Use A Golden Key U1 Tool To Flash-Write Key Id Information; Remove The Speakers; Remove The Lcd Module; Remove The Power Board - Lenovo Yoga Pro 9i Maintenance Manual

Power board cable

Use a Golden Key U1 tool to flash-write key id information

After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to
start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID
to the new system board.
The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb
drive. Go to http://support.lenovo.com/us/en/solutions/HT506954
and use a Golden Key U1 tool.

Remove the speakers

Make sure the following FRUs (CRUs) have been removed.
"Remove the lower case" on page 28
"Remove the battery pack" on page 29
"Remove the solid-state drive (SSD)" on page 30
"Remove the Type-C bracket" on page 31
"Remove the thermal module" on page 32
"Remove the power board" on page 33
"Remove the system board, I/O board cable, power board cable and DC-in cable" on page 35
Step 1. Remove eight screws and then remove the speakers.
Figure 23. Remove the speakers
Screw specifications
M1.6 x L2.5
Go to https://support.lenovo.com/partslookup
part:
Speakers

Remove the LCD module

Make sure the following FRUs (CRUs) have been removed.
for detailed instructions on how to create
Number of screws
8
to look up the Lenovo part number of the following replacement
.
Chapter 4 Removing a FRU or CRU
39