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LG M2250D, Service Manual

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LG M2250D Service Manual Download Page 47

ⓒ

LG Electronics. Inc.2011

Established 

date 

Standard Repair Process Detail Technical Manual

Revised 

date 

A1

Error 

symptom

Content

Check LCD back light with naked eye

A. Video 

error_No 

video/Normal audio 

After turning on the power and disassembling the case, check with the naked eye, 
whether you can see light from 4 locations.

<ALL MODELS>

LCD  TV

A1

2011.01.20

Summary of Contents for M2250D

Page 1: ...IS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD11D MODEL M2250D M2250D PHM North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only P NO MFL63642163 1112 REV00 Printed in Korea ...

Page 2: ...opyright LG Electronics Inc All right reserved Only for training and service purposes CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 BLOCK DIAGRAM 15 EXPLODED VIEW 16 SCHEMATIC CIRCUIT DIAGRAM 2 ...

Page 3: ...e 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 w...

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: ...e 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 replaced...

Page 6: ... each parts are followed each drawing and specification by part number in accordance with BOM 2 5 The receiver must be operated for about 5 minutes prior to the adjustment 3 Test method 3 1 Performance LGE TV test method followed 3 2 Demanded other specification Safety CB No Item Specification Unit Remark 1 Panel Size 546 86mm 22 53 inches 2 Panel Type TN 3 Operating Mode Normally White 4 Backligh...

Page 7: ... 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 56 25 50 148 5 HDTV 1080P 14 1920 1080 67 432 59 94 148 350 HDTV 1080P 15 1920 1080 67 5 60 00 148 5 HDTV 1080P 6 RGB Input PC No Resolution ...

Page 8: ...5 HDCP 8 1280 1024 63 981 60 02 108 875 SXGA HDCP FHD model 9 1920 1080 67 5 60 148 5 WUXGA HDCP FHD model 2 PC Mode No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remark 1 720 480 31 469 31 5 59 94 60 27 00 27 03 SDTV 480P 2 720 576 31 25 50 54 SDTV 576P 3 1280 720 37 500 50 74 25 HDTV 720P 4 1280 720 44 96 45 59 94 60 74 17 74 25 HDTV 720P 5 1920 1080 33 72 33 75 59 94 60 74 17 74 2...

Page 9: ...onfig tab 2 Set as below and then click Auto Detect and check OK message If Error is displayed Check connection between computer jig and set 3 Click Read tab and then load download file XXXX bin by clicking Read 4 Click Connect tab If Can t is displayed check connection between computer jig and set 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message USB DOWNLOAD 1 Pu...

Page 10: ...Using power on button of the Adjustment R C power on TV ADC Calibration Protocol RS232 Adjust Sequence aa 00 00 Enter Adjust Mode xb 00 40 Component1 Input 480i ad 00 10 Adjust 480i Comp1 xb 00 60 RGB Input 1024 768 ad 00 10 Adjust 1024 768 RGB aa 00 90 End Adjust mode Required equipment Adjustment R C 3 2 Function Check Check display and sound Check Input and Signal items cf work instructions 1 T...

Page 11: ...alue with its BOM if it is correctly same then unplug the AC cable If it is not same then correct it same with BOM and unplug AC cable For correct it to the model s module from factory Jig model Push the IN STOP key after completing the function inspection And Mechanical Power Switch must be set ON 4 2 DDC EDID Write RGB 128Byte Connect D sub Signal Cable to D sub Jack Write EDID Data to EEPROM 24...

Page 12: ...ID For Analog EDID 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 00 FF FF FF FF FF FF 00 1E 6D a b 10 c 01 03 68 10 09 78 0A EE 91 A3 54 4C 99 26 20 0F 50 54 A1 08 00 81 C0 61 40 45 40 31 40 01 01 30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88 40 35 00 A0 5A 00 00 00 1C 01 1D 00 72 51 D0 1E 20 50 6E 28 55 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A 60 3E 1F 46 10 00 0A 20 20 20 20 20 20 d 70 d 00 e 80 FF FF F...

Page 13: ... or 2 2 kV dc for one second 5 Model name Serial number D L Press Power on key of service remocon Baud rate 115200 bps Connect RS232 Signal Cable to RS 232 Jack Write Serial number by use RS 232 Must check the serial number at the Diagnostics of SET UP menu Refer to below 5 1 Signal TABLE CMD A0h LENGTH 85 94h 1 16 bytes ADH EEPROM Sub Address high 00 1F ADL EEPROM Sub Address low 00 FF Data Write...

Page 14: ...C 4 Check whether the key was downloaded or not at In Start menu Refer to below Check the Download to CI Key value in LGset 1 check the method of CI Key value a check the method on Instart menu b check the method of RS232C Command 1 into the main ass y mode RS232 aa 00 00 2 check the key download for transmitted command RS232 ci 00 10 3 result value normally status for download OKx abnormally stat...

