![]() ![]() I did this because it was a suggestion from Dell as a possible solution. The amount of battery charge was still 5% which it was prior to all that. Hello Bree & Callender, This morning I fiddled around trying to get the charger to work in the boot process by pressing F2 and the waiting for 10 minutes or so before continuing to log on. I have had a go at uninstalling the two drivers under the battery heading in Device Manager but this has not solved the problem and so I will investigate the possibility of installing different drivers to see if that helps. On this point it just appears to me that the power supply, which should be the simplest part of the PC has been over complicated but then, as I indicated earlier, I have no in depth knowledge about the working of PCs. I wonder if there is any way of testing if the wire to the central pin is faulty? I had not realised that the central pin is a data line and not a power current conductor and I now understand why, if the connection to it is broken, the adapter and power wiring can still be working but not charging the battery. The adapter is showing as unknown however at F2. The adapter is a Dell and the current output puts its capacity at well over 65 watts. The Dell seemed to be working fine until a few days ago when I spotted the battery icon not showing a full charge and warning about it being plugged in and not charging. The Dell came with Windows 7 Ultimate (32 Bit) Ultimate and because I get pleasure out of interfering with things I know very little about I spent time and nervous energy doing a free upgrade to Windows 10 Pro. I bought it just a few weeks ago when my other laptop, an Acer, had to go back to Acer where they changed the motherboard under warranty. ![]() My Dell laptop, model Latitude E5420, is also 2nd hand. Thank you for the two very interesting responses to my question. Note that not all universal replacement adapters will have the required 'centre pin' signal. ![]() If it can't (or the adapter is below the power output this PC requires) then it will still power the PC but will not charge the battery. The Power/Battery section of the bios should tell you the power output of the adapter if the adapter is being recognised, or show 'unknown adapter' if it is not.Ī Dell will only charge its battery when it can identify the power output of the adapter. You can confirm that the PC cannot identify the charger by using F2 at start up and going into the bios. I suspect either your adapter has developed a fault, the wire to the centre pin has broken in the plug (maybe by tripping over the wire and yanking it out of the socket?) or the socket on the PC is damaged. The laptop will then refuse charging if the adapter does not meet requirements. Genuine Dell laptop power supplies use the 1-Wire protocol to send data via the third wire to the laptop (about power, current and voltage ratings). ![]()
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