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Do not run without
heat sink attached
Ballast PWB
On then Off
after ballast
fires
LD1
Ballast
Drive LED
Pin 1 Pin 6
22V p/p 34V p/p
1616
T1 T2
Secondary over 1.2Kv
To Backlight
Left Side
MCN1
24V
F1
8A / 150V
To Backlight
Right Side
P203 "SMPS" to MCN1 "Ballast PWB"
Pin Label STBY Run Diode Check
1 24V 0V 24.52V 0.33V
2 24V 0V 24.52V 0.33V
3 24V 0V 24.52V 0.33V
4 24V 0V 24.52V 0.33V
5 24V 0V 24.52V 0.33V
6 Gnd Gnd Gnd Gnd
7 Gnd Gnd Gnd Gnd
8 Gnd Gnd Gnd Gnd
9 Gnd Gnd Gnd Gnd
10 Gnd Gnd Gnd Gnd
11 BR1 1.67V OL
12 INV On-Off 3.45V OL
13 PWM-DIM 3.40V OL
14 ERROR 0V OL
0V
0V
0V
0V
*PWM-DIM (PDIM) Pin 13 can vary according to
OSD Backlight setting. 0.9V 0% to 3.3V 100%
Not Used
CN403
CN402
CN401
DVD Drive
CN400
32LG40 INTERCONNECT DIAGRAM
P201 Odd "SMPS" to P800 "Main PWB"
TO TFT MODULE
CN2 CN3
T-CON Board
12V
F1
6.3V/1.5A
Far left and right pins are not
counted, they are ground.
P203
P202
Not Used
5A / 250V
A/C Fuse
F100
L
A/C In
SC100
N
US2
3) 0.0V
2) 1.8V
1) 3.3V
CN1
Power Supply
3.15A / 250V Rating
334V Actual Reading
F101
Pin Label STBY Run Diode Check Pin Label STBY Run Diode Check
*PWM-DIM (PDIM) Pin 22 can vary according to
OSD Backlight setting. 0.9V 0% to 3.3V 100%
P201 Even "SMPS" to P800 "Main PWB"
1 16.5V 0V 16V 0.31V 2 16.5V 0V 16V 0.31V
3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd
5 12V 0V 11.8V 1.69V 6 12V 0V 11.8V 1.69V
7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd 0V
9 5.2V 5.15V 0.34V 10 5.2V 5.15V 5.15V 0.34V
11 5.2V 5.15V 0.34V 12 5.2V 5.15V 5.15V 0.34V
5.15V
5.15V
13 Gnd Gnd Gnd Gnd 14 Gnd Gnd Gnd Gnd
15 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd
17 ERR 0V 0V 1.26V 18 ACD 5.05V 4.57V OL
19 PWR 0V 2.86V OL 20 INV-On/Off 0V 3.29V OL
21 BR1 0.1V 1.68V OL 22 PWM-DIM 0V 3.38V OL
23 N/C 0V 3.2V OL 24 N/C 0V 0V OL
P902 Pin 11
To Force Power Supply On.
Disconnect P800 on Main PWB.
Jump 5V to pin 19.
Ballast and All voltages should turn on.
P201
Example Of LVDS Signal
Waveforms for P902
Pins 11 through 20
(All waveforms on back of
Q901
Q900
IC809
P902
P200
Main (Digital) Board
Reset
BSM
IC400
X400
IC805
IC401
24 Mhz
1.5V
IC802
IC801
IC00
BCM
X200
54 Meg
Grayed Out ICs are
located on Back
1.5V
1.5V
TUNER
P800
P901
P900
P904
P401
IC407
IC405
IC801
P500
IC808
Micro
Q400
LD800
IC806
To Speakers
11X17 fold out)
Software
Upgrades
IC807
IC803
Side (Key) Controls
P101
Front PWB
Assembly
(Interface)
J2 J1
IR Receiver
Power Button
IC201 IC405
PIN FUNCTION NAME STBY RUN PIN
2 IN +5V 0V 5V 1 IN 3.3V_MICON 3.41V 3.41V 1 On/Off Control Power_CTL_3.3V 0V 3.4V 1,3 IN ST_5V 0V 5V
3 On/Off Control BCM DDR Power 0V 3.4V 2 Gnd Gnd Gnd Gnd 2 IN +5V_SUB 0.36V 5V 2,4 On/Off Control Q802 0V 0.28V
7 OUT USB_PWR_Out_1 0V 5V 3 OUT Reset (Lo-Hi) 0.6V 0.6V 3 Gnd Gnd Gnd Gnd 5,6,7,8 OUT +5V_SUB 0V 5V
