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System Board Replacement Fru
Have a Lenovo ThinkPad T420 (4177QKU) that has a bad system board. I would like to know the proper r...
Have a Lenovo ThinkPad T420 (4177QKU) that has a bad system board. I would like to know the proper r...
(Posted by jgscott 8 years ago)
Popular Lenovo 4177QKU Manual Pages
User Manual - Page 3
... to do first 28 Checkout guide 29
Diagnostics using Recovery Disc Set 39 Passwords 40
Power-on password 40 Hard-disk password 40 Supervisor password 41 How to -FRU index 45 Numeric error codes 45 Error messages 47 Beep symptoms 48 No-beep symptoms 48 LCD-related symptoms 49 Intermittent problems 50 Undetermined problems 50
Chapter 5. Related service information 39
Restoring the...
User Manual - Page 29
... that the latest UEFI BIOS is loaded to contact the Customer Support Center at 800-565-3344 for the Lenovo® authorized service technicians are customer-installable. The UEFI BIOS and device drivers are instructed to use error message" on page 24 • "Strategy for replacing FRUs for replacing a hard disk drive" on the screen. 3. After a system board is...
User Manual - Page 31
... the primary source for identifying FRU part numbers and FRU descriptions for the key commodities
for CTO, CMV and GAV products at the following Web site: http://www.lenovo.com/support/site.wss/document.do?lndocid=LOOK-WARNTY Select Warranty lookup.
Chapter 2. Custom Model Variant (CMV) This is a standard model (fixed configuration).
Also, PEW, eSupport, and...
User Manual - Page 32
... list of service parts by Category" select Service parts. Under "View by Date" select System service parts. Under "Filter by description, with your system. The list of FRUs, type in the eSupport record under Quick path. • Authorized IBM Business Partners can access Eclaim at the MT Model level.
26 ThinkPad T420 and T420i Hardware Maintenance Manual The key...
User Manual - Page 33
If the error does not recur, do with another FRU of the machine and the FRU part number are servicing sequence might not apply to do first" on page 28 • "Checkout guide" on page 31 - Consider replacing a FRU only when a problem recurs. General checkout
This chapter presents following important notes. "Lenovo ThinkVantage Toolbox" on page 29
- Important notes...
User Manual - Page 34
... type, model number, and serial number 9. Date on the display, and beep symptoms 6. Following is covered under the warranty by the customer.
Failing FRU name and part number 8. Before checking problems with multiple labels • Damaged or bent diskette eject button • Fuses blown by attachment of a nonsupported device • Forgotten computer password (making...
User Manual - Page 36
Follow the instructions on the screen.
A pull-down for DOS.
• To test Digital Signature Chip, the security chip must be set to Active.
10.
otherwise, it cannot be held down menu appears. (Its exact form depends on the model.)
Note: PC-Doctor menu does not mean the formal support device list. To exit the...
User Manual - Page 45
..., no product recovery program is replaced because of the user instructions and the following procedure: a. Notes:
• You must use an external USB DVD drive.
• During the recovery process, all recovery disc sets come with the pre-installed software when they will be posted on the computer. Related service information
This chapter presents following...
User Manual - Page 47
...be replaced for a scheduled fee. Remove the backup battery. When the ThinkPad logo comes up , immediately press F1 to reset the password. Select Power-On Password. 6. In the Changes have forgotten, do the following :
(A) If no SVP has been set: 1. Select Password. 5. Turn on page 65. 3. Press F10; If no service procedure to enter ThinkPad Setup. Supervisor password
A supervisor...
User Manual - Page 51
... CRS2 setting in the EEPROM is displayed for each error detected in the ThinkPad Notebooks, see the manual for that device. Enter BIOS Setup and load Setup defaults.-The checksum of the supervisor password in the EEPROM is failed.
0188 Invalid RFID Serialization Information Area. Battery pack. If replacing a FRU does not solve the problem, put the original part back...
User Manual - Page 54
.... If a mini-PCI Ethernet card is installed, confirm that every connector is disabled. DIMM. 2.
System board
No-beep symptoms
Table 5.
Type the password and press Enter.
48 ThinkPad T420 and T420i Hardware Maintenance Manual One long and two short beeps, and a blank or unreadable LCD.
1.
Two short beeps with error codes. DIMM.
Reinstall the operating system...
User Manual - Page 56
... devices b. Hard disk drive f. If the problem remains, replace the following FRUs one at a time until you find the failing FRU. 7. LCD assembly
50 ThinkPad T420 and T420i Hardware Maintenance Manual Intermittent problems
Intermittent system hang problems can be considered only when a problem recurs. Remove or disconnect all attached devices are installed, or if the system simply is...
User Manual - Page 70
... the slot firmly.
2 1
64 ThinkPad T420 and T420i Hardware Maintenance Manual To remove the SIM card, you need to remove the battery pack first. (See "1010 Battery pack" on page 65.) After you finish the servicing, make sure that the customer has installed. Before servicing ThinkPad T420 and T420i
Some models of the ThinkPad T420 and T420i you...
User Manual - Page 80
Table 15. If the computer you are servicing is a wireless WAN-ready model and does not have a wireless WAN card, route the antenna cables and secure them with a tape as shown in the following figure.
74 ThinkPad T420 and T420i Hardware Maintenance Manual Removal steps of PCI Express Mini Card for wireless WAN (continued) 3
Note...
User Manual - Page 139
... types or models, unless specific types or models are concealed by more than two screws. Optional-service CRUs
These CRUs are isolated parts within the computer that are specified. • FRU with specific models listed and described as xxU (where U is an example of these models, unless specific country or region designator is specified. • A CRU (customer replaceable unit) is...
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