LG Electronics 42LT640H-ZA service manual IC501, NTP-7500L

Page 22

IC501

AMP_RESET

R521

C516

10K

1000pF

+3.3V_Normal

50V

50V

22000pF

+24V_AMP

OPT

AUD_MASTER_CLK

C517

L502

R507

3 . 3

BLM18PG121SN1D

OPT

+24V

+24V_AMP

OUT1A 2

OUT1A 1

PVDD1 3

PVDD1 2

PVDD1 1

C519

C521

C523

C525

PGND1A

VDD IO

GND IO

/RESET

0 . 0 1 u F

C515

0 . 1 u F

0 . 1 u F

10uF

C514

BST1A

50V

CLK I

50V

50V

35V

10uF

0 . 1 u F

L501

10V

[ E P ]

16V

CIS21J121

AD

D501

1N4148W

R508

R515

100V

12

12

C501

C502

C506

C508

C510

C512

OPT

C530

10uF

0 . 1 u F

10uF

0 . 1 u F

0 . 1 u F

0 . 1 u F

10V

16V

390pF

50V

50V

10V

16V

50V

48

47

46

45

44

43

42

41

40

39

38

37

C504

1000pF

C503

50V

AGND_PLL

OUT1B_2

C531

100pF

1

36

D502

390pF

50V

50V

1N4148W

R509

R513

AVDD_PLL

OUT1B_1

R505

2

35

100V

12

12

THERMAL

OPT

3.3K

DVDD_PLL

3

34

PGND1B

49

C526

LF

BST1B

22000pF

4

IC501

33

50V

DGND_PLL

5

32

VDR1

NTP-7500L

OPT

GND_1

6

31

VCC_5

C511

10uF

C513

10V

0 . 1 u F

DGND

AGND

16V

7

30

DVDD

8

29

VDR2

C528

C529

C534

SDATA

BST2A

9

28

1uF

1uF

1uF

AUD_LRCH

25V

25V

25V

WCK

PGND2A

10

27

C527

AUD_LRCK

BCK

OUT2A_2

22000pF

11

26

50V

AUD_SCK

SDA

OUT2A_1

AMP_SDA

R503

100

12

25

AMP_SCL

R504

100

13

14

15

16

17

18

19

20

21

22

23

24

+3.5V_ST

C507

C509

33pF

33pF

50V

50V

SCL

/FAULT

MONITOR0

MONITOR1

MONITOR2

BST2B

PGND2B

OUT2B 1

OUT2B 2

PVDD2 1

PVDD2 2

PVDD2 3

+24V_AMP

D503

R510

R514

R502

1N4148W

12

12

R520

100V

10K

R506

10K

OPT

C532

C

100

390pF

R501

C505

50V

10K

B

Q501

1000pF

C520

C522

C524

AMP_MUTE

50V

MMBT3904(NXP)

0 . 1 u F

0 . 1 u F

10uF

C533

390pF

E

50V

50V

35V

D504

50V

C518

1N4148W

R511

R512

22000pF

100V

12

12

50V

OPT

OPT

R522

POWER_DET

0

L505

10.0uH

L506

10.0uH

L503

10.0uH

L504

10.0uH

C535

0 . 4 7 u F

50V

C536

0 . 4 7 u F

50V

C537

0 . 1 u F 50V

C538 0 . 1 u F 50V

C539

0 . 1 u F

50V

C540

0 . 1 u F

50V

SPK_L+

R516

4.7K

SPEAKER_L

R517

4.7K

SPK_L-

WAFER-ANGLE

SPK_L+	4

SPK_L-	3

SPK_R+	2

SPK_R-	1

P501

SPK_R+

R518

4.7K

SPEAKER_R

R519

4.7K

SPK_R-

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.

Copyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposes

EMEA INTERACTIVE

								GP4_MSTAR												2011 . 08 . 21


								AUDIO AMP												2	2 0

LGE Internal Use Only

Image 22

Contents http//eic.lgservice.com READ THE SAFETY PRECAUTIONS IN THIS MANUALhttp//aic.lgservice.com http//biz.lgservice.comSERVICING PRECAUTIONS CONTENTSSAFETY PRECAUTIONS SPECIFICATIONSAFETY PRECAUTIONS IMPORTANT SAFETY NOTICESERVICING PRECAUTIONS Electrostatically Sensitive ES DevicesSmall-Signal Discrete Transistor Removal/Replacement IC Remove/ReplacementReplacement Removal1. Application range SPECIFICATION4. Model General Specification 3. Test methodAnalogD-SUB 15PIN RGB InputRGB-PC HDMI1-DTV/DVI5.1. Component Input Y, CB/PB, CR/PR 5. Video resolutions 2D5.2. RGB Input PC 5.3. HDMI InputPC/DTV PCDVIAfter downloading, have to adjust Tool Option again ADJUSTMENT INSTRUCTIONBoot file Download 1. Application Range3.1. ADC Process 4. Total Assembly line process4.1. Adjustment Preparation 3.2. Function Check4.3 DDC EDID Write HDMI 256Byte 4.4. EDID data4.2. DDC EDID Write RGB 128Byte Manual W/B process using adjust Remote control4.6.1. HI-POT auto-check preparation 4.5. Outgoing condition Configuration4.6. HI-POT Test 4.6.2. HI-POT auto-check5.2. Comand Set 5.1. Signal Table5. Model name & Serial number D/L 5.3. Method & notice6. CI+ Key Download method 6.1. Download ProcedureCI+ Key Value All rights reserved BLOCK DIAGRAMS7LR HalfEXPLODED VIEW 2011 . 08 EMEA INTERACTIVEGP4MSTAR Copyright 2012 LG Electronics. Inc. All rights reservedOLED Step Up regulator 3 . 3V to 5VMAX 250mA THERMAL+1.5VDDR FROM LIPS & POWER B/DPowerDET +3.3VNormalIC501 NTP-7500LCONTROL IR & LED For FHD 60/120Hz 51Pin LVDS Connector30Pin LVDS Connector For HD 60HzNormal MIRROR Pol - changeHDMI2 HDMI1For CEC SIDEHDMI0 . 3 3 u F RGB/SPDIF/PC/HP/USB USBDIODESS7LRDIVXMS10 IC1300-*1 IC1300MX25L8006EM2I-12G W25Q80BVSSIGSI2176ATSC1INPUTH P4RGLOBALTUNERBLOCKSI2156DVB1INPUTH LGDT1001 IC1501PILG1001 A2 Full Scart/ Comp1 EXTSPKCONTROL/DEBUG UART/I2C SWITCHEXTSPK AMP EXTSPK OUTEXTERNALPOWER OUT 5V/12V REAL TIME CLOCKRTCCI Region Option name of this page CI SLOT because of Hong KongSMD GASKET Page Contents of LCD TV Standard Repair Process 1. Trouble ShootingLCD TV A. Video errorMain B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable A2 Check Power Board 24V,12V,3.5V outputNo Video voltages of PowerCheck various BoardBy using Diagnostics menu on OSD Menu→Setup→Manual Tuning A. Picture ProblemBy using Digital signal level meter Signal strength Normal over 30% Signal Quality Normal over 30%and replace Check color by input -External Input COMPONENT -RGB※ Check Link CableVertical/Horizontal bar, residual image, light spot Connect other external device and cableExternal device screen error-Color error Check color condition by input -External Input -Component RGBCheck Power LED B. Power errorStand-By Red Operating white Check Power On ‘”High”POWEROFFABNORMAL1 Check Power Off Starusinstart menuIf Power Off mode is not displayed Check Power B/D voltage POWEROFFCPUABNORMALCheck user menu Speaker off C. Audio errorPower Board Check audio B+In case of External Input signal error Check and fix external device Check audio B+ Voltage 20V orCheck & Repair Cable connection Connector solder D. General Function Problem1. Remote controlR/C operating error Output signalY Check technical Signal information input? - Fix information D. Function errorCheck input signal S/W VersionE. Noise Identify nose typeF. Exterior defect When the signal is strong, use the attenuator -10dB, -15dB, -20dB etc A. Video errorVideo error, video lag/stopMENU -Æ red keycustomer support -Æ signal test -Æ select channel Standard Repair Process Detail Technical ManualALL MODELS 1. Checking method for remote controller for adjustmentPress the IN-START with the remote controller for adjustment VersionA. Video errorColor error You can view 6 types of patterns using the ADJ KeyAppendix Exchange T-Con Board Appendix Exchange T-Con Board Dim Light Appendix Exchange PSULED driverNo Light No picture/Sound Ok A - 3/5Panel Mura, Light leakage Appendix Exchange the ModuleUn-repairable Cases In this case please exchange the module Press damageAppendix Exchange the Module B. Power error Off when on, off whiling viewing 1. Press the IN-START button of the remote controller for adjustment2. Check the entry into adjustment item Entry methodChecking method C. Audio errorNo audio/Normal video1. Press the MENU button on the remote controller 2. Select the AUDIO function of the Menu