Help please..Lenovo ideapad 5 14itl05 power and charging problem

[Dr.d]

Thanks for all the great information mon2! The board has been out for all my testing. I just plugged it in and tested....it now powers up on both sides of the usb c! I'm not sure yet if the other problem may be fixed as well. That being it operating and charging with both the battery connected and usb power adapter at the same time. I probably need to reassemble and test for that to see if its fixed too. But, its great to see this working now. So, what do you think I should do going forward? You think to risky to leave off and reassemble and send back to the customer. Or should I try and locate the replacement part? Maybe it's not even available. I haven't checked ebay or Digikey yet.

[mon2]

Good job! See attached. This ESD device is a SOT23-6 package.



Here is a part that is suitable and will be a drop-in replacement for the above defective ESD suppressor:

TPD4E001DBVR Texas Instruments | Circuit Protection | DigiKey

While the board does not require the use of these parts, they are recommended. Transients from the 'outside world' of the logic board, are very common and can nuke this board again. Without such a component, the logic IC(s) will receive the spikes. Becomes much more expensive to repair if that should happen.

[Dr.d]

Thanks so much mon2 ! You've been a Godsend, thanks for all the help. I'll let you know any updates and how it goes from here.

[Dr.d]

Hello mon2....Hey, I just want to let you know that I did order the part from the link you sent me. Thank you! I got it in and installed it, Re assembled the laptop and tested it. Everything works now! Evidently that part was also causing issues with the battery and adapter. That being the adapter wasn't charging the battery either. Thanks again!!

[mon2]

Excellent work! Thanks for the updates. It is appreciated by all. One less unit for the landfill.

[alterr333]

Yes, see attached.

Mon2 master by chance could yoou upload the brd for this machine???

Got one yesterday, signs of humidity in PUZ1 resoldered, but no joy, machine negotiates 20v, but onle 5v alw on, 3v3 alw missing

[mon2]

If any power rail is missing -> remove all power -> meter in resistance mode -> measure the resistance to ground. Need to confirm that there is no low resistane on that rail which can cause an excessive current draw -> will power down the rail.

So start with the 3v3 ALW rail and also confirm that the rail is being ENABLED. Measure the voltage to ground of the ENABLE pin for that rail.

[alterr333]

If any power rail is missing -> remove all power -> meter in resistance mode -> measure the resistance to ground. Need to confirm that there is no low resistane on that rail which can cause an excessive current draw -> will power down the rail.

So start with the 3v3 ALW rail and also confirm that the rail is being ENABLED. Measure the voltage to ground of the ENABLE pin for that rail.

i managed to fix this laptop by resoldering MP2940AGRT , then machine started to act different, i had a 3amp current draw spike, wich led me to QQ ic, SY8386BRHC, PU301, using the thermal cam, saw where the spike came from, rising temp to 60 degrees instantly, so lucky enough had a few new ones QQ to swap, so i did, tested and machine is up and runing again. charges and its ready to go back home, thanks man, best regards from the mayan riviera

[mon2]

Great update. Thanks.

See attached for the ESD array @ DT8

DT8 = CESD2510UC3V3U

Datasheet:
2009171509_CREATEK-CESD2510UC3V3U_C575940.pdf (lcsc.com)

This is a very common footprint ESD protection device available from assorted vendors including Texas Instruments / SOCAY, etc.

laptop freezes, usb 2.0 not working, usb 3.0 working - Badcaps
* see my post # 10 for details on other parts that can replace this one

[nebbia88]

just chiming in to say I had a similar fault, no power at all from the charger. DT16 was shorted gnd to vdd , DT1 had no apparent issues but removing both was needed. ill order some new ones but in the mean time its back to life.

this was caused by a dead DELL charger. one "flash" on the charging led as soon as i plugged in and no more charging since.

somehow using a powerbank which only gave 20W at 12V allowed it to charge slowly? althought only when laptopt was OFF.

Its like it didnt need to communicate , really confusing stuff.

[mon2]

Thanks for your feedback. It is nasty how a simple low cost device can cause the logic board to fail. As noted, there are assorted crosses for this part from various manufacturers. You can probably source through Digikey / Mouser / Arrow, etc. in addition to Aliexpress.