LG 24MN42A, Service Manual

Page 1: ...THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED LCD TV SERVICE MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only CHASSIS LM93B MODEL 24MN42A 24MN42A PMN M2442A M2442A PMN ...

Page 2: ...nc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 8 TROUBLE SHOOTING GUIDE 12 BLOCK DIAGRAM 23 EXPLODED VIEW 24 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ...inals etc to be sure the set is safe 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 m...

Page 4: ...lectrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial 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...

Page 5: ...he 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 replace...

Page 6: ...hod 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 4 General Specification 4 1 RGB PC No Item Specification Remarks 1 Supported Sync Type Separate Sync RGB SOG 2 Operating Frequency Analog Horizontal 30 69 kHz Vertical 56 61 Hz 3 Operating Frequency Analog Max 1366 768 60Hz Recommend 1366 768 60Hz 4 Input Voltage Voltage 100 240 Vac ...

Page 7: ...60 00 27 027 SDTV 480P 6 720 576 31 25 50 00 27 000 SDTV 576P 50Hz 7 1280 720 44 96 59 94 74 176 HDTV 720P 8 1280 720 45 00 60 00 74 250 HDTV 720P 9 1280 720 37 50 50 00 74 25 HDTV 720P 50Hz 10 1920 1080 33 72 59 94 74 176 HDTV 1080I 11 1920 1080 33 75 60 00 74 250 HDTV 1080I 12 1920 1080 28 125 50 00 74 250 HDTV 1080I 50Hz 13 1920 1080 67 432 59 94 148 350 HDTV 1080P 14 1920 1080 67 5 60 148 5 HD...

Page 8: ...ng key at Auto RGB 4 Adjustment items 4 1 PCB assembly adjustment items 4 1 1 Input Tool Option Area Option Option adjustment following BOM Tool Option Area Option 1 Required Equipments Remote control for adjustment 2 Profile Must be changed the option value because being different with some setting value Depend on module maker inch and market 3 Adjustment method The input methods are same as othe...

Page 9: ...ircuit number Flash Memory and IC603 2 Tact time about 2min 4 3 Download method 1 4 3 1 Preliminary steps 1 Connect the download jig to 4pin jack P303 2 Connect the PC to USB jack 4 3 2 Download steps 1 Execute ISP Tool program in PC then a main window will be opened 2 Click the Config and Change speed MT8223 Using Port 115200 4ms 3 Click the connect button and confirm 4 Read and write bin file Cl...

Page 10: ...e HEXA 2 Adjustable Data week year ex when year 2008 input 12 CHECK SUM deferent along week year 5 2 Write HDCP key 1 Connect D sub Signal Cable to D Sub Jack 2 Input HDCP key with HDCP key in program 3 HDCP Key value is stored on Main MTK IC MTK8223 which is 0x80 0xA0 Addresses of 0x00 0x01 page EEPROM MAP PAGE0 PAGE1 START Addr A0 80 4 AC off on and on HDCP button of MSPG925 and confirm whether ...

Page 11: ... connect RGB Cable Standard color coordinate and temperature when using the CA210 equipment RGB_Gains are fixed data for each model When doing Adjustment Please make circumstance as below W B condition Ambient Humidity 20 80 Ambient Temperature 25 5 C 7 Function Check 7 1 Check display and sound Check input and Signal items cf work instructions 1 TV 2 AV CVBS 3 RGB PC 1920 x 1080 60hz Display only...

Page 12: ...nes of IC701 If there is any problem at Line Change IC701 NO Check Line short or open between IC600 and X600 Change IC600 or change X600 1 2 4 Is 5V at C716 is 1 1V at C737 3 YES check the Lines of IC704 IC706 If there is any problem at Line Change IC704 IC706 NO Insert F W is 3 3V at 1pin of P200 when push power key Is 0v at 4pin of P200 Change control Or check Line short or open of P200 5 is the...

Page 13: ...t at Line and wafer between IC702 IC703 and IC600 If there is any problem at Line Change IC702 IC703 or IC600 1 2 is 3V at 1pin of IC800 YES It is not over 3V at 1pin of IC800 Change Q801 Or check Line short or open between R803 and 95pin of IC600 Change IC 600 4 3 NO check open or short at Line or change Adapter is 5V at 1pin of P201 If is not under 1 5V at R744 change Q702 or check open and shor...

