Lenovo Yoga C740-15IML 5V on usb meter.

[Ryan Wurtz]

Hello. So I searched and didn't find any posts on this specific problem.

When plugged in USB power meter reads 5v
Doesn't charge battery. I can charge the battery with power supply. So it seems the battery works fine. Laptop started but didn't post on battery.

Original mobo had a shorted cpu it seems.

So I decided I need a new motherboard.
Put the new one in the computer. Connect the battery, I think it starts, don't quite remember, but when I plug the adapter/charger.

5v on the meter. Still won't charge. Can still charge the battery manually.
Everything on the laptop works a ok but won't charge.

Seller on eBay is wanting me to take it too a repair shop to get a quote on fixing it. I'm not sure what to do, I ordered a working board, I didn't get a working board. He says it was all tested working normal before sending out.

Sorry about the long post.
I will probably take it too the shop and see if they'll even try, An go from there.



Tldr:

Two boards both 5v on the meter
Old board dead
New board supposed to be working but also doesn't charge battery due to 5v on usb c?


What do you guys think the problem is? Bad pd controller? What are the first steps to diagnosing this. Thank you.

[mon2]

Return the lemon but initiate the return through the eBay portal only. The transaction must be logged by the eBay protection policy and not friendly chats from the vendor who is not to be trusted. Often eBay will refund the purchase price and let you keep the item.

[Ryan Wurtz]

Thanks for the reply. I was leaning towards that but the seller had me questioning if it could be my battery or something. I think I will open a return. I just don't want to be stuck paying return shipping or some nonsense.

[mon2]

EBay will force the vendor to pay for shipping unless the item was sold without a warranty and ‘as-is’ condition.

[Ryan Wurtz]

The seller accepted the return.
On his return info he stated the value at 15usd, originally I payed 180cad.

Is this just to avoid duties? Or will this possibly come back at me in some way?

[mon2]

It is an attempt to circumvent the orange man's tariff schemes. China and almost everyone else is all over this - fake the invoices. He has to pay import tariffs on this return. Ebay will compensate you for the paid invoice price. Be sure to work only through their chat / return methods. Keep tracking proof and pics of everything you are returning.

[Ryan Wurtz]

It is an attempt to circumvent the orange man's tariff schemes. China and almost everyone else is all over this - fake the invoices. He has to pay import tariffs on this return. Ebay will compensate you for the paid invoice price. Be sure to work only through their chat / return methods. Keep tracking proof and pics of everything you are returning.

hey mon2, so i returned the faulty board. all good. went to a different seller (All seems like the same company or something, the listing descriptions for the boards are all similar or the same.)
purchased a new board, arrived today.

plugged in the battery, plugged in the charger, still 5v. powers on and posts all fine an dandy with the battery plugged.
but when i try to power on with just the charger, it pulls 1 or 2 amps at 5v for a second and shuts off.
charger works fine on other laptops, its a genuine lenovo 65w usb c charger.

Am i really unlucky or are these sellers selling faulty boards?
EDIT: listing says the condition is new, but the foil on the back sure looks like its been used an took off a few times.

Does anybody have a Lenovo Yoga C740-15IML 81TD Laptop, does it negotiate 19v without a main battery plugged?