Lenovo 33472YU, S230U manual LCD-related symptoms, Intermittent problems, Undetermined problems

Page 45

Table 5. Beep symptoms (continued)

Problem

Solution

 

 

Five short beeps

The system board has a problem. Have the computer

 

serviced.

 

 

Five short beeps, pause, five short beeps, and pause

Continue to boot immediately when the error was

 

detected.

 

 

LCD-related symptoms

Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns.

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 6. 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)

Chapter 4. Related service information 39

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Contents ThinkPad S230u Hardware Maintenance ManualFirst Edition September Copyright Lenovo Contents Appendix A. Notices Iii About this manualIv Hardware Maintenance Manual General safety Safety informationElectrical safety Safety inspection guide Grounding requirements Safety notices multilingual translationsSafety 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 Before replacing parts Important service informationStrategy for replacing FRUs Select Drivers & SoftwareHow to use error message Dynamic Configure To Order CTOImportant notice for replacing a system board Click Warranty & Services Click Check Warranty Status Using PEWFRU identification for CTO, CMV, and GAV products Custom Model Variant CMVClick Product & Parts Detail Click Parts & AccessoriesWhat to do first General checkoutFollowing are not covered under warranty Lenovo Solution CenterCheckout guide Quick test programsUefi diagnostic program Bootable diagnostic programsTests Tools Power system checkout Checking the ac power adapterClick Lenovo Bootable Diagnostics Checking the backup battery Checking the battery packWire Voltage V dc Checking operational chargingHardware Maintenance Manual Restoring the factory contents by using Recovery Disc Set Related service informationRefreshing the computer Passwords Power-on passwordHard-disk password How to remove the power-on password Supervisor passwordHow to remove the hard-disk password Select Power-On PasswordSleep mode Power managementHibernation mode Select Master HDPWireless off mode Symptom-to-FRU indexNumeric error codes 0190 Charge the battery pack Symptom or error FRU or action, in sequence 01890191 Run the ThinkPad Setup program, and then save 0199 Run the ThinkPad Setup program, and then saveError messages No-beep symptomsBeep symptoms Intermittent problems LCD-related symptomsUndetermined problems Reseat the LCD connectorsHardware Maintenance Manual Indicator Meaning Status indicatorsIndicator Meaning Special key Description Special keysSpecial key Description Locating computer controls, connectors, and indicators LocationsFront view Rear view Bottom viewLocating FRUs and CRUs CRU statement for customers Major FRUs and CRUs Description Self-service CRU Optional-serviceCRU LCD FRUs Hinge Button board Looking up FRU informationHardware Maintenance Manual Screw notices FRU replacement noticesPlastic to plastic Logic card to plasticRetaining serial numbers Restoring the serial number of the system unitMTM on rear label Retaining the Uuid Reading or writing the ECA informationProduct ID on rear label Hardware Maintenance Manual General guidelines Removing or replacing a FRUBefore servicing the computer Disabling the built-in batteryRemoving the SIM card Hard disk drive or solid-state driveRemoving or replacing a FRU Keyboard Removal steps of keyboardStep Screw quantity Color Torque Removing or replacing a FRU When installing PCI Express Mini Card for wireless LANRemoval steps of PCI Express Mini Card for wireless LAN Removal steps of PCI Express Mini Card for wireless WAN Removal steps of mSATA solid-state drive Keyboard bezel, backup battery, and speaker assembly Removal steps of keyboard bezelStep Screw cap Screw quantity Color Torque M2 × 3 mm, wafer-head, nylon-coated Silver 181 Nm Kgf-cm Hardware Maintenance Manual Battery pack Proximity sensors Important notices for replacing a battery packRemoval steps of proximity sensors Removal steps of thermal fan assembly LCD unit Removal steps of LCD unit When installing M2.5 × 3 mm, wafer-head, nylon-coated Silver 181 Nm Kgf-cm Removal steps of DC-in connector DC-in connectorSystem board and base cover assembly Removal steps of system board and base cover assemblyImportant notices for handling the system board Applying labels to the base cover Following illustration shows the location of each label Button bezel LCD panelRemoval steps of button bezel Removal steps of LCD panel Button boardRemoval steps of button board Integrated cameraHinge Removal steps of integrated cameraRemoval steps of hinge When installing Removal steps of wireless antenna assembly Removing or replacing a FRU Hardware Maintenance Manual Appendix A. Notices Trademarks Electronic emissions noticesPage 1P0B48943
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