Page 15: ...LGE Internal Use Only Copyright LG Electronics Inc All right reserved Only for training and service purposes 15 BLOCK DIAGRAM ...

Page 16: ...d mechanical 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 IMPORT...

Page 17: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 18: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 19: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 20: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 21: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 22: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 23: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 24: ...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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

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 ⓒ 2011 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 ⓒ 2011 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 ⓒ 2011 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 ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 29: ......

Page 30: ...Trouble Shooting Guide M22 2450D PHM ...

Page 31: ...izontal bar residual image light spot external device color error 5 6 B Power error No power 6 7 Off when on off while viewing power auto on off 7 8 C Audio error No audio Normal video 8 9 Wrecked audio discontinuation noise 9 10 D Function error No response in remote controller key error recording error memory error 10 11 External device recognition error 11 12 E Noise Circuit noise mechanical no...

Page 32: ...tage Y Replace Inverter or module N Repair Power Board or parts End Always check record S W Version and White Balance value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 13 LCD TV Error symptom A Video error No video Normal audio A4 A1 A2 A28 A7 A3 First of all Check whether all of cables between b...

Page 33: ...arious voltages of Power Board 3 5V 12V 19V No Video No audio Check and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A4 Established date Revised date 2 13 LCD TV Error symptom 2 ...

Page 34: ...yer Set Top Box Different maker TV etc SVC Bulletin Replace Main B D Check Tuner soldering Normal Picture Y N Y Close Close By using Digital signal level meter By using Diagnostics menu on OSD Menu Setup Manual Tuning Signal strength Normal over 30 Signal Quality Normal over 30 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N Normal Picture Y Close N Standard Repair P...

Page 35: ...I Y External device Cable normal External Input Component error Check external device and cable Y External device Cable normal RGB HDMI DVI error Check external device and cable Replace Main B D Replace Main B D N N A Video error Color error N Y End Replace module Request repair for external device cable Color error Check Test pattern Standard Repair Process Established date Revised date 4 13 LCD ...

Page 36: ...device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc N Y Replace Main B D Screen normal Check screen condition by input External Input Component RGB HDMI DVI Request repair for external device Component error RGB error HDMI DVI Connect other external device and cable Check normal operation of External Input Compone...

Page 37: ... was inserted properly Check Power LED Replace Power B D Measure voltage of each output of Power B D N Y Normal voltage Replace Main B D N Y OK Replace Main B D N Y Normal Check ST BY 3 5V Replace Power B D N Y Normal voltage Replace Power B D Y A17 A18 A19 A4 Standard Repair Process Established date Revised date 6 13 LCD TV Error symptom 6 Stand By Red Operating white Close ...

Page 38: ...ir Process 7 Status Power off List Explanation Normal POWEROFF_REMOTEKEY Power off by REMOTE CONTROL POWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_REC...

Page 39: ... Check audio B 19V Power Board Normal voltage Y N Replace Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A24 A25 Disconnection Established date Revised date 8 13 LCD TV Error symptom Standard Repair Process 8 ...

Page 40: ...or Analog Wrecked audio Discontinuation Noise only for External Input Connect and check other external device N Y Normal audio Check and fix external device Replace Power B D N Y Normal voltage Check input signal RF External Input signal Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 19V Replace Main B D In case of External Input ...

Page 41: ...light in room Check R C Operating When turn off light in room Check Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check 3 5V On Main B D A27 Normal Voltage Close N N Check 3 5v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A4 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A27 Replace Main B D Y A27 Standar...

Page 42: ... Y N External Input and Component Recognition error Check and fix external device cable RGB HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information D Function error External device recognition error Established date Revised date 11 13 LCD TV Error symptom Standard Repair Process 11 ...

Page 43: ...k noise from the cabinet refer to the KMS fix information and then proceed as shown in the solution manual For models without any fix information provide the description OR Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part related to nose in the Owner s Manual E Nois...

Page 44: ...h exterior damage Module damage Cabinet damage Replace cabinet Replace remote controller Remote controller damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 13 13 LCD TV Error symptom Standard Repair Process 13 ...

Page 45: ...TV Version checking method A7 6 A Video error_Color error LCD TV connection diagram A8 7 Tuner Checking Part A9 8 Check Link Cable LVDS reconnection condition A10 9 Adjustment Test pattern ADJ Key A12 10 A Video error_Vertical Horizontal bar residual image light spot LCD TV connection diagram A8 11 Check Link Cable LVDS reconnection condition A10 12 Adjustment Test pattern ADJ Key A12 13 Appendix ...

