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LG HU85LA Service Manual Download Page 23

- 23 -

Copyright © 

 LG Electronics Inc. All rights reserved.

Only training and service purposes.

TROUBLE SHOOTING GUIDE

1. Poor Connection

- Main & DLPC Board Ass’y

Board connection point

Main & DLPC Board Ass’y

6A

7

6B

1

2

3

4

5

8A

9A

9B

8B

10

No.

Circuit Number 

Pin count  Connections 

Symptoms of a bad connection

1

P102

8

PSU

No power

2

P4000

4

IR

Not operate to remote controller. No lighting LED indicator at 

stand-by mode.

3

P5800

4

SPEAKER

No sound

4

P101

12

WIFI

Not operate wifi & bluetooth.

5

P1002

10

JOYSTICK

Not operate Joystick.

6A,6B

P901,P902

4

FAN

Not operate FAN. The projector will be turned off after 10s as 

soon as power on.

7

P104

3

CASE DETECT

If top case is openning, the projector will be turned off after some 

seconds as soon as power on.

8A,8B

P9003,P401

20

DLPC B/D

Not operate FAN. The projector will be turned off after 10s as 

soon as power on.

9A,9B

P9001,P100

54

DLPC B/D

No image. the projector will be turned off after some seconds as 

soon as power on.

10

P1300

20

LD DRIVER B/D

Not operate FAN & No image. The projector will be turned off after 

some seconds as soon as power on.

Summary of Contents for HU85LA

Page 1: ...le 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 P NO MFL71485905 2104 REV00 HU85L...

Page 2: ...ics Inc All rights reserved Only training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 SOFTWARE UPDATE 7 BLOCK DIAGRAM 8 EXPLODED VIEW 9 DISASSEMBLY ASSEMBLY GUIDE 10 TROUBLE SHOOTING GUIDE 23 ...

Page 3: ...ment 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 measured resistance sh...

Page 4: ...ance LGE PROJECTOR test method followed 2 Required other specification Safety UL CSA IEC CE specification EMC FCC ICES IEC CE specification Wireless WIFI module Bluetooth module US 4 Model General Specification No Item Specification Remark Min Typ Max Unit 1 Video input applicable system ATSC NTSC M ATSC 3 0 HU85LA KR Korea ATSC NTSC M 64 256QAM HU85LA NA HU85LS NA US 2 Available channel 1 VHF 02 ...

Page 5: ... 25 17 VESA VGA 4 800 600 37 87 60 31 40 VESA SVGA 5 1024 768 48 36 60 00 65 VESA XGA 6 1360 768 47 71 60 01 84 75 VESA WXGA 7 1152 864 54 34 60 05 80 VESA 8 1280 1024 63 98 60 02 109 00 SXGA Support to HDMI PC 9 1920 1080 67 5 60 158 40 WUXGA Reduced Blanking 10 1920 1080 135 120 297 UDTV 1080P 11 3840 2160 54 24 00 297 00 UDTV 2160P 12 3840 2160 56 25 25 00 297 00 UDTV 2160P 13 3840 2160 67 5 30...

Page 6: ...24 00 63 36 HDTV 1080P 17 1920 1080p 33 71 29 97 79 120 HDTV 1080P 18 1920 1080p 33 75 30 00 79 20 HDTV 1080P 19 1920 1080p 56 25 50 00 148 5 HDTV 1080P 20 1920 1080p 67 43 59 94 148 35 HDTV 1080P 21 1920 1080p 67 5 60 00 148 50 HDTV 1080P 22 1920 1080p 112 5 100 297 00 UDTV 1080P 23 1920 1080p 134 86 119 88 296 70 UDTV 1080P 24 1920 1080p 135 00 120 297 UDTV 1080P 25 3840 2160p 53 95 23 98 296 70...

Page 7: ...ated successfully Projector will be turn off automatically 8 You can eject USB Memory stick after Projector turned off 2 Expert Mode 1 Download the firmware for that model from the LGE site 2 Create an LG_DTV folder at the root of the USB memory 3 Copy the downloaded model s firmware to the LG_DTV folder 4 Turn on your projector and insert the USB memory 5 If the software pop up window appears clo...

