LG Electronics 37LT760H-ZA EXTERNAL_POWER OUT 5V/12V

THERMAL

THERMAL

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.

R9102

1.2K

1/16W

C9111

10uF

25V

EXT_5V

R9114

20K

1/16W

1%

L9101

CB3216PA501E

C9106

22uF

25V

L9104

3.6uH

NR8040T3R6N C9103

22uF

16V

R9116

12K

1%

L9103

CB3216PA501E

R9115

100

L9102

BLM18PG121SN1D

P_12V

R9117

200K

1/8W

1%

C9101

22uF

16V

R9108

200

R9100

18K

C9105

470pF

50V

EXT_PWR_DET

EXT_12V

IC9101

MP5000DQ

3

ENABLE/FAULT

2

DV/DT

4

I-LIMIT

1

GND

5

NC 6SOURCE_1

7SOURCE_2

8SOURCE_3

9SOURCE_4

10 SOURCE_5

11

VCC

R9104

43

R9105

100K

IC9102

MP4460DQ-LF-Z

3

EN

2

SW_2

4

COMP

1

SW_1

5

FB 6GND

7FREQ

8VIN_1

9VIN_2

10 BST

11

EP_GND

IC9103

TPS54327DDAR

3

VREG5

2

VFB

4

SS

1

EN

5GND

6SW

7VBST

8VIN

9

[EP]GND

IC9100

APX803D29

1

GND

3

VCC 2RESET

C9112

100pF

EXT5V_CTRL

D9101

A2

CA1

R9113

56K

1%

EXT_5V

C9104

0.1uF

50V

R9110

100K

C9110

0.1uF

50V

R9112

11K

1%

C9107

0.1uF

50V

P_12V

R9107

150K

EXT_12V

C9114

150pF

50V

+24V

R9101

1K

C9109

0.1uF

50V

D9100

MBRA340T3G

R9111

22

L9100

22UH

R9103

10K

C9113 0.1uF

50V

EXT12V_CTRL

C9100

0.1uF

16V

OPT

C9102

3.3uF

50V

R9106

10K

1/16W

1%

R9109

2.4K

P_12V

C9115

3300pF

50V

C9108

1uF

10V

R9118

270K

1/16W

1%

2011.02.09xxLT760H-UA

915V/12V Power Out

EXTERNAL_POWER OUT 5V/12V

close to pin

EXTERNAL_POWER DETECTION

$0.21

close IC1800

Switching noise reducing [MPS recommend]

Vout=(1+R1/R2)*0.765=5.03V

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)