Service manual LM1931W
Contents
1. Press the MENU button to start the OSD function Pree Or button to select adjusting function Press button to enter into the function which is going to be adjusted Pree lt button to change the present setting value of the function Press Exit to leave the OSD menu or return to the former action and it can store the change points Attention Press lt button to move OSD in a numerical order Press 5 button to move OSD in a reverse numerical order Language ENGLISH Francais Deutsch Espanol Italiano Japanese Korean simplified Chinese Input signal choice VGA input signal is analogue DVI input signal is digital 3 Maintaining Instruments and Test Equipment Definition Defect circuit board and the inside signal cable change 3 1 Instruments m 2 Electric screwdriver 3 Cross head driver Hex screw driver 3 2 Test equipment PC for test PDF created with pdfFactory Pro trial version www pdffactory com 4 Problem analysis Problem phenomenon Problem analysis inspect the panel 9 PDF created with pdfFactory Pro trial version www pdffactory com Problem phenomenon Problem analysis Inspect PCB Inspect panel Inspect PCB 10 PDF created with pdfFactory Pro trial version www pdffactory com Problem phenomenon Problem analysis Whit screen displa2. 16 As following photo shown plug off connecting wire among A D board inverter and Lips board 20 Ham 17 As following photo shown push panel wire lock parallelly and then plug off panel wire from A D board interface 21 6 Maintaining Parts Form eme Back cover Stand base support down cover 5 Stand base support up cover 22
3. Service manual 1111 3 31 CATALOG 1 Safety item which should be paid attention to when maintaining sss 1 2 Monitor appearance and hardware structure introduction sse 2 21 Dbrontappedratice XdE3WITIS oinen SM SAUL 2 22 Back appearance dra WI este tt etd tiet dele te 3 m ottico tette 4 Block ctio past ee 5 2 5 DS UB Pin 5011918 etnies a St tiic heit omen 5 E O DA A DL OL O 6 a ee ere 6 6 3 Maintaining instruments and test equipment tette 8 A E E T E A 8 8 AED A eese A T E i E AEEA NE E E T 9 5 Monitor disassembly and assembly flow eene 14 6 Maintaining parts 17 EI ML 17 ALAD BOSE PANCI DU Conector E 21 71 POWER c stets tert etat as uL d 2 11 Inverter Board sc em 20 Lest method aper TVA UCT AIC esso osea ihe eta 21 8 1 Test method when disconnected with the PC nes 21 Safety item which should be paid attention to when maintaining 11 Before connecting the AC power to the monitor please make sure the monitor specified voltage can work with the local voltage 1 2 LCD monitor should be pl
4. aced in a low moisture and low dust environment 1 3 Place the monitor onto the hard surface with great care Because the LCD monitor surface is made of Plastic parts and thin glass so dropping shocking or scratching can cause the damage of the LCD monitor 14 When clear the monitor surface please don t use ketone such as acetone ethanol toluol acetic acid methane chloride and etc Because these materials can cause damage to the LCD monitor surface 1 5 When the LCD monitor happens the abnormal situation expecially abnormal sound and smell can be identified please unplug the socket immediately 1 6 When maintaining the LCD monitor to avoid the danger one must completely finish the monitor assembly including driving the screws into the monitor covers and then turn on the monitor and test 2 Monitor appearance and hardware structure introduction 2 1 Front appearance drawing Automatically adjust clock and phase when OSD is not shown or press in three consecutive seconds to switch VGA DVI signal Press it to open the OSD Menu to select Menu options when the OSD Menu 15 displayed Power on or off Blue and flicker LED OFF Volume adjust hot key when OSD is not displayed used for returning to former OSD when OSD menu 15 displayed Contrast ratio key when OSD 15 not displayed move the selected menu down when OSD 15 displayed decrease the value when enter into the OSD 2 2 Back Appearance Drawing N
5. ame 8 Power input 9 input _ DVI input 2 3 Explosion Drawing 19 PARTS NAME Q TY 6 LCDCABEL 1 61 LpsBORD 0 1 91 SHELDCONR 1 20 2 1 RUBBERSHET 6 2 4 System Block Diagram OSD Key 9 240V Aaudio In 2 5 D SUB Pin Definition NC GND NC SDA HSYNC VSYNC SCL 1 2 5 4 5 6 2 6 DVI Pin Definition QOOOOO0O00 o 26900 2 C2 2 2 5i 96960 0 9 2 C2 2 DVI DATA2 DATA2 DATA4 pelos 8 po re 7 8 pwse a mF 85 mir 2 7 OSD Key Function 1 PL It can show and change model PC GAME MOVIE when OSD i not shown 2 Auto automatic adjustment key automatically adjust clock and phase key when OSD is displayed press in consecutive seconds to switch VGA DVI signal 1 MENU Press it to open OSD menu to select Menu options when the OSD menu is displayed 2 Power on or off 3 EXIT Volume adjust hot key when OSD is not displayed used for returning to former OSD when OSD menu is displayed 6 DOWN 4 Contrast ratio key when OSD is not displayed move selected menu down when OSD 15 displayed decrease the value when enter into the OSD 7 UP gt Brightness key when OSD is not displayed move the selected menu up increase the value when enter into the OSD
6. h flatheaded screwdriver from gaps between STAND BACK and front cover as photo shown e XE E X R3 E F W unl Wem ii 4 Take off four marked hinge fixation screws with screwdriver as photo shown then take off hinge and put monitor flat on cushion 16 4 Lock monitor front cover as photo shown location with both hands and put monitor aside 6 Screw off the two screws as photo shown used for key board fixation 7 As photo shown plug off key connecting wire and take off key board 17 8 As following photo shown take off eight screws used for panel fixation 18 10 As photo shown plug off another two lamp wire and panel wire 11 As following photo shown tear off tape acetate stuck on panel interface then plug off panel wire and put panel aside UE _ MEM M TR 4 Ferme E TE T d RA bn e __ 12 As following photo shown take off the four copper poles on VGA and DVI interface of the monitor bottom 13 As following photo shown take off 13 screws of A D board inverter Lips board and cover shield fixation 19 O EJ 2 511111 111111 1 11111111111110 7 15 As following photo shown take off the four screws used for speaker cover fixation and take off the two speaker covers at the same time
7. y Inspect PCB start up delay brightness nonuniformity no back light Inspect when shock display abnormal Inspect PCB Inspect PCB Inspect wire Grey scale Inspect panel abnormal 11 PDF created with pdfFactory Pro trial version www pdffactory com Problem phenomenon Problem analysis C line defect Inspect PCB V broken line H broken line V band Inspect panel H band Power saving abnormal Inspect PCB Special smell Inspect PCB jan Pm Cum 12 PDF created with pdfFactory Pro trial version www pdffactory com Problem phenomenon Problem analysis Power off abnormal Inspect PCB z RN LED no light a LEDdark LED abnormal LEDdamage LEDflickering Inspect PCB NG 8 13 PDF created with pdfFactory Pro trial version www pdffactory com 5 Monitor Disassembly and Assembly Flow 3 Must avoid panel scratch x Must prevent static problems 1 Disassemble the support neck 2 Disassemble the front cover 3 Disassemble the panel 4 Disassemble A D board power board and inverter board D Disassemble the speaker cover 1 Put monitor flat on cushion as following photo shown then press cover latch softly 2 Take the STAND BACK out with hands 3 If it is difficult to disassemble STAND BACK then take STAND BACK off wit
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