LG 23MA73D Service Manual Download Page 16 | Manualshive

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LGE Internal Use Only

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LG Electronics. Inc. All right reserved.

Only for training and service purposes

4. No Video - Component

Wave form of C218

Wave form of C220

Wave form of C222

Wave form of Comp Y

Wave form of Comp Pb

Wave form of Comp Pr

Check input signal format

Is it supported?

Check signal

R237,R239,R241

C218,C220,C222

Replace R237,R239,R241

C218,C220,C222

Y

N

Check JK2800

Replace JK2800 or

Check Device

Y

N

Y

IC101 has problem

Y

Check Component Cable

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Summary of Contents for 23MA73D

Page 1: ...tp eic 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 MFL67714439 1301 REV00 23MA73D 23MA73D PUP LA31A LED TV ...

Page 2: ...s Inc All right reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 13 BLOCK DIAGRAM 20 EXPLODED VIEW 21 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ... 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 terminals phone jacks etc If the exposed metallic part has a return path to the chassis the ...

Page 4: ...n 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 b...

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: ... specification Safety CE IEC specification EMC CE IEC specification NOTE Specifications and others are subject to change without notice for improvement 4 General specification 4 1 TV No Item Specification Remarks 1 Market AMERICA CANADA MEXICO 2 Receiving system ATSC NTSC M 64 256 QAM 3 Available Channel 1 VHF 02 13 2 UHF 14 69 3 DTV 02 69 4 CATV 01 135 5 CADTV 01 135 4 Component Input 1EA Y Cb Cr...

Page 7: ...00 12 1280 1024 63 981 60 020 108 000 13 1280 1024 79 976 75 025 135 000 14 1400 1050 65 317 59 978 121 750 15 1440 900 55 935 59 887 106 500 16 1600 900 60 000 60 000 108 000 17 1680 1050 64 674 59 883 119 000 18 1680 1050 65 290 59 954 146 250 19 1920 1080 67 500 60 000 148 500 4 2 RGB PC Specification No Item Specification Remarks 1 Supported Sync Type Separate Sync Digital 2 Operating Frequenc...

Page 8: ... 5 59 94 60 148 35 148 50 HDTV 1080P 5 2 HDMI DTV 5 3 Component No Specification Remark Resolution H freq kHz V freq Hz Pixel clock MHz 1 720 480 15 73 59 94 13 500 SDTV DVD 480I 525I 2 720 480 15 75 60 00 13 514 SDTV DVD 480I 525I 3 720 576 15 625 50 00 13 500 SDTV DVD 576I 625I 50Hz 4 720 480 31 47 59 94 27 000 SDTV 480P 5 720 480 31 50 60 00 27 027 SDTV 480P 6 720 576 31 25 50 00 27 000 SDTV 57...

Page 9: ...X bin by clicking Read 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message USB DOWNLOAD epk file download 1 Make New folder named LG_DTV and put ISP file epk in the folder 2 Put the USB Stick to the USB socket 3 Automatically detecting update file in USB Stick If your downloaded program version in USB Stick is Low it didn t work But your downloaded version is High US...

Page 10: ...I2 2D FHD Check Sum 15BE 3 2 Function Check 3 2 1 Check display and sound Check Input and Signal items cf work instructions 1 TV 2 AV 3 COMPONENT 480i 4 RGB PC 1920 x 1080 60 Hz 5 HDMI1 2 6 PC Audio In Display and Sound check is executed by Remote controller Caution Not to push the INSTOP KEY after completion if the function inspection NO Item CMD 1 CMD 2 Data 0 Enter download MODE Download Mode I...

Page 11: ...me times model name or serial number is initialized Not always There is impossible to download by bar code scan so It need Manual download 1 Press the Instart key of ADJ remote controller 2 Go to the menu Model Number D L like below photo 3 Input the Factory model name ex 27MD73D PZP or Serial number like photo 4 Check the model name Instart menu Factory name displayed ex 27MD73D PZP 5 Check the D...

