Specifications

P900
P800
P401
P501
P801
TUNER
ATSC/QAM/
NTSC
IC100
BCM
IC302
IC300
IC303
IC301
IC404
IC1000
X200 (54Mhz)
IC800
IC806
IC402
IC503
IC701
IC600
IC820
42LG60 CIRCUIT INTERCONNECT DIAGRAM
CN5 CN4
TFT-Drive (T-CON)
CN1 CN2
P103 P104
TRU-MOTION
P102
P101
LVDS
POWER SUPPY
J1
J2
J1
J3
P2
LVDS
Ft. TOUCH
LED/Push Sw
Spk
Spk
Ft. PWB
Assy.
AC In
Left
Backlight
Plug
Right
Backlight
Plug
TFT PANEL
IC101
IC103
IC102
IC108
IC109 IC110
5 (2.5V)
4 (0V)
3 (0V)
2 (3.3V)
1 (3.37V)
5 (0V)
4 (1.79V)
3 (0V)
2 (3.36V)
1 (3.29V)
5 (1.2V)
4 (1.3V)
3 (0V)
2 (3.37V)
1 (3.29V)
X101
20.25Mhz
UC1
LD1
U15
U16
US1
0V
3.2V
1.8V
3A 125V
11.6V
SET 0FF
LED OFF
SET ON
LED OFF
LD1 Blue LED TFT Drive PWB Check
Anode
Cathode
0V
0V
BOOT OK
LED ON
Anode
Cathode
11.6V
0V
Anode
Cathode
11.6V
9.5V
F101
8A 250V
AC
F700
5A 250V
335V
Backlight pulse over
1000V p/p (45KhZ)
IC500
X400
IC407
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.
Side Control Keys
MAIN PWB
P200
Not Used
F1
IC900
IC807
IC1201
IC304
IC1200
IC202
LD803
3.3V BCM
IC805
OK LED
IC501
Pin 1 ~ 16
Q400
EB
24Mhz
P2
3
1
7
5
11
9
15
13
19
17
23
21
4
2
8
6
12
10
16
14
20
18
24
22
10K
1
st
” short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K resistor.
This turns on the power supply.
2
nd
: 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.
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.
PDIM Pin 22 can vary according to OSD Backlight
setting. 0.9V 0% to 3.3V 100%
P2 "SMPS" to P801 "Main PWB"
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
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
Odd Pins
Pins 17, 23 and 24
Not Used
IC109
IC108
IC110
116
*Q901
*Q902
*IC400
*IC802
*IC810
*IC405
*Grayed out components on the back
Function Pin Volts Function Pin Volts Name Function Pin Volts Function Pin Volts
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
Power Control
In 3 5V Gnd E 0V
n/c 4 0.0V
Gnd 5 0.0V
Function Pin Volts Function Pin Volts
In 2 5V In 1 3.3VST-MICOM
Function Pin Volts Function Pin Volts Name Out 4 3.3V (A3.3V-BCM) Gnd 2 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
Power Control
Function Pin Volts Function Pin Volts
In 3 3.3V from IC802 Source C 12V
Function Pin Volts Out 2 1.8V (+1.8V-NTP) Control B LVDS-Panel-Control
1 0V Gnd 1 Gnd E 0V
Out 2 3.3V Function Pin Volts Name
In 3 5V In 3 5V ST_+5V
Out 2 3.3V Reset Function Pin Volts Function Pin Volts
Gnd 1 0V Gnd In C ST-5V Source 1, 3 12V
Control B RL-ON (PWR) Control 2, 4 Low from Q902
Gnd E 0V Output 5~8 12V
Q901 (On Back)
12V LVDS On control to P900 Pins 1~4
IC404 uP 3.3V
3.3VST-MICOM
IC404
IC806 IC820
1.2V Switching Regulator A1.2V-BCM
Use L014 left side to test output
Q802 (On Back)
5V Switch control to Q801
IC807
2.6V Switching Regulator A2.6V-BCM
Use L801 left side to test output
Use any top pin of IC807 to test input
Use any top pin of IC820 to test input
9V Regulator
3.3V Regulator
Q801 (On Back)
5V Switch
IC405 uP Reset (On Back)
Reset by Charge of C431
IC802 (On Back)
3.3V Regulator
Q902 (On Back)
FRONT SIDE OF MAIN PWB
IC810 (On Back)
1.8V Switching Regulator +1.8V-NTP
3.3V Switching Regulator A3.3V-BCM
IC805 (On Back)
IC800
BACK SIDE OF MAIN PWB
5V Switching Regulator
12V LVDS control to Q901
Gnd
Gnd
0V
P100
See back side of page for Waveforms for
P900 using SMTE Color bar as the Input.
Tuner Pin 16 SMTE Color bar In
uP
5V Pin 3
Video Pin 16
Audio SIF Pin 14
TUNER
Ballast
Section
*IC805
Reset
BCM
P402
P401
Scope
test point
Tweeter Tweeter
Pin 24
Pin 23
LG
Pin 21 is a
Fixed Voltage
F700 90V in Stand-By