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LG 28LM4 0B-PU Series Service Manual Download Page 60

Standard Repair Process Detail Technical Manual

Voltage and speaker checking method 
when there is no audio

C. Audio error_No audio/Normal video

A20

Established 

date 

Revised 

date

Error 

symptom

Content

when there is no audio

date 

①

①

②

1 

SPK_R+FT

2

SPK R-FT

②

<28”>

②

Checking order when there is no audio

1.Check the contact condition of or 12V connector of Main Board

2 

SPK_R FT

3 

SPK_L-FT

4 

SPK_L+FT

<28 >

2.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. 

A20

- 60 -

Summary of Contents for 28LM4 0B-PU Series

Page 1: ...mail facsimile or other electronic means publication modification copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes without limitation any text graphics or logos in this Service Manual ...

Page 2: ... 2 217 176 2019 CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 8 BLOCK DIAGRAM 11 EXPLODED VIEW 12 DISASSEMBLE GUIDE 13 TROUBLE SHOOTING GUIDE 22 ...

Page 3: ...et is safe to operate without damage of electrical shock HDNDJH XUUHQW ROG KHFN QWHQQD ROG KHFN 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 ter...

Page 4: ... Alter natively obtain and wear a commercially available discharg ing 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 buildup or expo sure of the assembly 3 Use ...

Page 5: ...t 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 component and adjacent components and the circuit board...

Page 6: ...tes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification NOM 001 NOM 032 NOM 192 EMI FCC 15 ICES 003 BETS 7 for NAFTA Energy CEC NRCan QUEBEC ONTARIO British Columbia for NAFTA 4 Model General Specification No Item Specification Remarks 1 Receiving System NTSC M ATSC NTSC M ATSC 64 256 QAM USA Only 2 Promramme coverage 1 VHF 02 13 2 UHF 14 ...

Page 7: ...879 60 317 5 1024 768 48 363 60 004 6 1280 720 45 0 60 7 1280 768 47 776 59 870 8 1366 768 49 1 60 79 1 640 480p 31 47 59 94 2 640 480p 31 5 60 00 3 720 480p 31 47 59 94 4 720 480p 31 5 60 00 5 1280 720p 44 96 59 94 6 1280 720p 45 00 60 00 7 720 1440 480i 15 73 59 94 8 720 1440 480i 15 75 60 00 9 720 576p 31 25 50 00 10 1280 720p 37 5 50 00 11 720 1440 576i 15 63 50 00 12 1920 1080i 28 125 50 00 1...

Page 8: ...ith broadcast country setting of user menu If it is applied wrong number customer can not see own country in broadcast country list when initial set Check Area code after change mainboard It should be match with selling country Example Broadcast Country setting of user menu Refer to appendix for details 2019 ...

Page 9: ...oot 2 Insert the USB to the mainboard USB port 3 Then AC on 4 Then the TV will upgrade and need to reboot after upgrade success Upgrading LED indicator blinking red 1000ms green 1000ms alternate TV will turn to upgrade succeed or failed status after finish upgrading Upgrade succeed LED indicator blinking red 250ms green 250ms alternate Upgrade failed LED indicator blinking red 1750ms green 250ms a...

Page 10: ...LGEMS Mexico Mexico Mexico Mexico Mexico Mexico User can select area code by left and right key and set area code with item 5 Set by right and OK key 2 LangGr English 3 TeletextLangGr English 4 CountryGroup Display the subsidiary such LGEUS LGECI and so on 5 Set Select the area code user want and press OK or Right key to set area code and then TV will reboot and the country will change to the coun...

Page 11: ... 2 5 0 11 2019 ...

Page 12: ...These parts are identified by in the 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 200 500 800 HW1 120 120 700 LV1 540 541 400 901 902 A10 AR1 542 ...

Page 13: ... 13 6 66 0 8 2019 ...

Page 14: ... 14 2019 5HPRYH WKH EDFN FRYHU ...

Page 15: ... 15 2019 5HPRYH WKH SRZHU FRUG KRUQ FRQQHFWLRQ DQG UHPRYH ERWK VLGH UDLOV RI WKH PDLQ ERDUG ...

