LG 32LJ550B Service Manual

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LED TV

SERVICE MANUAL

CHASSIS : LA75M

MODEL : 32LJ550B

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL69920608 (1702-REV00)

Internal Use Only

32LJ550B-UA

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Summary of Contents for LG 32LJ550B

Page 1 Internal Use Only LED TV SERVICE MANUAL CHASSIS : LA75M MODEL : 32LJ550B 32LJ550B-UA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69920608 (1702-REV00)
Page 2 SOFTWARE UPDATE ................8 BLOCK DIAGRAM ................... 9 EXPLODED VIEW .................. 11 .................. 12 DISASSEMBLY TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 3 An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 5 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. - 5 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 6 Temp : 0 ~ 40 deg Humidity : ~ 80 % Storage Environment Temp. : -20 ~ 60 deg Humidity : ~ 85% - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 7 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 67.43 59.94 148.352 HDTV 1080P 1920*1080 67.50 60.00 148.50 HDTV 1080P - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 8 (8) After TV turned on, Check the updated SW Version and Tool Option (6) Turn OFF the TV and On. Check the updated SW Version and Tool Option - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 11 Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 15 Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 16 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 17 Check and Normal voltages of Power replace No Video/ voltage? Board (13V…) No audio MAIN B/D Replace Power Board and repair parts LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 18 1. Reconnection S/W Upgrade Normal Contact with signal distributor or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 19 Request repair for external device/cable Check external External device device and Replace Main/T-con B/D HDMI /Cable cable error normal LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 20 Screen (Check normal operation of normal? Main /T-con External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 21 Measure voltage of each output of Power B/D Normal? ※ Normal Replace Main B/D voltage? Normal Close Check ST-BY 7.8V voltage? ☞A18 Replace Power B/D Replace Power LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 22 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 23 Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 24 Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 25 (Power B/D don’t have problem) If R/C operate, Normal Close Explain the customer operating? cause is interference from light in room. Replace R/C LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 26 1pin Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value is “NG”? Close Change the Wifi assy LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 27 - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 28 KMS fix information and Manual. then proceed as shown in the solution manual (For models without any fix information, provide the description) LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 29 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 30 Defected Type caused by T-Con/ Exchange Power Board (PSU) A-3/5 Inverter/ Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Continue to the next page LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 31 Motion Remote operation checking D. Function error method Wifi operation checking method Camera operation checking method Not Used E. Etc Tool option changing method LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 32 <32LJ550B-UA> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 33 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. (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 34  All Setting  Channels Channel Tuning Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 35 Content date <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 36 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 37 Revised Content Connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 38 Content Check Link Cable(VX1) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 39 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!) LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 40 Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack A - 1/5 LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 41 Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION A - 2/5 LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 42 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 43 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk A - 4/5 LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 44 Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect A - 5/5 LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 45 B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition: On or Off Power ON condition: Turn Off LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 46 Established B. Power error _No power symptom date Revised Content Check power input voltage and ST-BY 3.5V date Check the DC 13.2V. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 47 <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 48 1. Press the Setting button on the remote control 2. Select the Sound function of the Menu 3. Select the Sound Out 4. Select TV Speaker LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 49 3.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. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 50 3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. LGE Internal Use Only Copyright 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes...
Page 51 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date < 32LJ550B-UA> : WiFi AC only P4001 +3.4V_WIFI WIFI_DM ① Wifi Assy Front WIFI_DP WOL/WIFI_POWER_ON +3.4V_WIFI ② Wifi Assy Rear I2C_SDA_EYE I2C_SCL_EYE ③...

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