LG 22LS4D Series Service Manual Download Page 1

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LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : LD73B

MODEL : 22LS4D

22LS4D-ZB

website:http://biz.LGservice.com

Internal Use Only

Summary of Contents for 22LS4D Series

Page 1: ...LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD73B MODEL 22LS4D 22LS4D ZB website http biz LGservice com Internal Use Only ...

Page 2: ...lectronics Inc All right reserved Only for training and service purposes 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 10 TROUBLE SHOOTING 14 BLOCK DIAGRAM 21 EXPLODED VIEW 22 REPLACEMENT PARTS LIST 24 SVC SHEET ...

Page 3: ...fe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna term...

Page 4: ... on your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge...

Page 5: ...the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replac...

Page 6: ...R S21 S47 4 Input Voltage 100 240V 50Hz 60Hz 5 Market EU 6 Picture Size 22 inch 7 Tuning System FVS 100 program PAL 200 PR Option 8 Operating Environment 1 Temp 0 40 deg 2 Humidity 10 90 9 Storage Environment 3 Temp 20 50 deg 4 Humidity 10 90 10 Display LCD Module LPL 2 General Specification LCD Module No Item Specification Remark 1 Panel 22 TFT WSXGA LCD 2 Frequency range H 51 495 81 522 kHz V 48...

Page 7: ...3 Typ Wy 0 03 0 329 0 03 Red Xr 0 635 Yr 0 342 Green Xg 0 292 Yg 0 611 Blue Xb 0 147 Yb 0 070 No Specification Proposed Resolution H freq kHz V freq Hz 1 720X480 15 73 60 00 SDTV DVD 480i 2 720X480 15 63 59 94 SDTV DVD 480i 3 720X480 31 47 59 94 480p 4 720X480 31 50 60 00 480p 5 720X576 15 625 50 00 SDTV DVD 625 Line 6 720X576 31 25 50 00 HDTV 576p 7 1280X720 45 00 50 00 HDTV 720p 8 1280X720 44 96...

Page 8: ...883 119 00 CVT Red Blanking 15 1680X1050 65 290 59 954 146 25 CVT 16 1920X1080 66 647 59 988 138 625 WUXGA 7 HDMI DTV Table No Resolution H freq kHz V freq Hz Pixel clock MHz Remark Proposed 1 720X480 31 47 59 94 27 00 SDTV 480p 60Hz 4 3 2 720X480 31 50 60 27 027 SDTV 480p 60Hz 4 3 3 640X480 31 50 59 94 25 175 SDTV 480p 60Hz 4 3 4 640X480 31 50 60 25 20 SDTV 480p 60Hz 4 3 5 720X480 31 47 59 94 27 ...

Page 9: ... 48 363 60 00 65 00 VESA XGA 56 476 70 00 75 00 60 023 75 03 78 75 6 1280X768 47 693 59 99 80 125 VESA WXGA 7 1360X768 47 649 59 94 84 625 VESA WXGA 8 1366X768 47 649 59 94 84 625 Supported 9 1280X1024 63 981 60 020 108 00 VESA SXGA 10 1440X900 55 469 59 901 88 750 CVT Red Blanking 11 1440X900 55 935 59 887 106 5 CVT 12 1400X1050 64 744 59 948 101 00 CVT Red Blanking 13 1400X1050 65 317 59 978 121...

Page 10: ...06 10 d Model Name Hex e 1 e 2 f Checksum Changeable by total EDID data D sub to D sub DVI D to HDMI or HDMI or HDMI For HDMI EDID For Analog EDID Item Manufacturer ID Version Revision Condition GSM Digital 1 Digital 3 Data Hex 1E6D 01 03 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x00 00 FF FF FF FF FF FF 00 1E 6D a b 0x01 c 01 03 08 2F 1E 78 0A AE C5 A2 57 4A...

Page 11: ...s the adjustment is completed 6 2 Adjustment of Component 1 Required Equipments Remote controller for adjustment MSPG 925FS Pattern Generator Which has 720p 50Hz YPbPr output Pattern shown in Fig 1 Model 215 Pattern 65 2 Method of Auto Component Color Balance 1 Input the Component 720p 50Hz 7 Color Bar MSPG 925FS model 215 pattern 65 signal into Component 2 Set the PSM to Dynamic mode in the Pictu...

