Lenovo T430U manual Intermittent problems, Undetermined problems, Reseat the LCD connectors

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If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.

Notes:

•This policy applies to all ThinkPad notebook computers purchased on 1 January, 2008 or later.

•Lenovo will not provide replacement if the LCD is within specification as we cannot guarantee that any replacement LCD will have zero pixel defects.

•One pixel consists of R, G, B sub-pixels.

Table 5. LCD-related symptoms

Symptom or error

FRU or action, in sequence

 

 

No beep, power-on indicator on, and a blank LCD during

System board.

POST.

 

 

 

 

 

• LCD backlight not working.

1.

Reseat the LCD connectors.

•

LCD too dark.

2.

LCD assembly.

• LCD brightness cannot be adjusted.

3.

System board.

• LCD contrast cannot be adjusted.

 

 

 

 

 

 

•

LCD screen unreadable.

1.

See important note for “LCD-related symptoms.”

•

Characters missing pixels.

2.

Reseat all LCD connectors.

•

Screen abnormal.

3.

LCD assembly.

•

Wrong color displayed.

4.

System board.

 

 

Horizontal or vertical lines displayed on LCD.

LCD assembly.

 

 

 

 

Intermittent problems

Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a problem recurs.

Undetermined problems

If the diagnostic tests did not identify the device that has failed, if wrong devices are installed, or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate FRUs that have no defects).

Verify that all attached devices are supported by the computer.

Verify that the power supply being used at the time of the failure is operating correctly. (See “Power system checkout” on page 28)

1.Turn off the computer.

2.Visually check each FRU for damage. Replace any damaged FRU.

3.Remove or disconnect all of the following devices:

a.Non-ThinkPad devices

b.Printer, mouse, and other external devices

c.Hard disk drive

d.External diskette drive or optical drive

e.memory module on the left memory slot, if there is one

f.PC Cards

4.Turn on the computer.

5.Determine whether the problem has been solved.

6.If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.

7.If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU):

38Hardware Maintenance Manual

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Contents Hardware Maintenance Manual ThinkPad T430uFirst Edition August Copyright Lenovo Contents Appendix A. Notices Iii About this manualThinkPad T430u Iv Hardware Maintenance Manual Safety information General safetyElectrical safety Safety inspection guide Safety notices multilingual translations Grounding requirementsSafety information Hardware Maintenance Manual Safety information Perigo Perigo Vorsicht Vorsicht Vorsicht Safety information Hardware Maintenance Manual Safety information Hardware Maintenance Manual Safety information Hardware Maintenance Manual Safety information Hardware Maintenance Manual Important service information Before replacing partsStrategy for replacing FRUs Select Drivers & SoftwareHow to use error message Dynamic Configure To Order CTOStrategy for replacing a hard disk drive Important notice for replacing a system boardUsing PEW Click Warranty Click Check Warranty StatusFRU identification for CTO, CMV, and GAV products Custom Model Variant CMVHardware Maintenance Manual What to do first Following are not covered under warrantyGeneral checkout Quick test programs Lenovo Solution CenterCheckout guide Uefi diagnostic program Bootable diagnostic programsClick Lenovo Bootable Diagnostics Tests ToolsPower system checkout Checking the ac power adapterChecking the battery pack Checking the backup batteryWire Voltage V dc Checking operational chargingHardware Maintenance Manual Related service information Restoring the factory contents by using Recovery Disc SetHard-disk password PasswordsPower-on password Supervisor password How to remove the power-on passwordHow to remove the hard-disk password Select Power-On PasswordPower management Screen blank modeSleep mode Select Master HDP Hibernation mode Symptom-to-FRU indexNumeric error codes Error messages No-beep symptomsBeep symptoms LCD-related symptomsIntermittent problems Undetermined problemsReseat the LCD connectors See important note for LCD-related symptomsSystem board LCD assembly Hardware Maintenance Manual Status indicators Indicator MeaningHibernation, or normal mode Function key combinations Key combinations DescriptionHardware Maintenance Manual Front view Locating computer controls, connectors, and indicatorsLocations Locating FRUs and CRUs Rear viewBottom view CRU statement for customers Major FRUs and CRUs Description Self-service CRU Optional-service CRULCD FRUs and CRUs Looking up FRU information Antenna kit LCD cableHardware Maintenance Manual FRU replacement notices Screw noticesPlastic to plastic Logic card to plasticMTM on rear label Retaining serial numbersRestoring the serial number of the system unit Product ID on rear label Retaining the UuidReading or writing the ECA information Hardware Maintenance Manual Removing or replacing a FRU General guidelinesDisabling the battery pack in the Uefi Bios Before servicing the computerRemoving the SIM card Bottom coverRemoving or replacing a FRU Battery pack Important notices for replacing a battery packHard disk drive or solid-state drive assembly Step Screw quantity Color TorqueStep Screw quantity Color Torque Keyboard Removal steps of keyboardStep Screw quantity Color Torque When installing Memory module Removal steps of memory modulePCI Express Mini Card for wireless LAN Removal steps of PCI Express Mini Card for wireless LANRemoval steps of PCI Express Mini Card for wireless WAN Removal steps of PCI Express Half Mini Card for wireless WAN Removal steps of mSATA solid-state drive Backup battery Keyboard bezel Removal steps of keyboard bezelStep Screw quantity Color Torque Hardware Maintenance Manual Speaker assembly Removal steps of speaker assemblyMedia card reader Removal steps of media card readerFingerprint reader Removal steps of fingerprint readerPower button sub card Removal steps of power button sub cardSystem board assembly and thermal fan assembly Hard disk drive or solid-state drive cableRemoval steps of hard disk drive or solid-state drive cable Important notices for handling the system boardRemoval steps of thermal fan assembly When installing DC-in sub card and base cover assembly Removal steps of system boardApplying labels to the base cover assembly Removal steps of DC-in sub cardLCD unit Removal steps of LCD unit M2.5 × 6.5 mm, wafer-head, nylon-coated Black 392 Nm Kgf-cm LCD bezel LCD panelRemoval steps of LCD bezel Removal steps of LCD panelIntegrated camera and microphone combo card Removal steps of integrated camera and microphone combo cardHinges Removal steps of hingesWireless antenna cables and LCD rear cover assembly Removing or replacing a FRU Hardware Maintenance Manual Appendix A. Notices Electronic emissions notices Trademarks1P0B48901
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