LG Electronics 55LA790V/W/9-ZA C. Audio error , LCD TV

46 / 90

Copyright © 2013 LG Electronics. Inc. All rights reserved.

Only for training and service purposes LGE Internal Use Only

→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio

C. Audio error

Wrecked audio/ discontinuation/noise

Wrecked audio/

Discontinuation/

Noise for

all audio

Check and replace

speaker and

connector

Wrecked audio/

Discontinuation/

Noise only

for D-TV

Wrecked audio/

Discontinuation/

Noise only

for Analog

Wrecked audio/

Discontinuation/

Noise only

for External Input

Connect 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

Established

date

Revised date

LCD TV Error

symptom

Standard Repair Process

☞A25

2012. 12 .06

Contents

Main CONTENTS SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE General Guidance Before returning the receiver to the customer, Leakage Current Cold Check(Antenna Cold Check) SERVICING PRECAUTIONS Page SPECIFICATION 1. Application range 2. Requirement for Test 3. Test method 4. Model General Specification Page 5. External input format 5.1. 2D Mode 5.2. 3D Mode (4) HDMI 1.4b (3D supported mode automatically) Page Page ADJUSTMENT INSTRUCTION 1. Application Range 2. Designation 3. Automatic Adjustment 3.1. ADC Adjustment 3.3. LAN Inspection 3.3.1. Equipment & Condition SET PC 3.3.2. LAN inspection solution 3.3.3. WIDEVINE key Inspection 3.6. CI+ Key checking method 3.6.1. Check the method of CI+ Key value 3.6.2. Check the method of CI+ key value(RS232) 3.7. WIFI MAC ADDRESS CHECK 4. Manual Adjustment 4.1. EDID(The Extended Display Identific ation Data)/DDC(Display Data Channel) download 4.1.1. Overview 4.1.2. Equipment 4.1.3. Download method 4.2. White Balance Adjustment 4.2.1. Overview 4.2.2. Equipment 4.2.3. Equipment connection MAP 4.2.4. Adj. Command (Protocol) 4.2.5. Adj. method 4.2.6. Reference (White balance Adj. coordinate and color temperature) 4.2.7. EDGE LED White balance table 4.3. Local Dimming Function Check 4.4. Magic Motion Remote control test 4.5. 3D function test 4.6. Wi-Fi Test 4.7. LNB voltage and 22KHz tone check 4.8. Inspection of light scattering 4.9. Option selection per country 4.9.1. Overview 5. Audio 6. USB S/W Download(Service only) * After downloading, have to adjust Tool Option again. EXPLODED VIEW IMPORTANT SAFETY NOTICE FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC102 R1EX24256BSAS0A I2C PULL UP IC100 LG1154D_H13D NVRAM Debug INSTANT_MODE0 System Configuration LG1154A (2) AFE 3CH Power +2.5V +3.3V_Bypass Cap (1) LG1154A +1.1V_Bypass Cap +0.75V LG1154D BSD-NC4_H002-HD 2012-12-24 LG1154DLG1154A DIMMING NC Placed as close as possible to IC4300 AFE 3CH REF Setting FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC500 2012-09-14 1Gbit : T7(NC_6) H5TQ1G63DFR-PBC(x16) FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS BSD-NC4_H007-HD 2012-10-20 PCMCIA FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS POWER IC2302 AP7173-SPG-13 HF(DIODES) 5A LG1154 IC2300 TPS54327DDAR +5.0V normal & USB DCDC_TI Renesas MICOM THERMAL 87 AVDD12_3 HDMI3 HDMI4 FHD FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS GP4 IC3201 SII9587CNUC HDMI3 COMPONENT 1 PHONE JACK FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS JACK HIGH/MID 2012.10.09 SPDIF OUT CVBS 1 PHONE JACK MAX 0.4A For EMI FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC4200 GL852G-31 CAMERA POWER ENABLE CONTROL USB3_HUB 2012.10.08 USB_Camera OCP USB1 OCP USB2/3 USB2 (2.0) MAX 1.0A USB3 (2.0) MAX 1.0A USB1 (3.0) MAX 1.2A BSD-NC4_H044-HD 2012-11-09 USB JACK FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS Full Scart(18 Pin Gender) BSD-NC4_H048-HD 50 LAN_VERTICAL 2011.12.09 Ethernet Block FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC5200 RTL8201F-VB-CG WOL POWER ENABLE CONTROL ETHERNET Ethernet Block BSD-NC4_H052-HD 2012-09-12 IC5600 TAS5733 Close to Speaker SPEAKER_L GP4_MT5369 58 2011.11.21 AUDIO[ST] Separate DGND AND AVSS This parts are Located on AVSS area. WOOFER_R GP4_MT5369 58 2011.11.21 AUDIO[ST] This parts are Located on AVSS area. Close to Speaker FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC6000 AZ4580MTR-E1 [SCART AUDIO MUTE] SCART AUDIO AMP 2011.11.21 60 EARPHONE AMP 62 CI SLOT 2011.10.31 CI POWER ENABLE CONTROL IC6300 TDA8024TT +5V_NORMAL B-CAS (SMART CARD) INTERFACE FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IF_P 13 20 32 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS TU6705 TDSN-G351D TU_SYMBOL 2012.09.14 TU6702 TDSQ-H651F(B) TU6703 TDSQ-G651D(B) DVB-S2 LNB Part Allegro Max 1.3A (Option:LNB) 2A 3A LVDS BSD-NC4_H072-HD 2012-10-15 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS LOCAL DIMMING 2012.09.14 