LG 49MS75A Service Manual Download Page 58

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Checking order

1. Check IR cable condition between IR & Main board
2. Check the st-by 3.5V on the terminal M1.
3. When checking the Pre-Amp when the power is in ON condition, 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

A27

Established

date

Revised
date

Error

symptom

Content

A27

JK1401

GND

+3.5V_ST

SCL

SDA

JK1401

[MS75A Model]

Signage Monitor

LGE Internal Use Only

Summary of Contents for 49MS75A

Page 1: ...c lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO CHASSIS MODEL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL MFL67237405 1412 REV00 49MS75A 49MS75A 5BB LW43B MONITOR SIGNAGE ...

Page 2: ...ll rights reserved Only for training and service purposes CONTENTS CONTENTS 2 PRECAUTION 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 8 BLOCK DIAGRAM 15 EXPLODED VIEW 16 SCHEMATIC CIRCUIT DIAGRAM APPENDIX TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ... 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 or inverter circuit must disconnec...

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: ...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: ...IEC 4 General Specification No Item Content Remark 1 HDMI Input 2EA HDMI Rear support D TV PC resolution 2 DVI Input 1EA DVI 3 DP Input 1EA Output 1EA DP Rear support D TV PC resolution 4 Audio Input 1EA DVI Audio L R Input 5 OPS Input 1EA OPS Open Pluggable Specification Built in PC Optional Docking Port OPS Kit Accessory 6 Speaker Output 1EA Compatible with common speaker 10W 2Ch Output 7 IR Bri...

Page 7: ...1800 1366 72 144 216 1366 x 768 V Lines 60 795 768 1 3 23 6 H Pixels 108 0 63 981 1688 1280 48 112 248 1280 x 1024 V Lines 60 02 1066 1024 1 3 38 7 H Pixels 146 25 65 290 2240 1680 104 176 280 1680 x 1050 V Lines 59 954 1089 1050 3 6 30 8 H Pixels 148 5 67 5 2200 1920 88 44 88 1920 x 1080 V Lines 60 1125 1080 4 5 46 5 Signal Timing Supporting Resolution 5 1 DVI HDMI Display Port PC Mode 5 2 HDMI D...

Page 8: ...13ch and or Cross hatch pattern 09ch there can some afterimage in the black level area 3 Adjustment items 3 1 Main PCBA Adjustments MAC Address Download 1 ADC adjustment Digital Only does not apply 2 EDID DDC Download 3 MAC Address Download Remark Above adjustment items can be also performed in Final Assembly if needed Adjustment items in both PCBA and final assembly stages can be checked by using...

Page 9: ...r LAN Port Jack 3 Play Test F9 button and confirm OK Message 4 Remove LAN cable 4 5 Serial number download Connect Bar Code scan equipment and set by RS 232C cable 1 E2PROM Data Write 2 E2PROM Data Read 4 6 EDID DDC Download EDID PCM 4 6 1 Overview It is a VESA regulation A PC or a MNT will display an optimal resolution through information sharing without any necessity of user input It is a realiz...

Page 10: ...nce adjustment Keep power on status don t power off 5 1 1 2 Adj condition and cautionary items 1 Lighting condition in surrounding area surrounding lighting should be lower 10 lux Try to isolate adj area into dark surrounding 2 Probe location Color Analyzer CA 210 probe should be within 10cm and perpendicular of the module surface 80 100 3 Aging time After Aging Start Keep the Power ON status duri...

Page 11: ... EXIT key on Remote controller If internal pattern is not available use RF input In EZ Adj menu 6 White Balance you can select one of 2 Test pattern ON OFF Default is inner ON By selecting OFF you can adjust using RF signal in 206 Gray pattern 5 1 5 3 Adj condition and cautionary items 1 Lighting condition in surrounding area Surrounding lighting should be lower 10 lux Try to isolate adj area into...

Page 12: ...KAGE CURRENT At 0 5mArms 8 EYE Q Green Inspection 8 1 Method 1 Connect the Power and IR Brightness Sensor cable to the set 2 Turn on the Signage SET 3 Press P Only Exit EYE Button on the adjustment of R C 4 Green Eye Check Box on the screen after 3 seconds 5 Cover the IR Brightness Cable Assy with your hands hold it for 3 second 6 If normal operation is indicated the OK on the screen 7 If the NG r...

Page 13: ...Sensor Cable on the set 4 Turn on the Signage SET 5 As follows the remote control operation a Press P ONLY on the adjustment of R C b Press EXIT on the adjustment of R C c Press EYE Button on the adjustment of R C Please Check the R G B pattern on the Screen Check the sensor data on the screen Please check RGB Sensor Check On the screen OK Pass NG Fail Re Run Power Cord Connection IR Brigntness Ca...

Page 14: ...min of signal reception Then select 7 External ADC And Press OK or Right Button for going to sub menu 5 Press OK in Comp 480i menu 6 Give a 1080p Mode Horizontal 100 Color Bar Pattern to Comp1 MSPG 925FA Model 225 Pattern 65 7 Press OK in Comp 1080p menu 8 If ADC Comp is successful ADC Component Success is displayed 9 If ADC calibration is failure ADC Component Fail is displayed 10 If ADC calibrat...

Page 16: ...nical 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 Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE ...

Page 17: ......

