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- 2 - specifications 1. lcd characteristics type : tft sxga lcd size : 18.1inch (45.97cm) pixel pitch : 0.2805(h) x 0.2805(v) pixel format : 1280 x 1024 pixels (sxga) rgb stripe arrangement color depth : 8-bit, 16,581,375 colors active video area : 413mm x 333mm surface treatment : anti-glare, hard coating (3h) backlight unit : four-ccfl (cold cathode fluorescent lamp) 2. optical characteristics 2-1. viewing angle by contrast ratio 10 left : 80 min. , right : 80 min. top : 80 min. , bottom : 80 min. 2-2. luminance : 170 cd/m 2 (min) 2-3. angle at half luminance left : 45 min. , right : 45 min. top : 45 min. , bottom : 45 min. 2-4. contrast ratio : 300 typ. 3. signal (refer to the timing chart) 3-1. sync signal ?type : separate, ttl, positive/negative composite, ttl, positive/negative sog (sync on green) digital 3-2. video input signal 1) type : r, g, b analog 2) voltage level : 0~0.714 v a) color 0, 0 : 0 vp-p b) color 7, 0 : 0.467 vp-p c) color 15, 0 : 0.714 vp-p 3) input impedance : 75 ? 3-3. operating frequency horizontal : 30 ~ 80khz vertical : 56 ~ 85hz 4. power supply 4-1. power adaptor input : ac 100~240v, 50/60hz , ~2.0 - 1.0a output : dc 12v 5.8a 4-2. power consumption 5. environment 5-1. operating temperature: 10?~35? (50?~95?) (ambient) 5-2. relative humidity : 10%~80% (non-condensing) 5-3. altitude : 0~10,000ft (3,030m) 6. dimensions (with tilt/swivel) width : 434 mm (17.09'') depth : 235 mm (9.25'') height : 443 mm (17.44'') 7. weight (with tilt/swivel) net. weight : 9.0kg (20.65 lbs) gross weight : 12.3kg (27.12 lbs) 8. usb upstream : 1 port, downstream : 4 port speed : high-12mbps, low-1.5mbps mode power on (normal) stand-by suspend off power off h/v sync on/on off/on on/off off/off - power consumption less than 70 w less than 5 w less than 5 w less than 5 w less than 5 w led color green amber amber amber off video active off off off -
schematic diagram - 44 - 1. input switching
- 45 - 2. ad9884 (pre-amp/pll/adc)
- 46 - 3. video process
- 47 - 4. memory
- 48 - 5. lvds
- 49 - 6. micom
- 50 - 7. dc/dc convertor
- 51 - 8. connector & jacks (brand)
- 52 - 9. usb
- 53 - 10. control/power key
- 10 - wiring diagram j801 j805 cn2 cn3 cn5 cn4 cn2 j807 j804 j1 cn1 j2 j3 connector ass? p/n: 6631t11010d
block diagram - 13 -
description of block diagram - 14 - 1. input signal switching part. this part switch h/v sync and analog video signal to be entered through port1 and port2 and output a selected h/v sync and analog video signal. 2. pre-amp/ adc / pll part. this part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the digital video signal using a pixel clock. the pixel clock for each mode is generated by the pll.the range of the pixel clock is from 25mhz to 135mhz. 3. video controller part. this part consists of the scaler and frame buffers which converts frame rate of input signal to 60hz frame rate. the scaler gets the video signal converted analog to digital, interpolates input to 1280 x 1024 resolution signal and outputs 8-bit r, g, b signal to transmitter. 4. display data transmitter part. this part transmit digital signal from the scaler to the receiver of module. 5. power part. this part consists of the dc/dc converter and several 3.3v regulators. the dc/dc converter coverts 12v to be entered power adapter to 5v. 5v, output of dc/dc converter, supply to the micom and 3.3v regulators. the output voltage of 3.3v regulator supply to ic of each part. 6. micom part. this part consists of eeprom ic which stores control data, reset ic and the micom. the micom distinguishes polarity and frequency of the h/v sync are supplied from signal cable. the controlled data of each mode is stored in eeprom. 7. inverter the inverter converts from 12v to ac 700v and drive back-light lamp of module. 8. usb usb part consists of downstream/upstream and usb hub. a entered usb peripheral signal from downstream transfer pc through usb hub and upstream. or a entered pc signal from upstream transfer usb peripheral through usb hub and downstream.