LOCAL DIMMING 1 [To LED DRIVER] BSD-NC4_H074-HD FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC7701 <LEVEL SHIFTER BLOCK> CH6 CH5 CH4 <POWER BLOCK> THIS IS REVERSE PATTERN !!!! Page FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC8100-*3 KLM2G1HE3F-B001 (Just Interal LDO Capacitor) eMMC eMMC I/F eMMC serial 100 ohm option Page Page EPI Interface EPI(Embedded Point-Point Interface) 3 / 90 EPI Interface (mini-LVDS vs. EPI) -Multiple number of wires needed for higher bandwidth Comparison EPI (Embedded clock P-to-P Interface) HF mini-LVDS EPI Interface (mini-LVDS vs. EPI) Fewer Lines : 12 NFC (Near field communication) LINE OUT Main PCB for Broadband xxLA790V-Zx PCB P/No : EAX65040103 8 / 90 1. H13 Block Diagram (External) H13 LG1154AN H13 LG1154D 9 / 90 LNB 2. LG1154 I2C Map 3. Power Block Diagram 10 / 90 3.5V 12V 24V 4. Tuner/CI Block Diagram LG1154 11 / 90 TDSQ- G651D /PCM_IOWR 5. Video & Audio IN SC_L/R_IN H13 (LG1154AN) COMP2_Y_IN_SOC_SOY 6. AUDIO OUT MAIN 4P wafer AUD_SCK/LRCK/LRCH MICOM OP AMP 7. HDMI 14 / 90 HDMI1 H13D (IC100 / LG1154D) 8. Panel Interface Block Diagram 15 / 90 VCOM_LOOP TX_LOCKN 37 9. PMIC & Level Shift Bloc Diagram 17 / 90 10. USB / WIFI / M-REMOTE / UART RENESAS MICOM LG1154D_H13D OCP OCP Interconnection - 1 LED driver / PSU [PCBs] [Cables] 47LA790V-ZA Interconnection - 2 47LA790V-ZA [Cables] [PCBs] Page 1. System Pairing Information Transmission (Send to TV after Paired) The receiver sends the pairing success packet to TV directly. Voice Data Transmission 22 / 90 2. Remote Buttons (M4 vs. MR13P) RF_CODE M4 Remote MR13P Remote IR_CODE repeat 3. MR13P Block Diagram Power Management Connector 4. Function list Remocon Sensor RF 5. RF Pairing / Un-pairing Method Method Description at the same time for 5 sec. RF Pairing unpairing. Page WIFI Built in assy feature - Pin map Block diagram Page Widevine & HDCP 2.0 & NETFLX Contents 1. Widevine? dowmload by NSU is impossible.) Widevine Key is unique data stored TV for using Widevine. 2. HDCP 2.0 & NETFLIX? 3. DTCP? [Three cryptographic Keys] 4. Changed BOM As-Was Current Contents of LCD TV Standard Repair Process C. Audio error First of all, Check whether there is SVC Bulletin in GCSC System for these model. 35 / 90 Contents of LCD TV Standard Repair Process Detail Technical Manual residual image, light spot Continue to the next page 4 Power Board voltage measuring method A5 condition Contents of LCD TV Standard Repair Process Detail Technical Manual Continued from previous page audio/discontinuation case of audio error 37 / 90 LCD TV symptom A. Video error No video/ Normal audio A5 A1 A5 A28 First of all, Check whether all of cables between board is inserted properly or not. 38 / 90 A5 39 / 90 A. Picture Problem A7 A6 . By using Digital signal level meter . By using Diagnostics menu on OSD A. Picture Problem (DVB-S/S2) A7 S/W Upgrade A6 Normal A. Video error symptom 2012. 12 .06 Color error A8 error? Vertical/Horizontal bar, residual image, light spot For other panel For LGD panel Vertical / Horizontal bar, residual image, light spot, external device color error 44 / 90 B. Power error 2012. 12 .06 "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal symptom A19 C. Audio error A24 A25 LCD TV 46 / 90 abnormal audio/discontinuation/noise is same after Check input signal compared to No audio C. Audio error 2012. 12 .06 symptom Revised date Wrecked audio/ discontinuation/noise D. General Function Problem A27 Y A5 Remote control & Local switch checking D. Function error symptom LCD TV 49 / 90 E. Noise LCD TV 50 / 90 Zoom part with A28 F. Exterior defect symptom LCD TV 51 / 90 G. Network Error - Check ethernet Port LCD TV SVC Y G. CI+ Competibility Error LCD TV Check defect CI slot pin Check its worked CI+ 1.2 or 1.3 Setting Antenna CI information Page A. Video error_No video/Normal audio LCD TV 55 / 90 A. Video error_No video/ Audio LCD TV Check the DC 24V, 12V, 3.5V. 24 Pin (Power Board Main Board) Page Page Page 59 / 90 A. Video error_Video error, video lag/stop <ALL MODELS> A. Video error_Color error Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..) Appendix : Exchange EPI Cable or Main B/D (1) Appendix : Exchange EPI Cable or Main B/D (2) Page Page Source TAB IC Defect Appendix : Exchange the Module (2) Un-repairable Cases In this case please exchange the module. ST-BY Condition: in the main menus. Power On Condition: 67 / 90 24 Pin (Power Board Main Board) B. Power error _No power Check the DC 24V, 12V, 3.5V. LCD TV 68 / 90 Checking method when power is ON B. Power error _No power LCD TV 24 Pin (Power Board Main Board) Page Checking method LCD TV LCD TV D. VCOM Adjustment 1. Case LCD TV 2. Equipment 3. Adjust sequence