Lenovo T490s Hardware Maintenance Manual

T490s and X390 Hardware Maintenance Manual

Note: Before using this information and the product it supports, be sure to read the general information under Appendix A 'Notices' on page 107.

Second Edition (April 2020)

© Copyright Lenovo 2020.

LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services Administration 'GSA' contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS35F-05925.

Contents

About	this	manual		.	. .	.	.		.		.	.		. .	. .	iii
Chapter 1.	Safety						information.				.	.	.		. 1		.
General safety	.	. .	.	.	.	.	.	.	.	.	.	.	.	.	.	1
Electrical safety	.	. .	.	.	.	.	.	.		.	.	.	.	. .	.	1
Safety inspection		guide.		.	.	.	.	.		.	.	.	.	. .	.	3
Handling devices that are sensitive to electrostatic discharge . . . . . . . . . . . . . . . . . 3
Grounding requirements			.	.	.	.	.	.	.	.	.	.	.	.	.	4
Safety notices (multilingual translations) . . . . . . 4
Chapter 2. Important service
information.	.	.	.	.	.	.	.	.	.	.	.	.	.	.		21
Strategy for replacing FRUs . . . . . . . . . . 21
Important notice		for					a
Strategy for replacing a solid-state drive . . . 21 replacing system
board . . .	. .	.	.	.		.	.	.	.	.	.	.	.	.		22
How to use error message . . . . . . . . . 22 Strategy for replacing FRUs for CTO, special-bid,
and standard models.					.									.		22
		.		.		.	.	.	.	.	.	.	.
Product definition . . . . . . . . . . . . 22 FRU identification . . . . . . . . . . . . 22 Chapter 3. General checkout . .
What to do first	.	.		.	.	.	.	.		.			.	.		25
.	Checkout guide .	. .	.	.	.		.	.	.	. .	.	. .	. .	. .		25 26
									.
	problems		.		.	.		.	.		.		.	.		26
Diagnosing				.		.	.			.	.	.
Quick test programs . . . . . . . . . . . 27 UEFI diagnostic program . . . . . . . . . 27 Bootable diagnostic programs . . . . . . . 27 system checkout . . . . . . . . . . 28
Checking the Checking the	ac	power				adapter					.	.	.		29
Power
charging . .	.	built-in .	.	.	. .	battery .	and .	.	. .	.	operational .	.	. .	. .		29	.
Checking the coin-cell battery . . . . . . .
Chapter 4. information.			.	.	.	.
29 Related service
. Recovery information		.	for .	the .	. .	.	. Windows .	.	. . .	10 .	.	. .	.	.	31 .	31	.
operating system . .
Using advanced				.		.	.	.		.	.	.	.	.	31
startup options . . . . . . . . 31 Recovering your operating system if Windows 10
fails to start .		.		.	.	.	.	.			.	.			32
Resetting your computer . . .
	.								.	.			.	.
		.
			.	recovery						.		.				.
Creating .	and using	a . .	.	. .	.	. .	.	USB .	drive	.	. . .		. . .	.		.	32 33
Passwords. . . Power-on	password	password		.	.	.	. .	. .	.			.	. .	. 33
Hard disk . . . .
													.	.	33
Supervisor password . . . . . . . . .
																		33
													.
						.

Table Caption: This table appears to be an index or table of contents for a technical manual, listing chapter titles, sub-sections, and corresponding page numbers.

How to remove the power-on password

How to remove the hard disk password.

Power management .

.

.

Sleep mode

.

.

.

Hibernation mode

.

Symptom-to-FRU index

Numeric error codes

Error messages .

.

Beep errors.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

No-beep symptoms

.

.

LCD-related symptoms .

Intermittent problems.

.

Undetermined problems

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

34

34

35

35

35

36

36

37

38

39

40

41

41

Chapter 5. Special keys . . . . . . . . 43

Chapter 6. Locations

.

.

. . . . . . . 47

Locating computer controls, connectors, and indicators

Front

Base

Left .

Right

.

.

.

.

.

Rear

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Bottom

.

.

.

.

.

.

Locating FRUs and CRUs .

Major FRUs and CRUs

LCD FRUs and CRUs.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Miscellaneous parts

.

.

.

Connector and cable guide

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Looking up FRU information .

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

47

47

48

49

49

50

51

51

52

58

60

60

63

Chapter 7. FRU replacement notices . . . . . . . . . . . . . . . . . 65

Screw notices

.

.

.

.

.

.

.

.

.

.

.

.

.

Retaining serial numbers

.

.

.

.

.

.

.

.

.

Restoring the serial number of the system unit .

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Retaining the UUID.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Reading or writing the ECA information .

.

.

.

.

.

.

.

65

66

66

66

67

Chapter 8. Removing or replacing a

FRU. . . . . . . . . . . . . . . . . . . 69

General guidelines.

.

.

.

.

.

Before servicing the computer

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Disabling the built-in battery

.

.

.

.

.

.

.

Removing the nano-SIM-card and microSD- card tray .

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

69

69

69

70

1010 Keyboard (for ThinkPad X390 only) . . .	. 70	1160 Smart card reader or dummy smart card
1020 Base cover assembly . . . . . . . .	. 72	reader . . . . . . . . . . . . . . . . . . 89
1030 M.2 solid-state drive, bracket, and thermal		1170 System board . . . . . . . . . . . . . 91
pad . . . . . . . . . . . . . . . . .	. 73	1180 Power-card cable and power card . . . . . 95
1040 Wireless WANcard . . . . . . . . .	. 75	1190 LCD unit . . . . . . . . . . . . . . . 96
1050 Docking-station-connector bracket . . .	. 76	1200 Keyboard assembly (for ThinkPad T490s) or Keyboard bezel assembly (for ThinkPad X390) . . . 98
1060 Thermal fan assembly . . . . . . . . 1070 USB-card cable and USB card. . . . .	. 76 . 77	2010 LCD bezel sheet and LCD bezel . . . . . . 98
1080 Built-in battery . . . . . . . . . . .	. 79	2020 LCD hinges . . . . . . . . . . . . . . 99
1090 Coin-cell battery . . . . . . . . . .	. 81	2030 LCD panel and LCD cable . . . . . . . . 100
1100 Trackpad cable. . . . . . . . . . .	. 81	2040 Camera and microphone module and aluminum foil (for ThinkPad T490s only) . . . . . 100
1110 Trackpad . . . . . . . . . . . . .	. 82 .	2050 Camera-and-microphone-module cable and
1120 NFC card . . . . . . . . . . . . . . . .	84 . 85	antenna kit . . . . . . . . . . . . . . . . . 101
1130 Speaker assembly . . . . . . 1140 Fingerprint-reader-and-smart-card-reader cable, fingerprint-reader cable, and smart-card-		2060 LCD cover assembly. . . . . . . . . . . 105 Appendix A. Notices. . . . . . . . . .107
reader cable (for ThinkPad T490s only) . . . . 1150 Fingerprint-reader bracket and fingerprint	. 87	.109
		Appendix B. Abbreviation table . . .

Table Caption: This table lists various computer components, their corresponding part numbers, and the page numbers where their removal or installation instructions can be found. It appears to be an index or table of contents for a hardware maintenance manual, likely for ThinkPad laptops.

reader

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

88

About this manual

This manual contains service and reference information for the following ThinkPad ® products:

**Table