Page 46: ...hile viewing POWER OFF MODE checking method A22 21 B Power error_Off when on off while viewing POWER BOARD PIN voltage checking method A19 22 C Audio error_No audio Normal video Checking method in menu when there is no audio A24 23 Voltage and speaker checking method when there is no audio A25 24 C Audio error_Wrecked audio discontinuation Voltage and speaker checking method in case of audio error...

Page 47: ...chnical Manual Revised date A1 Error symptom Content Check LCD back light with naked eye A Video error_No video Normal audio After turning on the power and disassembling the case check with the naked eye whether you can see light from 4 locations ALL MODELS LCD TV A1 2011 01 20 ...

Page 48: ...ual LED driver B 19V measuring method A Video error_No video Normal audio A2 Established date Revised date Error symptom Content LCD TV A2 P901 1 19V 2 19V 3 GND 4 PWM DIM 5 ERROR_OUT 6 WLED_ENABLE 2011 01 20 Edge LED LED Driver main PCBA Check the DC 19V and Inverter on ...

Page 49: ... of item 6 3 After recording the R G B GAIN Cut value of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD Standard Repair Process Detail Technical Manual Check White Balance value A Video error_No video Normal audio ALL MODELS A3 Established date Revised date Error symptom Content LCD TV A3 2011 1 19 ...

Page 50: ... channel When the signal is strong use the attenuator 10dB 15dB 20dB etc Standard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A6 Established date Revised date Error symptom Content LCD TV A6 ...

Page 51: ...l LCD TV Version checking method A Video error_Video error video lag stop 1 Checking method for remote controller for adjustment Press the IN START with the remote controller for adjustment Version ALL MODELS A7 Established date Revised date Error symptom Content LCD TV A7 ...

Page 52: ...s Inc 2011 Standard Repair Process Detail Technical Manual LCD TV connection diagram 1 A Video error _Vertical Horizontal bar residual image light spot A8 Established date Revised date Error symptom Content LCD TV A8 ...

Page 53: ...hen the external device is connected 2 After measuring each voltage from power supply finally replace the MAIN BOARD Standard Repair Process Detail Technical Manual TUNER checking part A Video error_Video error video lag stop ALL MODELS A9 Established date Revised date Error symptom Content LCD TV A9 2010 2 19 ...

Page 54: ...etail Technical Manual Check Link Cable LVDS reconnection condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A10 Established date Revised date Error symptom Content LCD TV A10 1 2011 01 20 ...

Page 55: ...pattern ADJ Key A Video error_Color error You can view 6 types of patterns using the ADJ Key Checking item 1 Defective pixel 2 Residual image 3 MODULE error ADD BAR SCAN BAR 4 Video error Classification of MODULE or Main B D A12 Established date Revised date Error symptom Content LCD TV A12 ...

Page 56: ...on Defect CNT Broken T Con Defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange T Con Board 1 A 1 5 ...

Page 57: ...nc 2011 Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange T Con Board 2 A 2 5 ...

Page 58: ...ⓒ LG Electronics Inc 2011 Appendix Exchange PSU LED driver No Light Dim Light Dim Light Dim Light No picture Sound Ok A 3 5 ...

Page 59: ...s Inc 2011 Appendix Exchange the Module 1 Panel Mura Light leakage Press damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage A 4 5 Un repairable Cases In this case please exchange the module ...

Page 60: ...ct Gate TAB IC Defect Vertical Line Source TAB IC Defect Vertical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 A 5 5 Un repairable Cases In this case please exchange the module ...

Page 61: ...d Repair Process Detail Technical Manual Check front display LED B Power error _No power A17 Established date Revised date Error symptom Content LCD TV A17 Front LED control Menu Æ Option Æ Power Indicator Æ Standby light ON 2011 01 20 ...

Page 62: ...Inc 2011 Standard Repair Process Detail Technical Manual Check power input voltage and ST BY 3 5V B Power error _No power A18 Established date Revised date Error symptom Content LCD TV 2011 1 20 Check 19V out of Adopter ...

Page 63: ...emote controller for adjustment 2 Check the entry into adjustment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A22 Established date Revised date Error symptom Content LCD TV A22 ...

Page 64: ...ller 2 Select the AUDIO function of the Menu 3 Select TV Speaker from Off to On Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A24 Established date Revised date Error symptom Content LCD TV A24 ...

Page 65: ...nd when you touch the GND and output terminal the speaker is normal 3 Check signal input to the Audio amp IC Such as below MCLK master clock 12 288 MHz RESET normal status is high VDD Power LRCLK 48KHz SCLK 3 072MHz Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video ALL MODELS A25 Established date Revised d...

Page 66: ...ion it is normal when the Analog Tester needle moves slowly and defective when it does not move at all Standard Repair Process Detail Technical Manual Remote controller operation checking method D Function error_ No response in remote controller key error ALL MODELS A27 Established date Revised date Error symptom Content LCD TV A27 1 2 3 4 2010 2 19 ...

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