Lenovo Thinkpad Yoga X1 Gen 6 no charging

[Andreasbest]

Hello.
I received a yoga 6th gen ( nm-d341 ) that is not charging, tried both charging and thuderbolt ports but no charge, i don't see any physical damage on them, in fact they look like new.
When i use charged battery works great, i updated to latest bios as i saw a warning from lenovo regarding urgent update to fix charge problems and also updated ME firmware, no luck.
What do you suggest?

schematics and boardview: https://www.badcaps.net/forum/troubl...tic#post102868

Thank you in advance!

[mcplslg123]

Someone with 1000+ posts and still no measurements shared?

[Andreasbest]

I never managed to understand schematics reading. i'm going with boardview, just tell me what to measure.

[pc_okay]

Hello,

Check Vsys18 voltage first without battery.

[rediii]

Hello.
I received a yoga 6th gen ( nm-d341 ) that is not charging, tried both charging and thuderbolt ports but no charge, i don't see any physical damage on them, in fact they look like new.
When i use charged battery works great, i updated to latest bios as i saw a warning from lenovo regarding urgent update to fix charge problems and also updated ME firmware, no luck.
What do you suggest?

schematics and boardview: https://www.badcaps.net/forum/troubl...tic#post102868

Thank you in advance!

also check this:

https://www.badcaps.net/forum/troubl...6-series-fault

[Andreasbest]

I managed to get some bench time today.
The motherboard has no visible burned components neither heat indication.
I measure 3.3v on C9718 and 5v on F43.
I check on F7 for vsys18 but nothing there too.
What do you think?

update:tried to measure Q263 and just desolder like it was never soldered. The contacts underneath seem dirty, i'll try to clen them and resolder it.
update #2: after i solder back Q623 with fresh solder, flux and low velocity hot air i get many 3.3v and 5v voltages but still no power up with charger.
update #3: when i connected the battery i saw power and charge, all working now.

[Andreasbest]

Repair complete.
As stated on another thread the problem is on these 2 components, they get extremely hot and solder breaks.

[mon2]

Thanks Andreasbest for your update. The LGA packaging was just a horrible idea by someone. Can only imagine how many units of the same are tossed away from the same fault.

[mcplslg123]

Sourcing them is not easy in every location and are expensive as well.

[Andreasbest]

Thanks Andreasbest for your update. The LGA packaging was just a horrible idea by someone. Can only imagine how many units of the same are tossed away from the same fault.

They told me that gen 2 T14x have also the same fault, we will have a lot of work the next years with these components.
Warranties just expired.

[rediii]

good to know, so i was right. keep in mind, that you might cool them with a thick thermal pad.

[Andreasbest]

good to know, so i was right. keep in mind, that you might cool them with a thick thermal pad.

I thought about it too but there is no metal over them to absorb the heat.
One idea was to buy thermal glue and put a small piece of copper in top of them.
I'll try, there is no other way to cool them.

[rediii]

I thought about it too but there is no metal over them to absorb the heat.
One idea was to buy thermal glue and put a small piece of copper in top of them.
I'll try, there is no other way to cool them.

that's a good idea, too.

[Cavallonzio]

Hi, does anyone know the value for the capacitor above q263? it's blown on my laptop but i dont know the value to use to replace it

[mon2]

Is it C3037?

[Cavallonzio]

Is it C3037?

exactly, so I need to replace it with a 10 μF 25V capacitor, am I right?

[pc_okay]

Yes With 0603 physical size.

[Cavallonzio]

I've replaced C3037, but it still doesn't boot. I can charge the batter (my smart plug reports 60W drawn) the amber light turns on when plugged in, but it just doesn't boot, no fan spinning, nothing. What can I check on the board?

[Andreasbest]

Have you tried RTC reset?
Remove all power sources: charger, main battery and rtc battery and hold power button for 30 secs, then connect charger and see if powers on.