if accessories pass compliance testing, but consumers may not see them or know about them.
They may be located on product packaging, but that's not always the case. Additionally, those logos are rarely if ever shown on popular online shopping sites like Amazon and Newegg, leaving customers guessing even when buying from the biggest online stores.
Ravencraft said the matter is being investigated. Laptop Mag reached out to Amazon and Newegg multiple times for comment. Neither company responded to these inquiries. The USB-IF can't police companies and force them to submit cables for standards testing; it isn't a regulatory agency. But consumers can look for certain telltale signs that cables will work with their devices.
It came with the wall charger and Type-C plug, and that all came from [Google]. I have a high level of confidence as a consumer that all of those things should work fine together because they came from a top-tier manufacturer. Ravencraft also urged consumers to buy based on brands they know and trust, rather than buying the cheapest one available.
He appreciates Leung and others who are testing cables so that others can do research online, but he can't vouch for their results. A representative said that it's updated often — every few weeks, at the most.I had T before, and I thought that if I buy converter from round to square tip, I could use old adapters with w I was quite naive:. I have seen a lot of topics about modding 90w power adapters, so w thinks that it's w adapter and it works ok.
Did anybody try anything similar with w power adapter? The W uses a W or W adapter for the i7 quad cores. The W W- models are not compatible with any other adapter, even though they can be run on a W adapter through a dock, albeit at a significantly decreased performance.
Trying to get it to run on a 90W adapter, modded or not is absolutely not recommended, as the machine tries to draw way more power than your adapter can provide, which could result in frying the adapter This issue has been discussed to death, some report success, some report anomalies.
It's wholly dependent on what you do with your machine, but the Lenovo engineers are not idiots and did not put in a requirement for a W adapter as a practical joke on it's owners, as many of these commenters in the following threads would have you believe. I have not experienced any trouble with the W or even the W modelsmyself, because I don't mess around with this to save a couple of hundred grams from my laptop bag.
But to me, plugging an inadequate power supply into a machine such as the W- series, and then to witness it starting to drain the battery to make up for the inadequacy of power being supplied, is not something I want to witness on my workstation. If a principle concern is portable weight, then possibly the top-spec'ed W-series are not the best choice, considering larger power adapter size and other variables.
Like everything, there are trade-offs. W requires W AC adapter. If you look at the other thread, my concern was actually the adequacy of W to power up the W I don't have any weight issue I came from a Dell M machine, which was far way heavier than the W! I agree with you that the workstation need a proper charger - and so, why do Lenovo doesn't produce the Ultra Dock with W option for Europe?!
ThinkPad 65W AC Adapter
This seems to me very strange! But I simply explained to our Lenovo partner here that this was for a W machine, and they supplied the correct adapter with it.
They use the same power input, unlike the barrel plugs for the earlier models. Using the laptop through a power meter I never saw it draw more than 30 watts and it averaged But that probably doesn't matter as much because most rotating drives are in the range when not idle. I can imagine that if I run it as a server so that I fully utilize the 8 available execution cores while running graphics that I am likely to encounter a problem. But running on a lightly loaded development system, why not?
The short answer is you need to replace the resistor in the round-to-square connector adaptor. This is pretty simple to do. The laptop looks at this resistor and by its value determines the power output, and may refuse to accept the charger. My old T accepted it, while my new W will not i73. Instead they use a ohm resistor to connect the centerpin to ground the outer body of the square connector.
The resistor is in the square connector. By installing your own ohm resistor in the adaptor, you make the charger appear like a W charger - you can trick the W to accept even a 65W charger will generally run the W only at its lowest speed of 0.Over time, different ThinkPads have used different power connectors.
You can use a higher Amperage rated power supply then your ThinkPad needs, as long as the physical connector is correct. But you should not use a lower Amperage power supply on a ThinkPad needing more Amperage. Doing so will overheat the power supply, and might cause issues such as screen flicker. All current Thinkpads require 20 Volt DC input.
The information found in this page is mostly correct. But the four-pin connector, in particular, is not thoroughly understood. This connector is discussed on forum. As these 4-pin PSUs are getting more rare and more expensive, a cheap solution if you don't have one is to adapt a universal V laptop PSU with a barrel connector.