Page 8: ...1 USB_ 2 USB2 0 USB_3 HDMI 1 HDMI 2 ARC HDMI_1 2 Tuner I2S LAN SPDIF Joystick Optic EPHY FPGA OSC DDR3 X 4EA Serial Flash OSC Driver IC Slave Flash Driver IC Master Flash LD Driver XPR I F Block XPR Actuator X tal PMD1000 Warping DDR3 X 4EA OSC 5W R G B LD PSU 19V 15V USB C USB Type C Block Serial Flash TEMP Front X tal DLPC B D 435W 8p 24p LD Driver 12V FAN 5EA 1 Block Diagram BLOCK DIAGRAM ...

Page 9: ...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 AR2 300 310 540 120 600 660 530 Main Board 511 510 512 551 553 550 552 100 Fan 541 410 531 590 560 580 400 Bottom case Wifi IR Temp ...

Page 10: ...d turn it over 3 Lift up Top case 4 loosen a screw on LD shield assy 5EA 5 Lift up LD shield assy 6 Loosen a screw on Engine screw 5EA 7 Hold part with hand and lift up Engine 8 Loosen a screw 4EA and lift up Sub shield assy 9 Loosen a screw 4EA and lift up Main shield assy rear case 6FUHZ RRN 10 Loosen a screw 7EA and lift up PSU shield 11 Loosen a screw 1EA and lift up PSU ...

Page 11: ...ue marked part with a screwdriver and then remove the DMD 6 DMD disassembly and new DMD replacement 2 Disassemble 4 Heatsink fixed Screws including Spring 3 Separate DMD Heatsink and leaf spring 4 Carefully lift the PCBA in the direction of the arrow Make the glass surface of the DMD visible while being attached to the DMD and the PCB DMD cable is connected Cable must be removed when replacing DMD...

Page 12: ... Block Be careful not to get smudge on the front of the DMD or to get dust inside the engine Existing Thermal Pad remaining on the Heatsink Block surface should be removed cleanly Attach 4 new thermal pads Thermal Pad P N 4850V00138M 9x3 5x0 5t 4 sheets attached Attach so that the thermal pads do not overlap and stick together ...

Page 13: ...Insert PSU shield and drive a screw 7EA 3 Fix Main shield assy rear case and drive a screw 4EA 4 Insert Sub shield assy and drive a screw 4EA 7 Insert LD shield assy and drive a screw 5EA 8 Assembly Top case 9 Hold part with hand and turn it over 10 Drive a screw at Bottom case top case 12ea 5 Insert Engine holding part with hand 6 Drive a screw 5EA ...

Page 14: ...ing and service purposes Engine structure Engine Module Engine Assy s DMD Source LD Heatsink are assembly by engine company Engine Module P N AFD74370602 Digital Optics AFD74370604 Union Optech 406 323 114 3 UST lens Engine fix Boss 5EA DMD Light source illuminator ...

Page 15: ... DMD FPCB CABLE EAX69067501 2 3 DLPC board Assy EBT66013701 1 4 Gasket MDS64570159 1 5 Gasket MDS64242814 2 6 Screw FAB31843216 4 7 Caution Label MEZ38075828 1 3 1 2 1 MAIN DLPC BD Front Reference line 4 2 Fixing MAIN DLPC BD on the back of ENGINE 5 connect Actuator cable connector 3 Attach between the GASKET SILK on the back of FPC CABLE 5 5 P100 P101 P900 P600 2 2 Check if the cable guide line i...

Page 16: ...B temp joystick IR wifi changing work 1 Temp sensor joystick drive a screw after fix up guide rib and boss 2 IR wifi insert in guide rib Check the connection status after assembly insert in guide rib 5 Check direction CHASSIS ASSY 1 4 insert in guide rib Drive a screw after fix up GUIDE BOSS Drive a screw after fix up GUIDE BOSS 5 5 2 3 ...

Page 17: ...purposes Set assembly PSU BD and shield assembly guide PSU changing work 1 Insert PSU BD and drive a screw 2 Insert PSU shield and drive a screw Check the connection status after assembly PSU Insert to BOTTOM CASE GUIDE BOSS 3 3 3 4 3 PLATE SHIELD Insert to same GUIDE BOSS 1 2 5 3 ...

Page 18: ...e assembly guide Main shield rear case changing work 1 After lift up Main shield assy insert the Rear case Be careful not to damage the terminals 2 Insert Main shield and drive a screw 6 6 5 5 Insert to GUIDE BOSS MAIN ASSY CASE REAR assembly 3 Drive a SCREW No 5 6 CASE 3P P104 4 CASE REAR 2 1 Insert to BOSS and drive a screw ...

