Hello friend, how were you able to solve the problem of the Lenovo Yoga with CYPD4226 chip, mine was also short circuited, and I bridged the 3.3v rail to pin 9 of u38/u227, to enable the CCG4_VBUS_C_CTRL_P1, CCG4_VBUS_C_CTRL_P2 signal, I also tried the common type C charger but it gives me an error code message and the firmware cannot be updated, could you help me explain in a better way how you solved it, I will wait for your response, thank you.

Greetings.​

Re: Lenovo yoga c930 NM-B741 Doesn't boot or charge USB type-C controller issue.


Damn. As usual half-ass reading the topic. Mine is actually 920-13IKB, [B]not[/B] C930, that's why it has been so easy.
Original charger is not detected by system, and flasher requires it to be detected to start a flashing.
Thats why i was telling about regular 5V charger, it detects.

You probably actually need those jumpers.
Only thing i can suggest is to check pin 10 XRES. It is external reset of CYPD from multicontroller U17(IT8227).
If i'm not half-assing...

Re: Lenovo yoga c930 NM-B741 Doesn't boot or charge USB type-C controller issue.


IDK
Try clean Windows install.
Did you remove jumpers from pin 9 that you soldered?
Maybe faulty IC, buy another one.

P.S.
Succesful update log looks like this

[CODE]Bootloader is active. Proceeding to update firmware image #1
Reading Silicon ID..
Trying to enable flashing on CCGx device..
Clearing the metadata rows..
Updating flash row 20...
Updating flash row 21...
Updating flash row 22......

Re: Lenovo yoga c930 NM-B741 Doesn't boot or charge USB type-C controller issue.


I did not jumped nothing.
[B]Do NOT use original charger.[/B]Just use some dumb type C cable and charger [B]WITHOUT[/B] POWER DELIVERY SUPPORT.
It should charge from 5v just fine, when battery is above 60%, it will allow you to flash firmware.






You do not need to flash BIOS, you need flash [B]firmware to new CYPD4226 chip that you soldered[/B]. It listed at lenovo website as Type C Firmware for Windows 10 (64-bit) - Yoga 920-13IKB, Yoga...

Re: Lenovo yoga c930 NM-B741 Doesn't boot or charge USB type-C controller issue.


yes...

Re: Lenovo yoga c930 NM-B741 Doesn't boot or charge USB type-C controller issue.

Same thing here. Replaced cypd4226. Original USB-PD charger does not detects, used regular 5v 3a NON USB-PD charger. Succesflully charged it above 60% and flashed CYPD4226 firmware.