DOWNLOAD LG 42LD550 (CHASSIS:LA02B) Service Manual ↓ Size: 5.54 MB | Pages: 58 in PDF or view online for FREE

- 17 -

(1) Put the USB Stick to the USB socket 
(2) Automatically detecting update file in USB Stick

- If your downloaded program version in USB Stick is Low,

it didn’t work.

But your downloaded version is High, USB data is
automatically detecting

(3) Show the message “Copying files from memory”

(4) Updating is staring.

(5) Updating Completed, The TV will restart automatically
(6) If your TV is turned on, check your updated version and

Tool option. (explain the Tool option, next stage)

* If downloading version is more high than your TV have,

TV can lost all channel data. In this case, you have to
channel recover. if all channel data is cleared, you didn’t
have a DTV/ATV test on production line.

* After downloading, have to adjust TOOL OPTION again.

1) Push "IN-START" key in service remote controller.
2) Select "Tool Option 1" and Push “OK” button.
3) Punch in the number. (Each model has their number.)

- 18 -

300

200

800

520

530

810

910

590

120

500

510

540

400

900

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.

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.

09/10/xx

COMPONENT / AV REAR

1    100

GP2_BCM_ATSC

L104

270nH

REAR_AV_CVBS
11:C4

COMP2_Pr

11:D3

C135

27pF

50V

R104
470K

C127

27pF

50V

L102
270nH

R113

1K

R103
470K

C105
100pF

50V

R110

0

C134
27pF
50V

R131

10

D113
5.6V

COMP1_Pb

11:D4

D116
5.5V

D119
5.6V

R116
2.7K

D3.3V

REAR_AV_DET
9:G3

L103

270nH

D111
5.5V

REAR_AV_R_IN
10:B5

C131

1uF
25V

COMP1_Pr

11:D4

D114
5.6V

C108

100pF

50V

COMP2_R_IN
10:B5

D105
5.6V

C132
1uF
25V

R129

1K

C123

100pF

R109

0

R119
1K

C137
100pF

R125

2.7K

D108
5.6V

C130

100pF

50V

R118
0

C115

100pF

50V

JK100

PPJ237-01

DEV

5J

[GN3]O-SPRING

6J

[GN3]E-LUG

4J

[GN3]CONTACT

7K

[BL3]E-LUG-S

5K

[BL3]O-SPRING

7L

[RD3]E-LUG-S

5L

[RD3]O-SPRING_1

5M

[WH3]O-SPRING

4N

[RD3]CONTACT

5N

[RD3]O-SPRING_2

6N

[RD3]E-LUG

6D

[GN2]E-LUG

5D

[GN2]O-SPRING

4D

[GN2]CONTACT

7E

[BL2]E-LUG-S

5E

[BL2]O-SPRING

7F

[RD2]E-LUG-S

5F

[RD2]O-SPRING_1

5G

[WH2]O-SPRING

4H

[RD2]CONTACT

5H

[RD2]O-SPRING_2

6H

[RD2]E-LUG

6A

[YL1]E-LUG

5A

[YL1]O-SPRING

4A

[YL1]CONTACT

5B

[WH1]O-SPRING

4C

[RD1]CONTACT

5C

[RD1]O-SPRING

6C

[RD1]E-LUG

C113

27pF

50V

D3.3V

C114
27pF

50V

D112
5.5V

R114

470K

D106
5.6V

D118
5.5V

C121

27pF

50V

R105
0

C129
27pF
50V

R108
2.7K

D3.3V

D109
5.6V

C116
1uF
25V

COMP1_L_IN
10:B5

REAR_AV_L_IN
10:B5

C101

1uF

25V

C128
27pF

50V

R123
470K

R127
0

C133
27pF
50V

D117
5.5V

R117
0

R115
470K

D115
5.6V

COMP2_DET

9:G5

C109
100pF
50V

C112

27pF

50V

COMP1_R_IN
10:B5

C124
100pF

R124
470K

L101
270nH

C117
1uF
25V

L100
270nH

COMP1_DET

9:G5

C104

1uF
25V

D104

5.6V

COMP2_L_IN
10:B5

R126

0

C120

27pF

50V

C106
47pF
50V

COMP1_Y

11:D4

C136
100pF

L105

270nH

D110
5.5V

COMP2_Pb

11:D3

C122

27pF
50V

COMP2_Y

11:D3

D107

5.5V

R107

0

R106

0

R100

0

R101

0

R102

10

COMPONENT1

COMPONENT2

AV

REAR AV

COMPONENT/AV
REAR JACK

COMPONENT2

COMPONENT1

REAR AV

COMPONENT2

COMPONENT1

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.

2    100

HDMI_POWER

09/10/xx

GP2_BCM_ATSC

Q200
AO3438

DEV

EBK60752601

G

D

S

R202

10K

D1.8V

C201

4.7uF

OPT

C200

4.7uF
10V

OPT

POWER_ON/OFF2_1

R201
0

R200

120K

OPT

+1.8V_HDMI

HDMI SWITCH 1.8V POWER

1.8V FOR HDMI SW

Seperated from Common sheet83
N.America & Korea only use 1.8V control