LG 42LG60 Diagram

Left

Backlight

Plug

42LG60 CIRCUIT INTERCONNECT DIAGRAM

TFT PANEL

LD1 Blue LED TFT Drive PWB Check

SET 0FF

LED OFF Anode Cathode0V0V

The appearance of LD1 when the set is on appears to be lit dimly.

However there is a small hole in the back panel frame and the

T-CON PWB that allows the backlight to make it appear lit.

BOOT OK

LED ON Anode Cathode

11.6V0VAnode

SET ON

LED OFF

Cathode

11.6V

9.5V

CN5 CN4

U15

U16

TFT-Drive (T-CON)

P2 "SMPS" to P801 "Main PWB"

Odd Pins

Pin Label STBY Run

1 16V 0V 16V 3 Gnd Gnd Gnd 5 12V 0V 11.8V 7 Gnd Gnd Gnd

95V5V5.15V 11 5V 5V 5.15V 13 Gnd Gnd Gnd 15 Gnd Gnd Gnd 17 ERR 3.19V 3.3V 19 PWR 0V 2.86V 21 ADIM 0.1V 1.68V 23 SEL 0V 3.2V

PDIM Pin 22 can vary according to OSD Backlight

1st” short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K resistor. This turns on the power supply.

: To test the Backlights, jump Pin 20 (INV) to Pin 19 (PWR) Observe the Backlights. If normal, the backlights should turn on and off 4 times. Then they go off. If only ½ the backlights light, (Right side or Left Side), confirm connectors are OK. If yes, panel defective. If no backlight activity, confirm the Fuse F700 has approx. 300V on both sides. If on one side, check fuse for open.

10K

If no 300V, replace Power Supply. If 300V present, observe the center leg on the left hand side of ballast transformer T701. Look for 45Khz pulse at 8.7V p/p. If yes, confirm connectors to backlight OK, if OK, then panel defective. If no pulse, replace the Power Supply.

setting. 0.9V 0% to 3.3V 100%

Pin Label STBY Run

2 16V 0V 16V 4 Gnd Gnd Gnd 6 12V 0V 11.8V

8 Gnd Gnd Gnd 10 5V 5.15V 5.15V 12 5V 5.15V 5.15V 14 Gnd Gnd Gnd 16 Gnd Gnd Gnd 18 ACD 4V 4.57V 20 INV 0V 3.29V 22 *PDIM 0V 3.38V 24 SYNC 0V 0V

Pins 17, 23 and 24 Not Used

Pin 21 is a Fixed Voltage

IC108

IC108 5 (1.2V) 4 (1.3V) 3 (0V) 2 (3.37V) 1 (3.29V)

CN1 CN2

P103 P104

IC103

IC102

IC109 IC110

IC109 5 (0V) 4 (1.79V) 3 (0V) 2 (3.36V) 1 (3.29V)

US1

3.2V

1.8V

UC1

3A 125V

11.6V

LVDS

X101

20.25Mhz

IC101

TRU-MOTION

IC110 5 (2.5V) 4 (0V) 3 (0V) 2 (3.3V) 1 (3.37V)

LD1

P101

P102

FRONT SIDE OF MAIN PWB

5V Switching Regulator

In from IC806 1 8.95V In 6,7,8,10 5V 1 0V Source C ST-5V On/Off 2 3.3V Out 1,2,3,4,5 2.6V Out 2 3.3V Control B RL-ON (PWR) Out (+5V-TU) 3 5.0V On/Off 17

n/c 4 0.0V

Gnd 5 0.0V

In (+12V) 1 11.6V In 6,7,8,10 5V On/Off 1 Power Control-3.3V Out 3 Low to High to B Q400

Gnd 2 0.0V Out 1,2,3,4,5 1.2V Out 3 9V On/Off 17

Gnd

Out 2 3.3V Function Pin Volts Name

In 3 5V In 3 5V ST_+5V

IC800

Function Pin Volts Function Pin Volts Name Function Pin Volts Function Pin Volts

IC806 IC820

9V Regulator

Function Pin Volts Function Pin Volts Name Out 4 3.3V (A3.3V-BCM) Gnd 2 0.0V

IC404

3.3V Regulator

Function Pin Volts Out 2 1.8V (+1.8V-NTP) Control B LVDS-Panel-Control

1 0V Gnd 1 Gnd E 0V

2.6V Switching Regulator A2.6V-BCM

Use L801 left side to test output Use any top pin of IC807 to test input

1.2V Switching Regulator A1.2V-BCM

Use L014 left side to test output Use any top pin of IC820 to test input

Out 2 3.3V Reset Function Pin Volts Function Pin Volts Gnd 1 0V Gnd In C ST-5V Source 1, 3 12V

IC807

IC404 uP 3.3V

3.3VST-MICOM

Power Control

IC802 (On Back)

3.3V Regulator

Gnd

In 3 5V Gnd E 0V

IC805 (On Back)

3.3V Switching Regulator A3.3V-BCM

Function Pin Volts Function Pin Volts

In 2 5V In 1 3.3VST-MICOM

IC810 (On Back)

1.8V Switching Regulator +1.8V-NTP

Function Pin Volts Function Pin Volts

In 3 3.3V from IC802 Source C 12V

Q802 (On Back)

5V Switch control to Q801

Control B RL-ON (PWR) Control 2, 4 Low from Q902 Gnd E 0V Output 5~8 12V

BACK SIDE OF MAIN PWB

Q801 (On Back)

5V Switch

IC405 uP Reset (On Back)

Reset by Charge of C431

Q902 (On Back)

12V LVDS control to Q901

Q901 (On Back)

12V LVDS On control to P900 Pins 1~4

LVDS

Right

Backlight

Tuner Pin 16 SMTE Color bar In

See back side of page for Waveforms for P900 using SMTE Color bar as the Input.

Plug

Scope

test point

Backlight pulse over

1000V p/p (45KhZ)

P402

Ballast

Section

P401

Side Control Keys

P100

POWER SUPPY

F700

5A 250V

335V

F700 90V in Stand-By

Pin 24 Pin 23

F101

8A 250V

AC In

Tweeter Tweeter

Ft. PWB

Spk

Assy.

Ft. TOUCH

LED/Push Sw

Spk

5V Pin 3 Video Pin 16 Audio SIF Pin 14

TUNER

MAIN PWB

P801

IC402

Pin 1 ~ 16

TUNER

ATSC/QAM/

NTSC

IC503

116

IC900

IC600

IC701

IC800

IC820

LD803

3.3V BCM IC805

OK LED

IC500

IC806

P501

*Q902

*IC400

Reset

BCM

*IC805

*IC802

IC501

P800

*Q901

IC100

BCM

X200 (54Mhz)

*IC810

IC807

IC1201

IC304

IC1200

IC202

IC404

Q400

*IC405

P900

IC302

IC300

IC303

IC301

24Mhz

IC1000

P401

X400

IC407

*Grayed out components on the back

P200

Not Used

LVDS CABLE P900 FROM MAIN PWB TO CONTROL

PWB P101 USING SMTP COLOR BAR INPUT

LAST TWO WAVEFORMS ARE FROM THE TUNER

Measurements +/- 5%