07-15-2017 08:48 AM
07-17-2017 05:04 AM
Thanks for using the Lenovo forums.
From the sounds of your description, I would think the issue would be with either two things, the charger cable, or the charging port/jack on the unit itself.
As this is having trouble being recognised in the unit, it may be the indication to the problem.
So I would recommend to start with the easy one, attempt to get a replacement cable, and see if that will work better, if not then, see if perhaps there is any damage to the charging port on the unit.
Perhaps a pin is missing from it, something along the lines of this.
Hope this helps, let us know how you get on.
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07-17-2017 08:18 AM
I've actually tried a different cable. I've also used a DMM to measure the voltages going into the battery and out of and they are normal. At the cable plug into the motherboard it's 21V. Then about 19V going in to the battery and 11V coming out which seems normal?
Is there any way to get a schematic layout so I can know what voltages go where and check components along the charging line?
I'll check the connections again just to be sure.
07-18-2017 01:07 PM
Upon further inspection I found what I believe is the culprit. Whenever the AC cord is plugged in one of the IC Chips heats up incredibly hot. The chip is the 1275C TI 598 A202. It's located near the CMOS battery and the hard drive.
Does any one know how to find that chip?
09-18-2017 04:56 PM
09-18-2017 05:12 PM
Hey! So I ended up ordering the TI chips I stated to attempt the replacement but my friend remembered he bought it from CostCo and they have a two year warranty policy so he just got a refund instead.
I'm fairly confident that chip was part of/ or the main problem though. It was shorted out, and it makes sense based on it's purpose in DC circuits.
Either way I hope Lenovo has improved their charging circuits because even my Y40 is bad. I can't recommend this brand anymore :/
09-18-2017 05:53 PM
09-18-2017 06:55 PM
Hold off on buying those ones with the links you sent me. They aren't the chip I noticed is an issue. It's a 1275 C surface mount chip. I'll send a link..
It's location on the motherboard is just inward from the power button. About an inch just below the HDD. Pretty small.
09-18-2017 06:58 PM
Here's a link to the part spec sheet. It's the surface mount square one.
I have some that were sent to me from China that I'm never gonna use and I got for free. I could send you one in the mail since they are so tiny.
09-18-2017 07:50 PM - edited 09-18-2017 07:52 PM
That would be great. Thank you. Can you DM through Twitter, @MindFlareRetro, for address info and so I can reimburse you for postage?