Page 19: ... Fixed ENGINE ASSY CASE assembly No Part No Description Qty Specification AFD74370602 Chassis Assembly 1 KR091276 OPTICAL ENGINE HU85L AFD74370601 SVC BOM Part Only AFD74370604 UNION OPTICAL ENGINE HU85L Optical Engine HU85LA AFD74370603 SVC BOM Part Only FAB30011008 Screw Taptite 5 FAB30011002 BRH P 3MM 12mM EBT66013801 Chassis Assembly 1 SUB None HU85LA LD Driver FAB31843216 Screw Machine 4 BRH ...

Page 20: ...case label location air flow direction Work to FAN each position 2 Cushion It is related with noise So be careful It is located in center of FAN FAN MODULE GASKET FERRITE CORE Description Part No 1 2 3 EAL44320708 MDS64155513 6210VH0004B No 3 B A 2 20mm One turn 50mm One turn C 2 1 1 2 2 1 2 2 3 Check Fan label direction arrows direction is label direction A A A B C ...

Page 21: ...D LD driver B D Check the cable connection status after assembly 1 Check the normal cable direction 2 Check the FPCB FFC CABLE s top bottom direction refer to below picture P9003 P9001 P1300 P404 P400 P400 P901 P300 R P200 P100 G B Insert to HARNESS HOLDER P402 P401 P5800 P102 P4000 P101 P1002 P403 P104 P100 P401 ...

Page 22: ...nd service purposes Set assembly cable Keypad Temp joystick IR PSU Check the cable connection status after assembly 1 Check the normal cable direction 2 Check the FPCB FFC CABLE s top bottom direction refer to below picture Joystick IR PSU P201 P200 P90 IR P11 Temp P901 ...

Page 23: ...P101 12 WIFI Not operate wifi bluetooth 5 P1002 10 JOYSTICK Not operate Joystick 6A 6B P901 P902 4 FAN Not operate FAN The projector will be turned off after 10s as soon as power on 7 P104 3 CASE DETECT If top case is openning the projector will be turned off after some seconds as soon as power on 8A 8B P9003 P401 20 DLPC B D Not operate FAN The projector will be turned off after 10s as soon as po...

Page 24: ...r 10s as soon as power on 2 P404 20 DLPC B D Not operate FAN No image The projector will be turned off after some seconds as soon as power on 3 P403 24 PSU Not operate FAN No image The projector will be turned off after some seconds as soon as power on 4A 4B 4C P100 P200 P300 12 8 LD R G B color off P100 GREEN P200 BLUE P300 RED 5 P400 3 TEMP B D The projector will be turned off after some seconds...

Page 25: ... Driver B D Check image Yes Re connect the Cable Yes No No Yes Change Main B D No Check the connecting status of LD cable Re connect the Cable No Yes 20 Pin P9003 Wafer DMD Board Main Board 1 3 4 R9232 PG_OFFSET normal 1 8V abnormal 0V 5 20 GND Check Poor connection Check Poor connection No Change Optic Engine Check the connecting status of 96p cable DMD Re connect the Cable Yes No Check Poor conn...

Page 26: ...rvice purposes Vertical horizontal line Check the connecting status of 96p cable DMD complete Re connect the Cable Yes No Change DLPC B D Check image Change Optic Engine No Yes Vertical line Horizental line Check Poor connection Appendix Image noise vertical horizontal line ...

Page 27: ...o Yes No Change FAN Check operation Change Main B D or LD driver No Yes No Change FAN FAN defect 1 4 SET running check the voltage level of 2pin using Multi meter 1 3 2 0V normal FAN other FAN defect Change Main B D or LD driver Yes Change Main B D or LD driver Check the status of temp sensor NR03 Re install the temp sensor NR03 complete Yes No Yes Check the operation Change Main B D or LD driver ...

Page 28: ...Re connect the cable of Keypad IR or change them No Yes Status The projector will not turn on using the remote controller or joystick FAN does not work and light does not turn on either Test method after fix The projector is turn on normally using the remote controller or joystick complete Yes No Change PSU Change PSU check operating again No Change Main B D No Appendix No power ...

Page 29: ... B D Check the connecting status of speaker cable Change speaker check sound complete No Yes Yes No Re connect the Cable Check sound out Menu Yes Status No sound Test method after fix It is normally adjusted when the volume is adjusted speaker wafer bottom side of MAIN B D Sound out Appendix No sound ...

Page 30: ......

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