LG Electronics LW20 service manual Ch4. Symptom-to-part index LCD-related symptoms

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Ch4. Symptom-to-part index

LCD-related symptoms

Note

Before removing or disassembling LCD, power off the computer, unplug all power cords from electrical outlets, remove the battery pack also.

Symptom / Error		FRU or action, in sequence

LCD screen becomes dark suddenly.	Check out Battery Miser.

Nothing displayed on LCD screen.	1.	Check out Battery Miser.
	2.	Choose Never in the Turn off Monitor item on
		Power Options Properties.
	3.	Check the power save mode switch if it is pressed
		by something.
	4.	Check the System is in standby or hibernation
		mode.

LCD backlight not working.	1.	Reconnect inverter to the board connector.
LCD too dark.	2.	Replace inverter.
LCD brightness cannot be adjusted.	3.	LCD assembly.
	4.	System board.

LCD color cannot be adjusted.	1.	Reset all LCD connectors.
LCD screen abnormal.	2.	Replace LCD cable.
Characters missing pixels.	3.	LCD assembly.
LCD screen unreadable.	4.	System board.
Wrong color displayed.

Horizontal or vertical lines displayed	LCD assembly.
on LCD

Power-on indicator on, and a blank\LCD	LCD assembly.
during POST.	System board.

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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 Ch1. Service information Laser compliance statement Backup Standby RTC battery safety information„ What to do first Ch1. Service information Read this firstImportant Notes Followings are not covered under warranty „ Rear view Ch2. Locations„ Front view Security key hole Kensington Lock„ Right view Ch2. Locations „ Left viewEmergency eject hole „ Specification Ch3. System informationSystem DiagramInformation 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