Lenovo ideapad 5 windows 11 update disable charging circuit?

[bogart219]

Going back to this post on page 4, it's the AE version from your latest pictures; now which one was the original?




It says
TPS65994
AE
TI 218G2
A9D8 G4

This one "AE" appears to be older, "218" maybe means year 2022, month 2 (february), maybe it's the original one after all?


--------------

The other one "blank line" says "338", maybe 2023 , month 3 (march) (newer)?, since you said you ordered the "AD" version from Digikey, this one is the AD...



Here's the link for the AE version, hopefully you can change your order
https://www.digikey.com/en/products/...erslr/14634219

Your right,I wrote down what I believe was the original TPS chip but didn't include the "AE " in the second line for some reason. I didn't order yet, so I will order now the one " AE version "you linked to. thanks!

[bogart219]

Ordered yesterday.

[bogart219]

Hello again my friend. I soldered on those two new mosfets and that new TPS chip and I'm back to my flashing usb meter. When I test voltages when I can find any, the multimeter flashes.
What is weird, one time I found a solid 20 volts to ground on pin 4 of the usb-c charging port. When I went back to check again 5 minutes later, the 20 volts was gone and the meter was flashing 1.9 volts. Go figure.



Here are the mosfets and TPS chip I put on. I know it looks like shit but I believe their making the right contact. I don't know what to do at this point,so disappointed

[m1ch43lzm]

PQ8302 looks a bit crooked, looks like it's shorting S-G
I also saw what looks like a wire (maybe a strand of solder wick) near a cap, and a solder blob
If that doesn't fix it i don't know what to do anymore
Always measure resistances before applying power
Measure again the resistances on the 4 MOSFETs S-D, S-G, D-G

[bogart219]

Hello. wouldn't you think that if something was shorting out, it would heat up? My thermal camera doesn't show anything. i' going to check what you suggested, then remove components one by one till I get that flashing to stop. BTw, I think that new TPS chip I ordered and put on is the same as the old one i ordered, It has AE on the second line.

[m1ch43lzm]

Hello. wouldn't you think that if something was shorting out, it would heat up? My thermal camera doesn't show anything. i' going to check what you suggested, then remove components one by one till I get that flashing to stop.

Not always, a short circuit from a power rail to GND may cause 2 things:
1. Trigger a protection, internal or external (as in, not turning on a MOSFET), in that case nothing will get hot
2. Something gets hot, if there's no short circuit protection on that rail

But if you short a signal line to GND, or a signal to other signal pin, nothing will get hot

BTw, I think that new TPS chip I ordered and put on is the same as the old one i ordered, It has AE on the second line.

Please review your past order details at Digikey
The AE should be the correct one for Alder Lake platform (12th gen Intel CPU, the one you have) according to schematics from other brands (Dell, Asus) and this forum post from TI
https://e2e.ti.com/support/interface...t4-host-design

Our device recommended for Intel Alder Lake is TPS64994AE and later. TPS65994AD will support upto Intel Tiget Lake. Both are USB4/TBT4 capable.

AD is for Tiger Lake platform (11th gen Intel CPU)