12-11-2018 12:32 AM - last edited on 06-25-2019 01:10 PM by richk
I love my P52, even if it throttles the CPU a little too easy.
What I don't love is that is won't receive any charge with a 90W adapter or USB-C unless it's hibernated or turned off (and not always then either).
Previous models would give a message that it's not sufficient and use some battery to compensate, but now I have to drag a huge 170W adapter to meeting rooms at work, which are prewired with 90W which should give me more than enough hours on 90W plus battery to last all day.
Is there a good reason to not support these ways to charge?
Solved! Go to Solution.
01-10-2019 06:29 AM
Hello sveintore! Welcome to Community Forums.
What is the wattage of the AC adapter that came with your machine? Based on the product specifications, the machine's AC adapter is 170W slim tip AC adapter and USB-C doesn't support power delivery. You may refer to the specs here https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad%20P52/ThinkPad_P52_Platform_Specification....
01-17-2019 02:06 AM
01-17-2019 08:50 AM
I have been using W and P series since W520 (maybe w510?) and they wouldn't start without a large adapter connected. You could plug a 90w is after it was running and I believe there would be no protection against overloading the adapter (fire or overheating possibility) or damage to the laptop's internal power circuitry. If you need additional run time, I suggest carrying an extra battery.
01-30-2019 12:51 AM
06-25-2019 02:12 AM
06-25-2019 07:52 AM
Power connector is in the rear. 15-watt charger??? There is no such thing.
06-25-2019 09:43 AM
There isnt any charging port in rear of my p52 20LB model. Talked to support today and they told me it is the board that regulates or sensed the wattage that is faulty and that I need to send to the laptop to the repair depot for repair to fix this.
06-25-2019 01:07 PM - edited 06-25-2019 01:09 PM
The 20LB is a P52S which is an entirely different model. P52S has an ultra-low power (15-watt) CPU while the P52 uses a 45-watt H-series processor. The P52s does not have a slim-tip power port, but uses USB-C charging. The P52 and P52s have similar names, but they are very different electronically.
I am editing the subject of the thread so it makes sense.
06-25-2019 01:16 PM
I will try to answer the question assuming a P52s. Are you using some kind of adapter to convert to USB-C? I didn't think there were 90-watt USB-C power supplies and I know there are not 135W or 170W. As far as I can tell, your machine needs a 65-watt adapter. The USB-C power delivery spec is complicated and I have seen or heard of no conversion adapter that works. You need to use the otriginal charger that came with your machine or an identical.