Table Of Contents - Lenovo Yoga A940 Hardware Maintenance Manual

Contents
About this manual . . . . . . . . . . . . iii
Chapter 1. Read this first: Important
safety information . . . . . . . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 1
Safety inspection guide . . . . . . . . . . . . . 3
Handling electrostatic discharge-sensitive
devices . . . . . . . . . . . . . . . . . . . 3
Grounding requirements . . . . . . . . . . . . 4
Safety notices . . . . . . . . . . . . . . . . 4
Chapter 2. Environment and
electrical input . . . . . . . . . . . . . . 7
Chapter 3. General Checkout . . . . . . 9
Chapter 4. Using the Setup Utility
program . . . . . . . . . . . . . . . . 11
Starting the Setup Utility program . . . . . . . .
Enabling or disabling a device . . . . . . . . .
Enabling or disabling the Automatic Power On
features . . . . . . . . . . . . . . . . . .
Using BIOS passwords . . . . . . . . . . . .
Setup Utility program password types . . . .
Password considerations . . . . . . . . .
Setting, changing, and deleting a password . .
Selecting a startup device . . . . . . . . . . .
Changing the startup device sequence
permanently . . . . . . . . . . . . . .
Selecting a temporary startup device. . . . .
Exiting the Setup Utility program . . . . . . . .
Chapter 5. Symptom-to-FRU
Index . . . . . . . . . . . . . . . . . . 15
Hard disk drive boot error . . . . . . . . . . .
Power Supply Problems . . . . . . . . . . .
POST error codes . . . . . . . . . . . . . .
Undetermined problems . . . . . . . . . . .
Chapter 6. Hardware locations . . . . 17
Overview . . . . . . . . . . . . . . . . .
Major FRUs and CRUs . . . . . . . . . . . .
Parts on the system boards . . . . . . . . . .
© Copyright Lenovo 2018
Chapter 7. Installing or replacing
hardware . . . . . . . . . . . . . . . . 25
Handling static-sensitive devices . . . . . . . .
Installing or replacing hardware
Replacing the computer display panel . . . .
Replacing the USB connector . . . . . . .
Replacing the function board shield . . . . .
Replacing the Wi-Fi card . . . . . . . . .
Replacing the function board . . . . . . . .
Replacing the touch board shield . . . . . .
Replacing the touch board . . . . . . . . .
Replacing the subwoofer . . . . . . . . .
Replacing the LED light bar . . . . . . . .
Replacing the panel cover . . . . . . . . .
Replacing the microphone module and the
camera module . . . . . . . . . . . . .
Replacing the mainframe . . . . . . . . .
Replacing the front bezel . . . . . . . . .
11 Replacing the memory module . . . . . . .
11 Replacing the SSD . . . . . . . . . . . .
Replacing the fan . . . . . . . . . . . .
11
Replacing the CMOS battery . . . . . . . .
11
Replacing the speakers . . . . . . . . . .
12
Replacing the housing top metal assembly . .
12
Replacing the fan duct . . . . . . . . . .
12
Replacing the thermal module . . . . . . .
12
Replacing the CPU . . . . . . . . . . . .
Replacing the HDD. . . . . . . . . . . .
13
Replacing the HDD SATA connector . . . . .
13
Replacing the system board . . . . . . . .
13
Replacing the power button board. . . . . .
Replacing the HDMI switch board . . . . . .
Replacing the wireless charger cover
Replacing the Bluetooth speaker board. . . .
15
Replacing the wireless charger LED board . .
15
Replacing the wireless charger module . . . .
16
Completing the parts replacement. . . . . .
16
Chapter 8. Additional Service
Information. . . . . . . . . . . . . . . 57
17
20
Trademarks . . . . . . . . . . . . . . . 1
23
25
. . . . . . . . 25
25
28
28
29
30
31
32
33
34
34
36
37
38
39
40
40
41
42
43
44
45
46
47
48
48
49
50
. . . . 51
51
52
53
55
i