LG Electronics 42LT760H-ZA IR & KEY, Zener Diode is close to wafer

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES

SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.

FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS

ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR

THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

IR +3.5V_ST

+3.5V_ST

R4102

10K

OPT

+3.5V_ST

R4104

47K

R4100 0

Q4100

2SC3052

OPT

EB

C

Q4101

2SC3052

EB

C

R4103

47K

R4101

47K

OPT

C4102

0.1uF

C4100

0.1uF

R4114

100

P4102

12507WR-10L

1

2

3

4

5

6

7

8

9

10

11

D4101

5.6V

AMOTECH

D4100

5.6V

AMOTECH

R4126 1.5K

L4100

BLM18PG121SN1D

C4107

100pF

50V

D4106

5.6V

CDS3C05HDMI1

C4101

0.1uF

16V

D4104

5.6V

AMOTECH

R4124 100

I_SENSOR

C4103

0.1uF

16V

OPT

D4105

5.6V

CDS3C05HDMI1

KEY2

R4123

100

I_SENSOR

KEY1

R4113

100

I2C_SDA2

I2C_SCL2

+3.5V_ST

C4104

1000pF

50V

LED_R

C4108

1000pF

50V

I_SENSOR

C4109

0.1uF

16V

I_SENSOR

C4110

0.1uF

16V

OPT

L4101

BLM18PG121SN1D

I_SENSOR

+3.3V_NORMAL

I2C_SDA3

I2C_SCL3 R4127 100

OPT

R4128

100

OPT

R4132

10K

+5V_ST

IR_OUT_HDMI1

R4136

10K

IR_OUT_CTRL

+5V_ST

R4133

22

R4141

22

R4139

30K

R4143

30K

IR_OUT_RS232C

+5V_ST

R4135

30K

+5V_ST

R4144

10K

R4140

10K

R4137

22

IR_OUT_HDMI2

R4131

22

IR_OUT_HDMI3

R4117

10K

1%

+3.5V_ST

R4118

10K

1%

L4103

BLM18PG121SN1D

L4102

BLM18PG121SN1D

R4107

47K

OPT

R4130

10K

R4134

10K

R4138

10K

R4142

10K

R4108 0

NON_I_SENSOR

R4109

10K

OPT

Q4102

2SC3052 EB

C

Q4103

2SC3052 EB

C

Q4105

2SC3052 EB

C

Q4107

2SC3052 EB

C

Q4108

2SC3052

E

BC

Q4106

2SC3052

E

BC

Q4104

2SC3052

E

BC

IR & KEY

Zener Diode is

close to wafer

41

IR / KEY

2011.09.26

xxLT760H-UA

Copyright © 2012 LG Electronics. Inc. All rights reserved.

Only for training and service purposes

LGE 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)