LG Electronics LW20 service manual Ch4. Symptom-to-part index, Power system checkout

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Ch4. Symptom-to-part index

Chapter 4. Symptom-to-part index

The symptom-to-part index in this section lists symptoms and errors and their possible causes. The most likely cause is listed first.

Note

If replacing a part (FRU) does not solve the problem, put the original part back in the computer. Do not replace a non-defective FRU.

Power system checkout

·To verify a symptom, do the following :

1.Power off the computer.

2.Remove the battery pack.

3.Connect the AC adapter.

4.Check that power is supplied when you power on the computer.

5.Power off the computer.

6.Disconnect the AC adapter and install the charged battery pack.

7.Check that the battery pack supplies power when you power on the computer.

·If you suspect a power problem, see the appropriate one of the following power supply checkouts :

1.Checking the AC adapter

2.Checking the operational charging

3.Checking the battery pack

4.Checking the backup battery

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Contents LW20 LG Electronics Page Before replacing parts Ch1. Service information„ Strategy for replacing a hard-disk drive 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 statement„ What to do first Ch1. Service information Read this firstImportant Notes Followings are not covered under warranty „ Front view Ch2. Locations„ Rear view Security key hole Kensington Lock„ Right view Ch2. Locations „ Left viewEmergency eject hole Ch3. System information „ SpecificationSystem DiagramInformation 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