- 16 - troubleshooting guide 1. no power trouble in u718 check 5vst voltage (5v) ? no no power (power indicator off) trouble somewhere else trouble in adaptor or inverter check u718 input voltage (12v) ? no trouble in u617 or x603 no yes yes yes check u617? pin 6. is this pin oscillated?
- 17 - 2. no raster trouble in invon pattern check j805 pin 5 (5v) ? no no raster trouble in power adater check j805 pin 10 (12v) ? no trouble in u106, u105, u101, u109 check u617 pin 42 h. pulse ? no trouble in u102, u101, u109 check u205 pin 40 h.pulse ? no trouble in u205 no trouble in u205 check u205 pin 115 ad clock ? no yes yes yes yes yes yes check u205 pin 117 h.pulse?
- 18 - check adc-clk pattern check u307 pin 254 dot clock ? no check hs-pll pattern check u307 pin 246 h.pulse ? no trouble in u307 no trouble in u307 no trouble in u307 no yes yes yes yes yes yes check memoryclk u410, u411, u412 pin 35 ? check u307 pin 93, 94 dot clock ? check u307 pin 124 d26 (h.pulse) ?
- 19 - trouble in u307 no trouble in u307 no trouble in u307 no trouble in u307 no yes yes yes yes yes trouble in lcd module check u513, u514 pin 31 dot clock? check u513, u514 pin 30 h.pulse? check u513, u514 pin 28 v.pulse ? check u513, u514 pin 27 h.pulse ?
- 20 - 3. no clock (clock generator) trouble in u101, u109, u105, u106 check u205 pin 40 h. pulse ? no no dot clock trouble in u729 check u205vcc 3.3v ? no trouble in u205 check u205 pin 115 clock ? no trouble in u101, u109, u105, u106 check u205 pin 40 h. pulse ? no yes yes yes
- 21 - 4. trouble in dpm trouble in u109 no trouble in dpm trouble in pc check pc cpc is not going intp dpm off mode no trouble in x603 no trouble in signal cable no yes yes yes yes check u617 pin 6 waveform (24mhz) ? check u617 (micom) pin 1, 42 (h/v input) signal ? check u109 pin 1, 5 ? check u617 pin 26 (5v) ?
adjustment - 15 - all adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several minor adjustment may be required. adjustment should be following procedure and after warming up for a minimum of 10 minutes. ?alignment appliances and tools. - ibm compatible pc - programmable signal generator. (eg. vg-819 made by astrodesign co.) - e(e)prom with each mode data saved. 1. adjustment start 1) display any pattern at any mode. 2) run alignment program for ls882c on the ibm compatible pc. 3) select eeprom all init command and enter 4) this will make all data to default state 5) select command preset start command and enter 2. adjustment for factory preset mode 1) select dist. adj fos default command and enter 2) it will copy all factory default data to eeprom automatically. 3. adjustment for white balance 1) display color 0,0 pattern at mode 15. 2) set external bright to max position and contrast to max position. 3) select preset start bias cal command and enter. 4) no attempt to manually adjust, bias data is auto- matically adjusted and saved to the eeprom. 5) display color 15,0 pattern at mode 15. 6) select drive cal command and enter. 7) 6500k and 9300k are automatically adjusted and saved to the eeprom. 8) select preset exit command and enter. figure 1. cable connection 220 ibm compatible pc video signal generator parallel port power inlet (required) power led st switch power select switch (110v/220v) control line not used rs232c parallel v-sync power st vgs monitor e e v-sync on/off switch (switch must be on.) f f a a b b c c 15 10 5 5 6 9 1 1 1 14 13 25 6 5v 5v 5v 4.7k 4.7k 4.7k 74ls06 74ls06 off on off on 11