8 OUT +3.3V 0V 3.1V
IC304 PIN
PIN FUNCTION NAME STBY RUN 1Gnd +3.3V0V5VPIN FUNCTION NAME STBY RUN B On/Off Control RL_ON 0V 3.29V
3,8 OUT DDRO_VTT 0V 1.29V 2 OUT Gnd Gnd Gnd 1 IN +9V 0V 8.9V C Pull Down ST_5V 0V 5V
5,6,7 IN D2.6V_BCM 0V 2.6V 3 IN +5V_SUB 0V 3.2V 2 On/Off Control Power_CTL_3.3V 0V 3.4V E Gnd Gnd Gnd Gnd
4 On/Off Control DDRO_VTT 0V 1.29V
IC400 PIN FUNCTION NAME STBY RUN 4 n/c n/c n/c n/c PIN FUNCTION NAME STBY RUN
Reset Generator for IC401 3.3V BCM (On Back)
PIN FUNCTION NAME STBY RUN 1 IN +12V 0V 12V 5 Gnd Gnd Gnd Gnd B Reset Reset 0.6V 0.6V
1 IN D3.3V_BCM 0V 3.4V 2 Gnd Gnd Gnd Gnd
2 Gnd Gnd Gnd Gnd 3 OUT +9V 0V 9V PIN FUNCTION NAME STBY RUN E Gnd Gnd Gnd Gnd
3 OUT Reset (Lo-Hi) 0V 3.39V 6,7,8,10 IN +5V_SUB 0.36V 4.98V
USB Power
2.6V BCM
Reset Generator for Q400 Micro Reset
FUNCTION
+3.3V Regulator (3.3V TMDS_SW)
IC802
FUNCTION
IC803
+9V Regulator
D3.3V/A3.3V_BCM Regulator turns on LD800
NAME STBY RUN PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN
NAME STBY RUN
IC806 Q801
4 OUT D3.3V_BCM 0.1V 3.4V
IC807
IC809
17 On/Off Control Power_CTL_2.6V 0V 3.41V
1,2,3,4,5 OUT D2.6V_BCM 0V 2.66V
14,15 n/c n/c n/c n/c
11,18,19,20 Gnd Gnd Gnd Gnd
D3.3V_BCM Regulator (Also A3.3V_BCM)
3OUT +5V0V5V
D2.6V_BCM Regulator (Also A2.6V_BCM)
5V Sub Switch Controller for Q801
Q802
PIN FUNCTION NAME STBY RUN
Q400
C Vcc 3.3VVST_MICON 0V 0V
5V Sub Switch
Reset Generator for MICRO IC407
IC401 IC808
PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN
14 IN D3.3V_BCM 0V 3.41V 2 IN ST_5V 5V
1 On/Off Control Reset from IC400 0V 3.4V 3 OUT 3.3VST_MICON 3.43V
6 OUT BCM_RESET 0V 3.4V 4 Gnd Gnd Gnd Gnd
IC801 Q900
PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN
1 Gnd Gnd Gnd Gnd B Control
2 OUT +1.8V_NTP 0V 1.8V C Pull Down 12V LVDS Switch Control 0V 0V
3IN
IC805 Q901
PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN
6,7,8,10 IN +5V_SUB 0.38V 5V 1,3 IN 12V 0V 12.36V
17 On/Off Control Power_CTL_1.2V 0V 3.41V 2,4 On/Off Control Q900 0V 6.16V
1,2,3,4,5 OUT D1.2V_BCM 0V 1.29V 5,6,7,8 OUT LVDS 12V 0V 12.36V
13, 14,15,16 n/c n/c 0V 0V
11,12,18,
19,20
Screen Print for Pin No is incorrect, use IC
BCM IC100 Reset
+1.8V_NTP Regulator
3.3V_TMDS_SW
D1.2V/A1.2V BCM Regulator
Gnd Gnd Gnd Gnd
0.26V 3.29V E Gnd Gnd 0V 0V
ST-BY 3.3V DC-DC Converter
Controller for LVDS 12V Switch Q901
LVDS_PANEL_CTRL
LVDS 12V Switch
REGULATORS/ICs ON BACKREGULATORS/ICs ON FRONT
5V
3.43V
0V 0.75V
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32LG40 LVDS P902 WAVEFORMS
32LG40 LVDS CABLE WAVEFORMS:
Waveforms taken using SMTP Color Bar input.
All readings give the Scale and Time Base related to scope settings.
Top waveform in each image gives a slower rate.
10mV at 5uS per division.
Bottom waveform shows a blow up sample. 10mV at 2uS per division.
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