LG 32LG40 Training Manual page 70

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