LG Electronics 42LT760H-ZA service manual

Printed in KoreaP/NO : MFL67659801 (1209-REV00)

CHASSIS : LD2FF

MODEL : 42LT760H 42LT760H-ZA

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

LED LCD TV

SERVICE MANUAL

North/Latin America http://aic.lgservice.com

Europe/Africa http://eic.lgservice.com

Asia/Oceania http://biz.lgservice.com

Internal Use Only

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 5. RGB input (PC) 6. HDMI Input 6.1. DTV mode 6.2. PC mode ADJUSTMENT INSTRUCTION 1. Application Range 2. Designation 3. MAIN PCBA Adjustments 3.1. ADC Calibration 3.3. LAN Inspection 3.3.1. Equipment & Condition SET PC 3.3.2. LAN inspection solution 3.4. LAN PORT INSPECTION(PING TEST) 4. Manual Adjustment 4.1. EDID(The Extended Display Identification 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) 4.3. Tool Option selection 4.4. Wi-Fi Test 4.5. HDMI ARC Function Inspection 4.5.1. Test equipment 4.5.2. Test method 5. Check Commercial features 5.1. External SPK Out 5.1.1. Equipment & Condition 5.1.2. Check the speaker out 5.2. IR Out and DC Power Outlet (12V) 6. AUDIO output check 6.1. Audio input condition 6.2. Specification 7. GND and HI-POT Test 7.1. GND & HI-POT auto-check preparation 8. USB S/W Download(Service only) 9. Optional adjustments 9.1. Manual ADC Calibration 9.1.1. Equipment & Condition 9.1.2 Adjust method TROUBLESHOOTING GUIDE 1. Power-Up Boot Fail Trouble Shooting guide 2. No OSD Trouble Shooting guide 3. Analog RF Video Trouble Shooting guide 4. Digital RF Trouble Shooting guide 5. AV Video Trouble Shooting guide 6. HDMI Video Trouble Shooting guide 7. RGB-PC Video Trouble Shooting guide 8. Analog RF Audio Trouble Shooting guide 9. AV / RGB-PC Audio in Trouble Shooting guide 10. HDMI Audio in Trouble Shooting guide BLOCK DIAGRAM DVB T/C R L Side LGE2112 (EU Commercial) S/W HDMI Rear EXPLODED VIEW IC104 M24M01-HRMN6TP 8 MID_MAIN_1 NVRAM Model Option HDCP EEPROM Crystal Matching Test result : 27pF -> 20pF -> 24pF EAX6430790* : LD22* / LC22* EAX6443420* : LT22* / LJ22* / LA22* / LB22* FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2011.09.29 PLACE AT JACK SIDE C333 / C334 / C335 MTK Recommend : 10 pF CH5 CH4 CH2 10 MID_MAIN_3 DECAP FOR SOC (HIDDEN - UCC) PLACE AT MAIN SOC SIDE 2011.11.21 11 MID_MAIN_SCART PLACE AT JACK SIDE PLACE AT IC8602 IC703 IC701 IC704 IC702 DDR ONE SIDE 12 13 2011.09.26 MID_MAIN_CI CI TS INPUT Close to MT5369 Close to MT5369 CI TS OUTPUT On-semi TYP 1450mA +3.3V_NORMAL DDR MAIN 1.5V #16/#20/#23 LD - GND OR USE LE(N.L.D.) - OPEN LE(L.D.) - USE HPD SWITCH NEC_HPD FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS RGB PC 2011.09.29 SPDIF OUT 36 PC AUDIO RS232C HInteractive L Debug MTK CONNECTION IR & KEY Zener Diode is close to wafer 2011.09.26 IR / KEY 41 USB_WIFI DVR Ready MAX 1.8A MAX 0.4A DVR Ready Full Scart [SCART AUDIO MUTE] AR4800 100 1/16W M_REMOTE 2011.06.04 ZigBee_Radio Pulse M_REMOTE OPTION ALL M_REMOTE OPTION 48 MOTION REMOTE xxLT760H-ZA FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC5400 NTP-7500L 0x54 CI POWER ENABLE CONTROL CI SLOT 2011.10.31 62 Option FOR MTK Option FOR LG1152 +3.3V_NORMAL 65 IF_AGC close to Tuner H/NIM for Commercial (EU) Max 240mA [51Pin LVDS OUTPUT Connector] LVDS 2011.08.11 LVDS_HIGH_MID 71 [30Pin LVDS OUTPUT Connector] LOCAL DIMMING [To LED DRIVER] FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC8100-*1 H26M21001ECR SAMSUNG_EMMC_2GB eMMC I/F Dont Connect Power At VDDI (Just Interal LDO Capacitor) FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ETNHUB_DVDD18 To PHY 84Ethernet Hub CONFIG FOR MAC4 EXT_SPK AMP EXT_SPK OUT EXT_SPK OP AMP FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS MICOM MODEL OPTION REAL TIME CLOCK(RTC) SMD GASKET 7.5T SMD GASKET 5.0T SMD GASKET 5.5T SMD GASKET 6.5T SMD GASKET SMD GASKET 9.5T 2011.02.09xxLT760H-UA 88SMD GASKET FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS EMI BETTER Ethernet Block Ethernet PHY TO Ethernet HuB TO SOC/ MCU TO MCU EXTERNAL_POWER OUT 5V/12V $0.21 Vout=(1+R1/R2)*0.765=5.03V FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 27MHz(200ppm) Pro:Idiom (XMARK)