Page 14: ...NO YES If LVDS cable isn t insulted enough Insult LVDS cable until locking hook If LVDS cable have damage Change LVDS cable 1 Change module WAVEFORMS 3 Is 5V at 1pin of P201 If is not under 1 5V at R744 change Q702 or check open and short of Line among Q703 and Q702 If is under 4 8V at L710 Check open and short Of line between L710 and P201 2 3 NO Check open and short Of line between Q703 and P201...

Page 15: ...V at 5pin of TU401 2 Is I2C waveform At 6 7pin of TU401 3 4 Is IF waveform at 67 68 pin of IC600 NO NO 3 7Pin of TU401 SCL 6Pin of TU401 SDA 4 67 68pin of IC600 If 4 9V is not at plus pin of L705 check It is over 3V at 2pin of IC706 if it is not Check Line between IC706 and IC600 is open or short Another is change IC706 Check Line between TU401 and IC600 is open or short Another is change IC600 or...

Page 16: ...AV Main PCBA Put into AV cable completely Abnormal screen AV YES NO NO Insult AV cable tight 1 Change IC600 WAVEFORMS Is Input signal timing and format in spec Change Timing to 480I 576I Or change format CVBS 2 Is waveform at R651 3 Check Line between JK101 and IC600 is open or short Another is change AV cable NO YES YES R651 CVBS 3 ...

Page 17: ...to RGB cable completely Abnormal screen RGB PC YES NO NO insult RGB cable tight 1 Change IC600 WAVEFORMS Is Input signal timing and format in spec Change Timing according to product spec Or change format to RGB 2 Is waveform at R628 R630 R634 3 Check Line between P302 and IC600 is open or short Another is Change RGB cable NO YES YES 3 R630 G R634 R R628 B ...

Page 18: ... 18 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 7 Abnormal screen HDMI Main PCBA ...

Page 19: ...02 If 3V is not plus 13 27pin of IC502 check It is over 3V at L501 L504 if it is not Check Line between L712 and IC502 is open or short Another is change IC701 IC502 NO 3 4 YES Is I2C waveform at 23 24pin of IC502 Check Line between IC502 and IC600 is open or short Another is change IC502 or IC600 NO 5 Is I2S waveform at R510 R511 R512 R513 6 Check Line between IC501 and IC600 is open or short Ano...

Page 20: ...at 5pin of TU401 If 4 9V is not at plus pin of L706 check It is over 3V at 2pin of IC706 if it is not Check Line between IC706 and IC600 is open or short Another is change IC706 2 Is I2C waveform At 6 7pin of TU401 3 Check Line between TU401 and IC600 is open or short Another is change IC600 or TU401 4 Is IF waveform at 67 68 pin of IC600 Check Line between TU401 and IC600 is open or short Another...

Page 21: ...ing and service purposes 10 Abnormal sound AV Main PCBA Put into AV cable completely Abnormal sound AV YES NO Insult AV cable tight 1 Change IC600 WAVEFORMS Is waveform at C688 C689 2 Check Line between JK101 and IC600 is open or short Another is change AV cable NO YES C688 C689 audio in 2 ...

Page 22: ...rmat to PCM 2 Is waveform at R319 R320 3 Check Line between JK300 and IC600 is open or short Another is Change HDMI cable NO YES YES Is waveform at R321 R322 R323 R324 R325 R326 YES 4 Check Line between JK301 and IC600 is open or short Another is Change HDMI cable NO Can read EDID and HDCP key though 16 15pin of JK300 Check Line between JK300 and IC600 is open or short Another is Change IC602 or H...

Page 23: ... 23 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes BLOCK DIAGRAM ...

Page 24: ...hanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT S...

Page 25: ...828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright ⓒ 2012 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 26: ...828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright ⓒ 2012 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 27: ...828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright ⓒ 2012 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 28: ...828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright ⓒ 2012 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 29: ...828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright ⓒ 2012 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 30: ...828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright ⓒ 2012 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 31: ...828539 WP_GLOBAL_PFWP_GLOBAL_PF A P C P C W M _4828539 W P _G LO B A L_P F W P _G LO B A L_P F Copyright ⓒ 2012 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

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