Page 23: ...LYESTER 1 EA POLYESTER 100 FR FIRE RESISTANCE GRAY 200UM 30mM 120mM SERVEONE CO LTD Wearing the Wrist strap while the working Using the clean gloves None pollution Scrub the tape about 2 3 timesfor protecting come off the tape Be careful the taping position 49MS75A 1 1 1 1 1 2 Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 25: ...6 Off when on off while viewing power auto on off 7 7 C Audio error No audio Normal video 8 8 Wrecked audio discontinuation noise 9 9 D Function error Remote control Local switch checking 10 10 External device recognition error 11 11 E Noise Circuit noise mechanical noise 12 12 F Exterior error Exterior defect 13 First of all Check whether there is SVC Bulletin in GCSC System for these model 7 Cop...

Page 26: ...ways 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 Signage Monitor Error symptom A Video error No video Normal audio A4 A1 A2 A7 A3 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D Power Cable F...

Page 27: ...place 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 Error symptom 9 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 28: ...vice and cable Y External device Cable normal DP DVI error Check external device and cable Replace Main B D Replace Main B D N N A Video error Color error A8 N Y End Replace module Request repair for external device cable Color error Check Test pattern A12 A10 Standard Repair Process Established date Revised date 4 13 Error symptom 10 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right r...

Page 29: ...necting Jig pattern Generator Set top Box etc N Y Replace Main B D Screen normal Check screen condition by input External Input HDMI DP DVI Request repair for external device RGB error HDMI DP DVI error Connect other external device and cable Check normal operation of External Input Component and HDMI DVI DP by connecting Jig pattern Generator Set top Box etc Replace Main B D Screen normal N Y Che...

Page 30: ...asure voltage of each output of Power B D N Y Normal voltage Replace Main B D 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 A18 A19 A4 Standard Repair Process Established date Revised date 6 13 Error symptom Close 12 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal...

Page 31: ... 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_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Download POWEROFF_UNKNOWN Power off by unknown status except listed case Abnormal POWEROFF_ABNORMAL1 Power off by abnor...

Page 32: ...epair 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 Error symptom Standard Repair Process 14 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 33: ...t 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 24V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D N End Establishe...

Page 34: ...ection Connector solder Normal operating Check B 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 Standard Repair Process Established date Revised date 10 13 Error symptom 16 Y 1 Remote control R C operating error Sig...

Page 35: ...cable HDMI DP 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 Error symptom Standard Repair Process 17 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 36: ...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 Noise Circuit noise mechanical noise Established date Revised date 12 13 Error ...

Page 37: ...e controller Remote controller damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 13 13 Error symptom Standard Repair Process 19 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 38: ...7 6 LCD TV connection diagram A8 7 Check Link Cable LVDS reconnection condition A10 8 Adjustment Test pattern ADJ Key A12 9 A Video error_Vertical Horizontal bar residual image light spot Check Link Cable LVDS reconnection condition A10 A11 10 Adjustment Test pattern ADJ Key A12 11 Appendix Defected Type caused by Main Inverter Module Exchange LED driver Board PSU A 3 5 12 Exchange Module itself 1...

Page 39: ...ewing POWER OFF MODE checking method A22 17 C Audio error_No audio Normal video Checking method in menu when there is no audio A24 18 Voltage and speaker checking method when there is no audio A25 19 D Function error_ No response in remote controller key error Remote controller operation checking method A27 Continued from previous page Copyright ⓒ 2015 LG Electronics Inc All right reserved Only fo...

Page 40: ...ht 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 module holes All MODELS A1 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 41: ...or symptom Content A2 Check the DC 24V 24 Pin 2 3 4 24V 1 Measure DC 24V applying to inverter PCB from Power Board 2 Output 24V from Power Board supply to inverter PCB Check Pin contacting statement and connection statement Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 42: ...hite Balance value A Video error_No video Normal audio ALL MODELS A3 Established date Revised date Error symptom Content A3 Entry method 1 Press the ADJ button on the remote controller for adjustment 2 Enter into White Balance of item 10 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 Signage Monitor Copyright ⓒ 2015 LG El...

Page 43: ... 19 12V 20 PWM 1 21 12V 22 PWM 2 23 N C 24 ERROR Standard Repair Process Detail Technical Manual Power Board voltage measuring method A Video error_No video Audio A4 Established date Revised date Error symptom Content A4 Check the DC 3 5V 12V 24V Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 44: ... 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 A7 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 45: ... residual image light spot As the part connecting to the external input check the screen condition by signal A8 Established date Revised date Error symptom Content A8 MS75A Signage Monitor HDMI2 OPS Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 46: ...ideo error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A10 Established date Revised date Error symptom Content A10 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 47: ...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 A12 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 48: ...er 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 LVDS Cable or Main B D 1 Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 49: ...ection Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange LVDS Cable or Main B D 2 Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 50: ...icture Sound Ok Appendix Exchange Power Board No Light Dim Light Dim Light Dim Light A 3 5 Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 51: ...s damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage A 4 5 Un repairable Cases In this case please exchange the module Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 52: ... 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 Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 53: ...ter On 19 12V 20 PWM 1 21 12V 22 PWM 2 23 N C 24 ERROR 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 A18 Check DC 3 5V Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 54: ...2V 20 PWM 1 21 12V 22 PWM 2 23 N C 24 ERROR Standard Repair Process Detail Technical Manual Checking method when power is ON B Power error _No power A19 Established date Revised date Error symptom Content A19 Check power on Pin 1 pin is high about 3 3V Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 55: ...andard 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 A22 Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 56: ...p 4 Select 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 A24 Signage Monitor 5 Sec Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 57: ...Power Board If there is no input voltage remove and check the connector Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video A25 Established date Revised date Err...

Page 58: ...en 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 A27 Established date Revised date Error symptom Content A27 JK1401 M7 GND M4 3 5V_ST M3 NC M1 IR M6 SCL M5 SDA JK1401 MS75A Model Signage Monitor Copyright ⓒ 2015 LG Electronics Inc All right reserved Only for training a...

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