disassembly - 11 - (a) 1. tilt/swivel removal 1) remove hinge cover. (push the tilt cover both side). 2) remove two screws (a). 3) remove the tilt/swivel. 2. front cabinet removal 1) remove two screws (a). 2) release ten latches (b). 3) remove the front cabinet. (b) (b) (b) (b) (a) front cabinet 3. inverter wire shield & back cover removal 1) remove four screws (a). 2) remove two inverter wire shield. 3) remove four screws (b). 4) remove the back cover. (a) (b) (a) (a) back cover inverter wire shield
- 12 - 4. inverter shield & rear shield removal 1) remove sponge (a). 2) remove two screws (b). 3) remove the inverter shield. 4) remove six screws (c). 5) remove the rear frame. (a) (a) (b) (b) (a) (c) 5. main total ass? removal 1) disconnect cn2, cn3, cn4 and cn5. 2) remove five screws (a). 3) remove two aluminium tape (b). 4) disconnect j805. 5) remove aluminium tape (c). 6) disconnect fpc cable, module connector and control pcb connector. 7) remove main total ass? and inverter pcb ass?. (b) rear frame inverter shield fpc cable control pcb connector module connector (c) (c) (c) (a) cn5 cn4 cn3 cn2 j805
control locations - 10 - 1 234 6 57 no. 1 2 3 4 5 6 7 location.no sw7 sw1 sw2 sw3 sw4 sw5 sw6 control function power switch osd down up left right source/set
timing chart - 5 - video sync b d c f e a h + 31.469 800 640 16 96 48 v 70.8 449 350 38 2 59 h 31.469 800 640 16 96 48 v + 59.94 525 480 10 2 33 h 37.5 840 640 16 64 120 v 75 500 480 1 3 16 h 43.269 832 640 56 56 80 v 85.0 509 480 1 3 25 h 31.468 900 720 18 108 54 v 70.8 449 400 12 2 35 h + 37.879 1056 800 40 128 88 v + 60.317 628 600 1 4 23 h + 46.875 1056 800 16 80 160 v + 75.0 625 600 1 3 21 h + 53.674 1048 800 32 64 152 v + 85.061 631 600 1 3 27 h +/ 49.725 1152 832 32 64 224 v +/ 74.55 667 624 1 3 39 h 48.363 1344 1024 24 136 160 v 60.0 806 768 3 6 29 h 60.123 1312 1024 16 96 176 v 75.029 800 768 1 3 28 h + 68.677 1376 1024 48 96 208 v + 84.997 808 768 1 3 36 h +/ 68.681 1456 1152 32 128 144 v +/ 75.062 915 870 3 3 39 h +/ 61.805 1504 1125 18 134 200 v +/ 65.96 937 900 2 4 31 h + 63.981 1688 1280 48 112 248 v + 60.02 1066 1024 1 3 38 h + 79.976 1688 1280 16 144 248 v + 75.035 1066 1024 1 3 38 mode h/v sort 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 25.175 28.321 31.5 36.0 25.175 40.0 49.5 56.25 57.283 65.0 78.75 94.5 100.0 92.978 108.0 135.0 640x350 70hz 640x480 60hz 640x480 75hz 640x480 85hz 720x400 70hz 800x600 60hz 800x600 75hz 800x600 85hz 832x624 75hz 1024x768 60hz 1024x768 75hz 1024x768 85hz 1152x870 75hz 1152x900 65hz 1280x1024 60hz 1280x1024 75hz << dot clock (mhz), horizontal frequency (khz) , vertical frequency (hz) , horizontal etc... (s) , vertical etc... (ms) >> sync polarity frequency dot clock total period (e) video active time (a) sync duration (d) back porch (f) front porch (c) resolution
exploded view 11 17 b b c c 18 19 20 21 22 12 9 8 5 6 7 10 a c c a 16 d 13 15 7 14 exploded view parts list ref. no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 a b c d part no. 3091tkl022d 6304tlt181s 3809tkl006f 3043tkk037g 4814tkk064a 4950tks096c 6871tmt216a 4951tkk049a 6631t11010d 6633tza004a 4814tkk067a 6871tst217a 3550tkk053c 3550tkk050c 3550tkk051c 3550tkk052c 6871tst197a 6634tbz006a 6866td9001f 6866tdv004c 6866tdu002d 6634tfz004a 332-095e 332-095c 332-110a 332-105c description cabinet assy ls882c brand 3090tkl021a pc+abs 85964 lcd(liquid crystal display) lm181e1-j3mn(s) lgphlips color 18.1 1280x1024 back cover assy, ls882c 006 tilt swivel assy, ls882c shield inverter wire(lq800) metal frame (lb885) pwb(pcb) assembly, main, ls882c xagc brand . total metal assy, rear ls882c connector assy, 21p h-h 160mm ul20276sb10p+2c awg#30 lb885c inverter assy, samsung lg1801 for 18.1" lcd mnt(lb880b) shield inverter(lq800) pwb(pcb) assembly,sub ls882c xagc brand . total cover lb880b hinge 18.1" brand cover lb880b stand front 18.1" brand cover lb880b stand rear 18.1" brand cover lb880b base top 18.1" brand pwb(pcb) assembly,sub, lh881d xagt h/packard zanskar total adapter, ac-dc, pscv700101a samsung 100-240v 12v 5.8a for lg signal cable ul 2990-9c(7.5) dt 1870mm gray(85964) lb500 dm cable, dvi, ul20276 dt 2000mm gray(85964) lb885c dm (dvi-i cable) signal cable ul20276sb10p+2c awg#30 dt 1870mm gray(85964) brand (usb cable) adapter,signal , dvi-i(mail)-vga(fmail) unixtar lb885c screw, pzp+3*16(mswr/fzmy) screw, pzp+3*12(mswr/fzmy) std screw, pzs+3*6 (mswr/fzmy) screw, pvs+4*12(mswr/fzmw)