Page 16: ... 16 2019 4 Remove the screwV that lock the main board after removing the mirror line and function key line ...

Page 17: ... 7 2019 5 Remove the tape and unplug the LVDS ...

Page 18: ... 18 2019 6 Remove the tape that holds the speaker line and remove the horn ...

Page 19: ... 19 2019 7 Remove the wall bracket ...

Page 20: ... 20 2019 8 Remove the tape thaW holds the IR plate line and remove the IR plate ...

Page 21: ... 21 2019 9 Place the removed mirror flat on the guard mat ...

Page 22: ...7528 6 227 1 8 22 2019 ...

Page 23: ... G Y Z w V m Z hUG G Z w G VGm Z j G Vo G SG G SG G SG G G G iUGw G u G v G G SG G G SG G G V _ jUGh G u G Vu G GG _ G V V XW y G GMGs G G XW kUGm G XX l G G G G XX XY lUGu j G SG G XY XZ m l l XZ XZ mUGl G l G XZ LUVW RI DOO KHFN ZKHWKHU WKHUH LV 69 XOOHWLQ LQ 6 6 6 VWHP IRU WKHVH PRGHO 23 2019 ...

Page 24: ... audio Check Back Light On with naked eye On Y N Check Power Board 12 5V etc Normal voltage Y N Replace T con Main Board or module R i P Ch k P B d 12 5V t t Move to No video No audio Repair Power Board or parts Check Power Board 12 5V output Normal voltage Y Replace Inverter or module තA18 g N Repair Power Board or parts End ϡPrecaution තA4 A2 Always check record S W Version and White Balance val...

Page 25: ...No video No audio Established date Revised date 2 13 Error symptom Normal voltage Check various voltages of Power Board 12 5V No Video No audio Check and replace MAIN B D Y තA18 MAIN B D Replace Power Board and repair t N End parts 25 2019 ...

Page 26: ...over 50 Signal Quality Normal over 50 Y N Normal Signal Check whether other equipments have problem or not By connecting RF Cable at other equipment DVD Player Set Top Box Different maker TV etc A4 N Check RF Cable Connection 1 Reconnection 2 Install Booster Check S W Version SVC Bulletin Check Tuner soldering Y Y Close Normal Picture Y N ත A4 N S W Upgrade Replace Normal Picture N Contact with si...

Page 27: ... input External Input AV HDMI තA6 N Y Replace module Color error ත A7 N contact condition N Check error color input mode N End External device Cable normal Y Check external device and cable Replace Main T con B D N Check Test pattern තA8 External Input Component error N N Request repair for external device cable Y HDMI error Check external device and cable Replace Main T con B D N External device ...

Page 28: ...Check Test pattern For other panel External device screen error Color error Check screen condition by input Check S W Version N Check External Component Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern N Y Replace Main T con B D Screen normal condition by input External Input Component HDMI DVI Check S W Version Y...

Page 29: ...18 Power LED Normal operation N y p g y On Remote control Y On High Check Power cord was inserted properly LED Power B D Replace Main B D තA18 Stand By Red or Turn On Operating Turn Off On operation Measure voltage of each output of Power B D N Normal තA18 N Y Replace Main B D Y Check ST BY 3 3V Y Normal voltage Y තA18 Close Normal voltage Replace Power B D N Replace Power B D B D 29 2019 ...

Page 30: ...E N Ch k A C d Check outlet If Power Off mode is not displayed Ch k P B D Y Replace Main B D Normal තA18 Error Y Check A C cord Check for all 3 phase power out Check P Power B D voltage N Replace Main B D voltage Replace Power B D ϡ Caution Check and fix exterior of Power B D Part Fix A C cord Outlet and check each 3 phase out 30 2019 ...

Page 31: ... Process No audio Screen normal Check user menu Speaker test No sound Y N Check audio 12 5V of Power Board Normal voltage Y N තA19 තA20 A18 Adjust Volume or mute to unmute Replace Power Board and repair parts Check Speaker disconnection N Y Replace MAIN Board End Disconnection Replace Speaker 31 2019 ...

