LG Electronics LW20 service manual Ch4. Symptom-to-part index Indeterminate problems

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Ch4. Symptom-to-part index

Indeterminate problems

·You are here because the diagnostic tests did not identify which adapter or device failed, wrong devices are installed, a short circuit is suspected, or the system is inoperative.

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.

1.Power off the computer

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

3.Remove or disconnected all of the following devices :

a.Non-LG devices.

b.Printer, mouse, and other external devices.

c.Battery pack.

d.PC cards.

e.ODD (CD-ROM, Combo) drive or FDD drive in the Bay.

f.Hard-disk drive.

Note

Use the other memory card because it needs when operating computer.

4.Power on the computer.

5.Determine whether the problem has changed.

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 non-defective FRU)

a.LCD assembly (Check external monitor whether the same problem recurs or not).

b.Keyboard.

c.Keydeck (TouchPad and Scroll Button assembly).

d.System board.

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Contents LW20 LG Electronics Page „ Strategy for replacing a hard-disk drive Ch1. Service informationBefore replacing parts Ch1. Service information Safety notices Ch1. Service information Safety information „ General safety Ch1. Service information „ Electrical safety Ch1. Service information Ch1. Service information „ Safety inspection guide „ Grounding requirements Backup Standby RTC battery safety information Ch1. Service information Laser compliance statementImportant Notes Ch1. Service information Read this first„ What to do first Followings are not covered under warranty Security key hole Kensington Lock Ch2. Locations„ Front view „ Rear viewEmergency eject hole Ch2. Locations „ Left view„ Right view Ch3. System information „ SpecificationInformation DiagramSystem Location with Fn + F7 combination Ch3. System information „ Fn key combinationsCh3. System information „ Status indicators Ch3. System information „ Bios Flash Ch3. System information „ Bios Setup Ch3. System information „ Using the keys Ch3. System information „ Main menu „ Security menu Ch3. System information „ Advanced menu„ Exit menu Ch3. System information „ Boot menu„ Power system checkout Ch4. Symptom-to-part indexPin Voltage V dc +18.0 ~ +19.2 Ground Ch4. Symptom-to-part index Ch4. Symptom-to-part index + 4 3 2 Symptom / Error FRU or action, in sequence Ch4. Symptom-to-part index „ Numeric error codesDMA test failed System board 02F6 02F7 Ch4. Symptom-to-part index „ Error message Ch4. Symptom-to-part index „ LCD-related symptoms Ch4. Symptom-to-part index „ Indeterminate problems Ch5. Removing and replacing a part Removing and replacing a part FRUCh5. Removing and replacing a part Battery Pack Ch5. Removing and replacing a part Hard Disk Drive Ch5. Removing and replacing a part Optical Disk Drive Ch5. Removing and replacing a part Retainer Disconnect Retainer Connector Remove Retainer Ch5. Removing and replacing a part Keyboard Remove Keyboard Ch5. Removing and replacing a part Display Module Ch5. Removing and replacing a part Key Deck Disconnect Touchpad Connector Remove Key Deck Ch5. Removing and replacing a part Sub B/D Ch5. Removing and replacing a part Speaker Ch5. Removing and replacing a part Fan Assembly Ch5. Removing and replacing a part Main Board Ch5. Removing and replacing a part 1SZZBA4101A Ch5. Removing and replacing a part 1SZZBA4104A Remove 4 Screws FRU No Specification Qty Remove Inverter Disconnect LED Sub Board Connector 1SZZBA4041A D3.5 X L3.0 Ch5. Removing and replacing a part D3.5 X L3.0 Disconnect LCD Cable Ch6. Part lists Part listsNPLT2 NNOB2 NCAB5 Korea Windriver Sunrex 84KEY Silver NKBD2 Norway Silver Windriver Sunrex NKBD2 LW20 LW20 1SZZBA4017F 1SZZBA4097B Plate Windriver HDD Korea Windriver Sunrex 84KEY KBD Assembly Korea Windriver Sunrex 84KEY Silver KBD Assembly 1SZZBA4097B 1SZZBA4080A NCAB3 NFAN2 Plate Windriver ODD BAY NFRM1 LW20 RH80536GE0462M LG Intel 478P Ufcpga IC,MICRO NSHT3 Windriver Rubber Display Front Upper Cushion Windriver 6.5 KGF-CM Hinge Left Latchless LW20 Hitachi Wireless L Windriver Antenna NANT2 Windriver SUS LCD Left 0.5T 12.1INCH Bracket