This isn't ideal if you're relying on the Thinkpad for some critical old business application, but it's fine if you're just a tinkerer playing with an old one off eBay for example. Get an extension lead for your barrel connector - e. Discard the plug half. Get a "Mini JST" plug with flying leads, commonly used to power model helicopters etc. Wire the two together so that the red wire on the Mini JST is soldered to the centre contact wire on the barrel connector extension socket half.
ALWAYS double check the polarity when plugging in your custom modded connector, since it's possible to get it the wrong way round. An aftermarket plug converter is available, alone and in a set, which fits IBM's hexagonal inlet. It is not safe to use. In some ThinkPads specifically ES and - pins are connected to each other. This plug will make a short circuit in such a ThinkPad. Tested by kishy on forum. This connector resembles, but is slightly larger, than Mini-Din. This connector resembles "snap and lock" DC power connector.
This is a 2. Four AC adapters are commonly available: 35W 16V 2. Some of the 3. Option Marketing number 11J Power controller subsystem senses when power is connected, and measures resistance between central signal pin and ground.Discussion in ' Lenovo ' started by zseroAug 2, Log in or Sign up. ThinkPad adapter resistor values Discussion in ' Lenovo ' started by zseroAug 2, The findings are the following: 1. There is only 2 wires coming out from the adapter 2.
There are 3 connectors in the plug 3. The electricity is between the inner and the outer side connector on the circle 4. The inside pin is used to identify the adapter, by a simple resistor connected between the pin and the outside connector. So to identify what adapter is what, we need to measure the resistance values between the outside metal and the inner pin.
The W adapter has 1. What I would like to ask, if you have a ThinkPad adapter, could you measure the resistance between the inner pin and the outside of the circle? Well done! So it looks like getting 90W to work with W should be easy. You must log in or sign up to reply here. Show Ignored Content. Similar Threads - ThinkPad adapter resistor. Replies: 1 Views: ZaZ Mar 27, Michael MaddanMar 17,in forum: Networking and Wireless. Replies: 14 Views: 1, Michael Maddan Apr 6, at AM. Replies: 0 Views: Starlight5 Dec 20, Replies: 2 Views: 1, ZaZ Dec 4, Share This Page Tweet.
Your name or email address: Do you already have an account? No, create an account now. Yes, my password is: Forgot your password?Fault summary: GT is dead when on power from ac adapter or battery.
The battery had become completely discharged during the last usage Inference: Suspected failure of ac adapter. Testing: Checked pin voltages of ac adapter plug against figure on page 21 of Lenovo Measured voltage on the centre pin was 0V. However, the inner metal casing of plug had constant measured voltage of 20V nominal.
Current limiting resistor for battery charger?
Inference was that power supply was ok but centre pin had become disconnected from supply. Because plug is moulded to adapter body this required the purchase of new ac adapter complete. On receipt of new adapter, system still did not work. Measured centre pin voltage of new adapter at 0V. Therefore assumed notebook socket was damaging centre pin, maybe system board was affecting ac adapter or above documentation was incorrect.
Removed plug from ac adapter and measured resistance between adapter plug component parts as: Centre pin to inner metal casing open-circuit. Centre pin to outer metal casing ohms.
Inner Metal casing to outer metal casing open-circuit. The dc socket harness for the GT50 was replaced. Voltages measured at the 5 pins of the power connector to the system board, relative to the outer metal casing of the adapter plug 0V of dc supply were: 2 red both 20V2 black and 1 white All 0V. These values applied to both the original, allegedly 'failed' adapter and the new adapter. Required information, if possible and available: Any suggestions for solution to problem? Maybe its the system board What value should the voltages be at the power connector to the system board?
Details of the required voltages on the Notebook socket and its cable assembly 5 wires: 2 red, 2 black and 1 white Is there a ohm resistor moulded in the socket. If so, why? Should the centre pin really be 20V?
Lenovo Laptop Chargers
If not, the documentation is a serious red herring. Details of internal circuit wiring of the ac adapter plug which is moulded and cannot be disassembled including the possible ohm resistor.
Advise where I can obtain a circuit diagram of the GT and its connections so that I can solve the problem myself, if no help available. Thanks for any help. I think both of your AC adapters are working as designed; the maintenance manual does have a note that measurements may be different to that shown depending on model, or words to that effect.