- 3 - signal connector pin assignment pin signal (d-sub) 1 2 3 4 5 6 7 8 red video green video blue video ground ground red ground green ground blue ground pin signal (d-sub) 9 10 11 12 13 14 15 n.c. sync.ground ground sda h. sync. v. sync. scl 11 6 1 5 15 10 note no. 5 pin have to ground on the pc side. pin signal (dvi-i) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 t. m. d. s. data2- t. m. d. s. data2+ t. m. d. s. data2/4 shield t. m. d. s. data4- t. m. d. s. data4+ ddc clock ddc data analog vertical sync. t. m. d. s. data1- t. m. d. s. data1+ t. m. d. s. data1/3 shield t. m. d. s. data3- t. m. d. s. data3+ +5v power ground (return for +5v, h. sync. and v. sync.) pin signal (dvi-i) 1 8 9 17 24 16 c1 c4 c3 c2 c5 16 17 18 19 20 21 22 23 24 c1 c2 c3 c4 c5 hot plug detect t. m. d. s. data0- t. m. d. s. data0+ t. m. d. s. data0/5 shield t. m. d. s. data5- t. m. d. s. data5+ t. m. d. s. clock shield t. m. d. s. clock+ t. m. d. s. clock- analog red analog green analog blue analog h. sync. analog ground t. m. d. s. (transition minimized differential signaling) ?15pin vga connector ?dvi-i connector (digital/analog)
- 4 - warning for the safety-related component. there are some special components used in lcd monitor that are important for safety. these parts are marked on the schematic diagram and the replacement parts list. it is essential that these critical parts should be replaced with the manufacturer s specified parts to prevent electric shock, fire or other hazard. do not modify original design without obtaining written permission from lg or you will void the original parts and labor guarantee. take care during handling the lcd module with backlight unit. must mount the module using mounting holes arranged in four corners. do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen. do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to the panel. protect the module from the esd as it may damage the electronic circuit (c-mos). make certain that treatment person s body are grounded through wrist band. do not leave the module in high temperature and in areas of high humidity for a long time. the module not be exposed to the direct sunlight. avoid contact with water as it may a short circuit within the module. if the surface of panel become dirty, please wipe it off with a softmaterial. (cleaning with a dirty or rough cloth may damage the panel.) warning be careful electric shock ! if you want to replace with the new backlight (ccfl) or inverter circuit, must disconnect the ac adapter because high voltage appears at inverter circuit about 650vrms. handle with care wires or connectors of the inverter circuit. if the wires are pressed cause short and may burn or take fire. precaution caution please use only a plastic screwdriver to protect yourself from shock hazard during service operation. caution there is two backlight, must distinguish between the top (upper) and the bottom (lower), and be careful of treatment it. mtbf (mean time between failure) of a backlight is about 30,000 hours. if brightness of the lcd module darken, replace the backlight one or all. backlight ass y (p/n: 6913tzz002a)

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