Page 32: ... Y Check audio B Voltage 12 5V N Discontinuation Noise for all audio N voltage signal Replace Main B D N Wrecked audio Discontinuation Noise only for D TV Replace Power B D When RF signal is not received Request repair to external cable ANT provider Replace Main B D End Wrecked audio Discontinuation Noise only for Analog N In case of External Input signal error Check and fix external device Wrecke...

Page 33: ...tion Normal operating Y Check R C Operating Check Replace Cable connection Connector solder Normal operating Check B B 5V On Main B D Normal Voltage Close Check 5V on Power B D තA18 Check I IR Output signal Normal Signal N Repair Replace IR B D N Normal operating Close If R C operate Explain the customer cause is interference When turn off light in room Baterry of R C Replace Power B D or Replace ...

Page 34: ...hnical Y Check technical information Fix information S W Version N Y Check input signal Signal input Y N Replace Main B D External Input and Component Recognition error HDMI Technical information Check and fix external device cable Replace Main B D Fix in accordance with technical information HDMI DVI Optical Recognition error 34 2019 ...

Page 35: ...n upgrade the S W or provide the description OR ϡ Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage ϡ If there is a Tak Tak 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 agree apply the proce...

Page 36: ...ablished date Revised date 13 13 Error symptom Standard Repair Process Zoom part with exterior damage Replace module Module damage Replace cabinet Cabinet damage Replace remote control Remote control damage Replace stand Stand dent 36 2019 ...

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Page 43: ...ODJ VWRS VWDEOLVKHG GDWH 5HYLVHG UURU V PSWRP RQWHQW GDWH GDWH 28 Checking method 1 Check the signal strength or check whether the screen is normal when the external device is connected 2 2 A Aft fter measuri ing each h volt ltage f from power suppl ly fi finall lly repl lace t th he M MAIN AIN B BOARD OARD ...

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Page 58: ...l Manual Revised date A18 Error symptom Content Check power input voltage B Power error _No power date Backlight Symbol Values Unit Forward Voltage Min Typ Max 28 29 31 5 34 28 VF 29 31 5 34 Vdc 32 34 8 37 8 40 8 43 69 6 75 6 81 6 28 Check the DC 12V A18 58 ...

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Page 60: ...date Error symptom Content when there is no audio date 1 SPK_R FT 2 SPK R FT 28 Checking order when there is no audio 1 Check the contact condition of or 12V connector of Main Board 2 SPK_R FT 3 SPK_L FT 4 SPK_L FT 28 2 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 A20 60 ...

Page 61: ... LED Pin Pin name 1 K0 2 5V 3 IR yp 3 IR 4 GND 5 R 6 G Front Rear PIN1 Checking order to check remote control Checking order 1 Check IR cable condition between IR Main board Check picture number and 2 Check the standby 5V on the terminal 2 pin Checking order to check remote control y p 3 AS checking the Pre Amp IR LED light the power is in ON condition the LED light will be flashing 3 times otherw...

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Page 64: ...o mode 8 EYE Green Eye test OSD Green Eye value display 9 IN START TV set information Model S W version results 10 ADJ Adjust menu 11 MENU U 11 MENU User menu 12 EXIT Exit 13 Arrow 14 ඔ Arrow ඔ 15 OK OK 16 ඖ Arrow ඖ 17 Arrow 18 VOL Volum up 19 VOL Volum down 20 MUTE M t 20 MUTE Mute 21 INSTOP Factory Reset 22 CH Chanel Up 23 CH Channel down 24 1 Number 1 25 2 Number 2 26 3 Number 3 27 4 Number 4 2...

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Page 67: ...HYLVHG GDWH UURU V PSWRP RQWHQW GDWH RS WKH VRIWZDUH LQ WR WKH 86 URRW 67 2019 Check software upgrade bin file name as below Only bin file name is the same as TV set USB upgrade can be success Need do AC on upgrade as below steps Region Model Software Name FY2019 Nafta 28 LM_NAF_3553 bin ...

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