Page 12: ... start keep the power on no suspension of power supply and heat run over 15 minutes Using no signal or full white pattern or the others check the back light on 7 1 Auto white Balance Set RS 232 Host PC Baud Rate 115200bps Download Cortez Inside pattern is used when balance is controlled Connect as below figure and click the start button on W B execution program W B is automatically processing Cool...

Page 13: ... by lowering from 80 3 When G GAIN is set to 80 Control R GAIN and B GAIN by lowering from 80 One of R Gain G Gain B Gain should be kept on 80 and adjust other two lower than 80 When R G B GAIN are all 80 it is the FULL DYNAMIC Range of Module 8 Set information Serial No Model name 1 Setting up like bottom figure After setting white balance this is set 1 Press ADJ Key in the Adjust remocon 2 Selec...

Page 14: ...Monitor signal appear No 7 Check the VSC Vs ON signal Does the high tension output appear Does the VSC signal Vs ON appear No No Does the high tension output voltage occur When removing the Y B D Module input connector does output voltage drop When the Y Z B D Module input connector does Power Board high tension output voltage drop No No No 9 Check the Power Board Output high tension circuit Yes 1...

Page 15: ...ged in Plug in the power cord Yes No Is the Line Filter and Power Board Cable connected Connect the Cable Yes No Is the appropriate Fuse F101 on the Power Board Replace the Fuse Yes No Is the Power Board and 13P of VSC Board Cable connected Connect the Cable Yes No After removing the cables connect them to the Power Board except the SC101 connection cable and change the AC voltage marking to manua...

Page 16: ...output voltage normal after removing P103 connector of Y B D Is the appropriate Fuse FS101 FS102 on the Y B D normal Replace if open Yes No Yes Yes Replace the Z Board Is the Z Board normal Is the output voltage normal after removing P1 connector of Z B D Is the appropriate Fuse FS1 FS2 on Z B D replace if open Yes No Yes Is the X Board normal Is the output voltage normal after removing P1 2 3 4 5...

Page 17: ...ormal Is the VAVS on Check the LCD Module Yes No YES Yes Reconnect the LVDS cable in P800 No Is the IC700 FLI8548 Output normal Replace the VSC No NO Replace the Power board Is the Low High output voltage normal except for stand by 5V NO 4 No Raster 1 Symptom 1 No OSD and image occur at screen 2 It maintains the condition where the front LED is green 2 Procedure check ...

Page 18: ...lay 1 Symptom 1 LED is green 2 The minute discharge is continuously accomplished from the module 2 Procedure check Is the LVDS cable normal Is the VSC Board normal Is the LVDS cable connected Re insert the Cable Yes No No Yes Does the FIL8548 IC IC700 operate Replace the FIL8548 IC IC700 No Is the Ctrl Board of Module normal Replace the Ctrl B D No No Yes Replace the VSC B D Replace the cable Yes ...

Page 19: ...sual display in HDMI mode 6 In case of an unusual display in SCART1 mode Is the Tuner normal Is the CXA2069Q normal Is the Tuner Cable connected Re insert the cable Yes No No Yes Is the FIL8548 normal Replace the Tuner No Are the Input voltage IIC Communication and CVBS output normal Yes Are the Input voltage IIC Communication and HV sync normal No Replace the IC No Are the input voltage IIC Commu...

Page 20: ... Download the EDID data Check the signal after CAX2069 refer to circuit diagram No Is there no sound only for specific input except HDMI DTV RF Check the signal before CAX2069 refer to circuit diagram No YES YES Is there no sound only for RF Check the Tuner IN OUT No YES YES Is there no sound only for AV component PC input Is the output of CXA2069 normal No YES Is the IC1300 operating normally Rep...

Page 22: ...E Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 22 300 200 531 530 580 520 521 523 400 120 590 591 910 900 920 150 LV1 EXPLODED VIEW A21 A2 ...

Page 27: ...Aug 2007 Printed in Korea P NO MFL36695320 ...

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