DOWNLOAD LG 47LH7000 / 47LH7020 / 47LH7030 (CHASSIS:LD91D) Service Manual ↓ Size: 3.51 MB | Pages: 35 in PDF or view online for FREE

- 17 -

Check P30 0 ,

Can you see t he normal  wavefo rm?

NO

JP300

may have problem. Rep lace th is Jack.

Check th e in pu t o f RGB Audio 

switch (IC405 in  th e Jack Bo ard ) ,

Can you see t he normal  wavefo rm?

Check th e output of RGB Audio 

switch (IC405 in  th e Jack Bo ard ) ,

Can you see t he normal  wavefo rm?

YES

YES

NO

After ch eckin g th e Power of RGB  Audio sw itc h, 

you should  decide to replace RGB  Audio s witch 

or not.

NO

After ch eckin g th e Power of RGB  Audio sw itc h 

you should  decide to replace RGB  Audio s witch 

or not.

Check th e output  of Main IC(IC100).

Esp ecially  you sh ould  ch eck 

The H,V sync  and c loc k.

Can you see t he normal  wavefo rm?

YES

NO

After ch eckin g th e Power of Main  IC(IC100) you 

should decide  to replace Main IC  or not .

This bo ard  has b ig problem becau se Main  

IC(IC100) have some troubles.

Afte r c hecking thoroughly  all path  once  again, 

You sh ou ld decid e to  rep lace Main  Bo ard  or no t.

YES

- 18 -

Check input c onnect  JK600,  JK601, JK602, 

JK60 3

Can you see t he normal  wavefo rm?

Check DD C commu nication  lin es(IC600, 

IC601)

Check th e in pu t o f HDMI Switch (IC600)

This sign al is  TMDS.

Can you see t he normal  wavefo rm?

YES

YES

NO

JK60 0, JK60 1, JK602, JK 603

may have problem. Rep lace th is Jack.

Check th e output of HDMI Switc h(IC600).

Can you see t he normal  wavefo rm?

YES

YES

NO

After ch eckin g th e trace o f TMDS lin es and po wer of 

HDMI Switch,  you should  decide to replace HDMI 

Switch  or not .

NO

NO

After ch eckin g th e Power of th is ch ip , you 

should decide  to replace this or not.

After ch eckin g th e Power of HDMI Switch y ou 

should decide  to replace HDMI S witch or not.

YES

Check HD CP co mmu nicatio n lin es(IC601)

NO

After ch eckin g th e Power of th is ch ip , you 

should decide  to replace this or not.

Check th e output  of Main IC(IC100).

Esp ecially  you sh ould  ch eck 

The H,V sync  and c loc k.

Can you see t he normal  wavefo rm?

YES

NO

After ch eckin g th e Power of Main  IC(IC100) you 

should decide  to replace Main IC  or not .

This bo ard  has b ig problem becau se Main  

IC(IC100) have some troubles.

Afte r c hecking thoroughly all path once  again, 

You sh ou ld decid e to  rep lace Main  Bo ard  or no t.

- 19 -

RGB

COMPONENT

F-SCART

AV3

CLK,ERR,SYN,DATA[0]

CVBS, Y/C

DDR2 SDRAM

(256MB)

IC300

NAND Flash

HYNIX

IC402

URSA_C/D[10bit]

USB

Digital amp

(NTP3100)

IC701

YPbPr

      CVBS

CVBS

I2S

PC RGB, H/V SYNC

FHD 100Hz

Panel

74LVC541A

Buffer
IC502

CI Slot

 (P500)

74LCX244

Buffer
IC501

Address[0:7]

CVBS

URSA_A/B[10bit]

Host Address[0:7]

DDR2 Data[0:15]

DDR2 SDRAM

(128MB)

IC301

DDR2 Data[0:15]

DDR2 Address[0:12]

IC100

(LGE3369A)

FE_TS_DATA[0:7

]

HDMI1

HDMI2

HDMI3

HDMI4

TDA9996

IC600

TMDS[0:7]

H-SCART

SCART-RGB

F-SCART L/R, H-SCART L/R

AV L/R, COMP L/R

TUNER V_OUT

DTV/MNT_V_OUT

DDR2 Address[0:12]

Head 

Phone

FRC

(LGE7329A)

IC900

DDR2 (128MB * 2)

IC1000/1001

 <JACK BOARD >

RS-232C

MAX3232CDR

IC300

SPDIF

SPDIF_OUT

L/R

PC L/R

L/R

L/R

CI_TS_DATA[0:7]

CI_DATA[0:7], Control,

Address[8:14]

EEPROM

AT24C512

TEA6420D

IC405

XC5000

IC102

DRX3913K

IC104

      SIF

TPA6110A

IC700

SERIAL FLASH

IC103

LED A’ssy

IR Assy

& RGB Sensor

Bluetooth

A’ssy

Local Key

MC74HC4006

IC702

DP, DM

DP, DM

L (Audio)

- 20 -

121

300

200

200T

400

805

804

803

801

802

910

900

A10

510

580

570

310

500

806

540

550

560

530

820

122

120

830

200N

A2

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by       in the Schematic Diagram and EXPLODED VIEW. 
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. 
Do not modify the original design without permission of manufacturer.