22LN45XX, 22LN450U, 22LN457U (CHASSIS:LC31A, LD31T) - LG TV Service Manual (repair manual). Page 25

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.

MODULE&CONTROL

Q601

MMBT3904(NXP)

E

B

C

KEY_SDA

R621

10K

IR_OUT

JP603

R617

3.3K

L600

BLM18PG121SN1D

JP604

R614
100

+3.3V_ST

C604

1000pF

IR_OUT

JP607

Q600

MMBT3904(NXP)

E

B

C

KEY2

LED_RED

R600

10K

R602

10K

KEY1

R619
10K

IR_OUT

R615
100

+3.3V_ST

+3.3V_ST

R622
10K

IR_OUT

JP610

D602

20V

OPT

D603

20V

OPT

IR

R601

10K

JP605

R604

270

JP602

C603

100pF

50V

OPT

C600

0.1uF

50V

Q602

MMBT3904(NXP)

IR_OUT

E

B

C

+3.3V_ST

R623

47K

IR_OUT

P600

12507WR-12L

1

2

3

4

5

6

7

8

9

10

11

12

13

JP601

JP609

C602

100pF

50V

OPT

KEY_SCL

R618

22

IR_OUT

Q603

MMBT3904(NXP)

IR_OUT

E

B

C

R620
0

OPT

JP600

D601

20V

JP608

R616

3.3K

R610

330

R628
0

JP611

R629

0

LGD

RXA0-

RXA1+

C605
0.1uF
50V

+12V_PANEL_POWER

R

6

2

6

4

.

7

K

RXA2+

RXA3-

JP612

RXACK-

R

6

2

4

4

.

7

K

RXA2-

R

6

2

5

4

.

7

K

RXA1-

D600

20V

P601

10031HR-30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

RXACK+

RXA0+

R

6

2

7

4

.

7

K

RXA3+

C607
1000pF
50V

C606
10uF
25V

IR_OUT

R603

10K

+3.3V_ST

JP606

IR

C601

1000pF

50V

+3.3V_ST

LED_AMBER

R630
200

6     12

IR/LED and Control

12.07.17
Change D601~3

IR_OUT(Ready)

NC4_S7LRM

2012.04.13
10uF/10V -> 10uF/25V

111116
100uF Ecap
Deletion
EAE38362801

Module 

2012.04.13
1K/10W -> 4.7K/10W 

EAX65077401

2012.09.15

PIN23

LGD

PIN22

NC

VESA

2.7~3.3V

NC

JEDIA

GND

0~0.7V

Amber LED setting : 9.6mA

120915

RED LED setting 
: 9.6->7.9mA

(IR Port protection against ESD)

121018
100ohm->200ohm