Page 12: ...on with MHL 4 6 Model Name SW Version Adjust check Press the Instart key of ADJ remote controller 4 6 1 Model Name SW Version Check 1 Check Model Name 2 Check S W Version Refer to the IC Ver in the BOM 4 6 2 Adjust Check 1 Check Country Group 2 Check Area Option 3 Check Tool Option Refer to the BOM Comments 4 Check Adjust ADC Comp RGB is OK 5 Check EDID RGB HDMI1 2 is OK After check all Press the ...

Page 13: ... Check IC802 output Voltage Level 5V Replace IC802 Recheck N Check IC809Output Voltage Level 3 3V_ST Replace IC809 N Y Check IC806 Output Voltage Level 1 15V Replace IC806 Recheck N Y Y Check IC810 Output Voltage Level 2 5V Replace IC810 Recheck N Y Check IC807 Output Voltage Level 1 5V Replace IC807 Recheck N Y Check X201 Clock 24MHz Replace X201 N Check X201 Clock 24MHz Replace X201 N Replace IC...

Page 14: ...h R1127 Check IC101 Replace Main Scaler IC N N Check Panel clock P601 10 11 22 23 Check IC101 Repair Main B D N Check Panel power P1002 1 2 3 5V IC807 Output 5V Replace IC807 N Y Replace T con Board or module Check FFC Cable for damage or open conductors Replace Cable N Y Y Y Check LED Driver output P1101 P1102 1 2 5 6 Check LED Driver IC1100 Replace LED Driver IC N Y ...

Page 15: ...o Check RF Cable Check Tuner TU3700 Data CLK SYN VAL Replace Tuner TU3700 Recheck Y N 1 Check Tuner TU3700 5 Power 3 3V 2 Check IC803 Output voltage 3 3V Replace IC803 Y N Check Tuner TU3700 I2C Signal SCL R2609 SDA R2610 Check IC101 Y N 1 Check Tuner TU3700 7 Power 1 8V 2 Check IC805 Output voltage 1 8V Replace IC805 Y N ...

Page 16: ... Wave form of C218 Wave form of C220 Wave form of C222 Wave form of Comp Y Wave form of Comp Pb Wave form of Comp Pr Check input signal format Is it supported Check signal R237 R239 R241 C218 C220 C222 Replace R237 R239 R241 C218 C220 C222 Y N Check JK2800 Replace JK2800 or Check Device Y N Y IC101 has problem Y Check Component Cable ...

Page 17: ...ve form of R4024 Hsync Wave form of R230 C206 Wave form of R228 C204 Wave form of R232 C208 Check input signal format Is it supported Check Hsync Vsync R266 R267 Replace R266 R267 Check signal RGB R228 R230 R232 C204 C206 C208 N Check JK400 Replace JK400 or Check Device Y N Y Replace R228 R230 R232 C204 C206 C208 N IC101 has problem Y Check RGB Cable Y Y ...

Page 18: ...rvice purposes 6 No Video HDMI Check input signal format Is it supported Y Check JK500 JK501 for proper connection or damage Replace connector Y N Y Check HDMI Cable for damage or open connector Check I2C Signal JK500 JK501 15 16 Re download EDID data Y N Check HDCP Key IC101 Replace Scaler IC101 N ...

Page 19: ...ice support the audio signal normally Check Speaker and its wire connection P700 and the resistance Check Signal from IC700 L700 L701 L706 L709 Y Replace IC700 N 1 Check L800 Voltage Level 19V 2 Check Audio Amp IC700 Power 19V 3 3V Y Replace IC809 3 3V or Adapter N Y Check Signal from IC101 SDA SCL R703 R214 R707 R213 Y Replace IC101 N Replace connector or Speaker N ...

Page 20: ... 20 LGE Internal Use Only Copyright LG Electronics Inc All right reserved Only for training and service purposes BLOCK DIAGRAM ...

Page 21: ...chanical 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 ...

Page 22: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 23: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 24: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 25: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 26: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 27: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 28: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 29: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 30: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 31: ...Copyright ⓒ 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 32: ......

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