42Lg60 :: Interconnect; Not Used; Gnd Gnd Gnd Gnd; Gnd Gnd Out In - LG 32LG40 Training Manual

42LG60 :: Interconnect

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
P2 "SMPS" to P801 "Main PWB"
Odd Pins
Pin Label STBY
1 16V 0V
3 Gnd Gnd
5 12V 0V
7 Gnd Gnd
9 5V 5V
11 5V 5V
13 Gnd Gnd
15 Gnd Gnd
Left
17 ERR 3.19V
Backlight
19 PWR 0V
Plug 21 *ADIM 0.1V
23 SEL 0V
*
ADIM Pin 21 can vary according to OSD Backlight
setting. 0.9V 0% to 3.3V 100%
P2
st
1 " short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K resistor.
2 1
This turns on the power supply.
4 3
2 nd : To test the Backlights, jump Pin 20 (INV) to Pin 19 (PWR)
6 5 Observe the Backlights.
4
If normal, the backlights should turn on and off 4 times. Then they go off.
8 7
If only ½ the backlights light, (Right side or Left Side), confirm connectors are OK.
10 9
If yes, panel defective.
12 11
If no backlight activity, confirm the Fuse F700 has approx. 300V on both sides.
14 13
If on one side, check fuse for open.
2 10K
16 15
If no 300V, replace Power Supply.
18 17
If 300V present, observe the center leg on the left hand side of ballast transformer
20 19
T701. Look for 58Khz pulse at 8.7V p/p.
22 21
If yes, confirm connectors to backlight OK, if OK, then panel defective.
24 23 If no pulse, replace the Power Supply.
L
G
Scope
Backlight pulse over
test point
1000V p/p (54KhZ)
6
P402
F700
Ballast
0 5A 250V
Section
335V
P401
Side Control Keys
P100
PDP Training - Fall 2008
LD1 Blue LED TFT Drive PWB Check
SET 0FF BOOT OK SET ON
LED OFF LED ON LED OFF
Anode 0V Anode 11.6V Anode 11.6V
Cathode 0V Cathode 0V Cathode 9.5V
T-CON PWB that allows the backlight to make it appear lit.
Even Pins
Run Pin Label STBY Run
16V 2 16V 0V 16V
Gnd 4 Gnd Gnd Gnd

11.8V

6 12V 0V 11.8V
Gnd
8 Gnd Gnd Gnd
5.15V 10 5V 5.15V 5.15V
5.15V 12 5V 5.15V 5.15V
Gnd 14 Gnd Gnd Gnd
Gnd 16 Gnd Gnd Gnd
3.3V 18 ACD 4V 4.57V
2.86V 20 INV 0V 3.29V
22 PDIM 0V 3.38V
1.68V
24 SYNC 0V 0V
3.2V
Pin 24
Pin 23
P2
Tweeter
POWER SUPPY
Spk
F101
8A 250V
AC
AC In
TFT PANEL
US1
0V
1.8V
3.2V
CN5 CN4
5V Switching Regulator
U15 LD1
Function
UC1
In from IC806
U16 On/Off
Out (+5V-TU)
TFT-Drive (T-CON)
n/c
Gnd
CN1 CN2
F1
3A 125V
Function
In (+12V)
11.6V
Gnd
Out
LVDS
Function
Gnd
Out
In
P103 P104
X101
P101
20.25Mhz LVDS
IC103
IC101
IC102
P102
CONTROL
IC108 IC109 IC110
IC108 IC109 IC110
5 (0V) 5 (2.5V)
5 (1.2V)
4 (1.79V) 4 (0V)
4 (1.3V)
3 (0V) 3 (0V) 3 (0V)
2 (3.36V) 2 (3.3V)
2 (3.37V)
1 (3.29V) 1 (3.37V)
1 (3.29V)
Tweeter
Ft. PWB
Assy.
J1
Spk
LG
J2
J3
5V Pin 3
J1
Video Pin 16
Ft. TOUCH
Audio SIF Pin 14
LED/Push Sw
78
FRONT SIDE OF MAIN PWB
IC800 IC807
2.6V Switching Regulator A2.6V-BCM
Pin Volts Function Pin Volts Name Function Pin
1 8.95V In 6,7,8,10 5V Gnd
2 3.3V Out 1,2,3,4,5 2.6V Out
3 5.0V On/Off 17 Power Control In
4 0.0V Use L801 left side to test output
5 0.0V Use any top pin of IC807 to test input 3.3V Switching Regulator A3.3V-BCM
IC806 IC820 Function Pin
9V Regulator 1.2V Switching Regulator A1.2V-BCM In
Pin Volts Function Pin Volts Name Out
1 11.6V In 6,7,8,10 5V On/Off
2 0.0V Out 1,2,3,4,5 1.2V
3 9V On/Off 17 1.8V Switching Regulator +1.8V-NTP
Power Control
IC404 Use L014 left side to test output Function Pin
3.3V Regulator Use any top pin of IC820 to test input In
Pin Volts IC404 uP 3.3V Out
1 0V 3.3VST-MICOM Gnd
2 3.3V Function Pin Volts Name
3 5V In 3 5V ST_+5V 5V Switch control to Q801
Function Pin
Out 2 3.3V Reset
Gnd 1 0V Gnd In
Control
Gnd
Tuner Pin 16 SMTE Color bar In
MAIN PWB
IC600
IC820
*Q902
P801
LD803
*IC400
IC503 3.3V BCM
Reset
IC805
BCM
OK LED
IC701
IC500
IC402 *IC805
Pin 1 ~ 16
*IC802
TUNER
1 16
IC900
IC806
TUNER
IC800
ATSC/QAM/
IC501
NTSC P501
BACK SIDE OF MAIN PWB
IC802 (On Back) Q801 (On Back)
3.3V Regulator 5V Switch
Volts Function Pin Volts
1 0V Source C ST-5V
2 3.3V Control B RL-ON (PWR)
3 5V Gnd E 0V
IC805 (On Back) IC405 uP Reset (On Back)
Reset by Charge of C431
Volts Function Pin Volts
2 5V In 1 3.3VST-MICOM
4 3.3V (A3.3V-BCM) Gnd 2 0.0V
1 Power Control-3.3V Out 3 Low to High to B Q400
IC810 (On Back) Q902 (On Back)
12V LVDS control to Q901
Volts Function Pin Volts
3 3.3V from IC802 Source C 12V
2 1.8V (+1.8V-NTP) Control B LVDS-Panel-Control
1 0V Gnd E 0V
Q802 (On Back) Q901 (On Back)
12V LVDS On control to P900 Pins 1~4
Volts Function Pin Volts
C ST-5V Source 1, 3 12V
B RL-ON (PWR) Control 2, 4 Low from Q902
E 0V Output 5~8 12V
Right
Backlight
Plug
See back side of page for Waveforms for
P900 using SMTE Color bar as the Input.
IC807
IC1201
P800 P900
*Q901
IC302 IC304
IC300
IC100 IC1200
BCM
IC202
IC303
IC301
IC404
X200 (54Mhz)
24Mhz
X400
Q400
*IC810 IC1000
E B
P200
uP
P401

Not Used

IC407
*IC405
*Grayed out components on the back
78
Schematics