LG Electronics LW20 service manual Pin Voltage V dc +18.0 ~ +19.2 Ground

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Ch4. Symptom-to-part index

·Checking the AC adapter

If the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity and installation.

If the computer does not charge during operation, go to “Checking operational charging.”

To check the AC adapter, do the following :

1. Unplug the AC adapter cable from the computer.

2.Measure the output voltage at the plug of the AC adapter cable. See the following figure:

3.If the measured output voltage is incorrect, remove

the power cord from the AC adapter and then re-	2
connect it in about ten seconds.	1

4.Measure the output voltage at the plug of the AC adapter cable.

5.If the measured output voltage is incorrect, replace the AC adapter.

Pin	Voltage (V dc)

1+18.0 ~ +19.2

2Ground

25

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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 Ch1. Service information Laser compliance statement Backup Standby RTC battery safety informationImportant Notes Ch1. Service information Read this first„ What to do first Followings are not covered under warranty „ Rear view Ch2. Locations„ Front view Security key hole Kensington LockEmergency eject hole Ch2. Locations „ Left view„ Right view „ Specification Ch3. System informationInformation DiagramSystem Ch3. System information „ Fn key combinations Location with Fn + F7 combinationCh3. 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 Ch3. System information „ Advanced menu „ Security menuCh3. System information „ Boot menu „ Exit menuCh4. Symptom-to-part index „ Power system checkoutPin Voltage V dc +18.0 ~ +19.2 Ground Ch4. Symptom-to-part index Ch4. Symptom-to-part index + 4 3 2 Ch4. Symptom-to-part index „ Numeric error codes Symptom / Error FRU or action, in sequenceDMA 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 Removing and replacing a part FRU Ch5. Removing and replacing a partCh5. 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 Part lists Ch6. 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