42LH50 INTERCONNECT DIAGRAM
SMPS TEST 1: To Force
Power Supply On.
Disconnect P700 on Main
PWB.
Jump pin 7,8,9 or 10 (5V) to
pin 2 using a 100Ω resistor.
(Test Voltage Outputs 12V,
and 24V).
SMPS TEST 2: Jump pin 2
to pin 20 (INV-ON).
(Backlights and all voltages
should turn on).
P3400 CONNECTOR "MAIN PWB" to
J1 "Front IR / LED PWB
P201 “SMPS" to P2400 "Main PWB"
P201
SK101
AC IN
SK100
P401
P402
F100
3.15A/250V
Run 390V
STBY 165V
From Hot Gnd
F
5
01
SMPS
Switch Mode
Power Supply
F100
6.3A/250V
AC IN
T704
T703
1.2KV
Main Power SW
Side (Key) Controls
P1
Front PWB
Assembly
IR Receiver
Intelligent Sensor
P3000
P2
1.2KV
Open3.29V0V12
0.76V3.29V3.3V_ST11
GndGndGndGnd10
Open4.8V4.8VIR9
GndGndGndGnd8
GndGndGndGnd7
1.5V5.1V5.1V5V ST6
1.1V3.3V3.3VKey25
1.4V3.3V3.3VKey14
GndGndGndGnd3
1.67V3.3V3.3VSDA2
Open3.3V3.3VSCL1
Diode CheckRun STBYLabelPin
POWER On/Off
3.29V
STBYLabel
nc
ncncnc1
Gnd
nc
Diode
Check
GndGndGnd3,4,5,6
2.85V
5.14V5.14V5V
Gnd
GndGndGnd
1.2V
12.3V0V12V
0.81V
21.4V0V24V
nc
ncncnc19
Open
1.66V0V
1
A.DIM
21
ncncnc23
Run STBYLabelPin
1.19V
4.98V0VPWR-On2
2.25V
3.8V0VINV.ON20
Open
0V0VErr Out22
Open
3.2V0V
2
PDIM24
7,8,9,10
11,12
13,14
Gnd
GndGndGnd
15,16
17,18
R406
R403
R406 / R403
Bottom leg
48Khz
53V p/p
250V 82mF
250V 82mF
250V 82mF
250V 82mF
MAIN (Digital) Board
P1100
2
123
42LH50 MAIN PWB COMPONENT LAYOUT
Components that are
Grayed out are on the back.
2
1
2
3
1
2
3
4
5
2
123
P1102
X1100
IC2408
IC2405
IC3400
P201
X200
IC2502
D500
IC2300
IC2103
IC2404
IC501
Q2405
IC2407
IC3201
Q2401
IC3200
SW101
BCM Reset
IC102
X3200
Q2406
IC2400
L2417
L2419
IC2401
Q2408
Q2404
Q2402
IC2402
IC2403
IC2406
L2418
L2416
Q2407
P2400
P3400
P2300
IC502
IC2101
IC2500
IC2301
IC1101
TruMotion
IC3211
Q3204
24Mhz
12Mhz
54Mhz
LED LD2400
ZD3400
ZD3401
ZD3402
P1101
IC1101
Operates at high
temperature
1
TUNER
TU2500
TDVW-H103F
C
BE
C
B
E
IC2102
IC2100
Q2501
Q2500
Q3400
Q2400
Q100
IC1100
D2128
P2 "Front IR / LED PWB to P3000 Keys
Gnd
Key2
Gnd
Key1
Label
Gnd
Open
Gnd
Open
Diode
Check
GndGnd4
3.3V3.3V3
GndGnd2
3.3V
3.3V
1
Run STBYPin
IC103
Q3401
C
B
E
C
nc
A
2
1
2
3
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
For
Software
Upgrades
SIF 16
Video 19
(5V) 4
DIF + 12
DIF - 13
A
C
A
B
C
E
C
B
E
C
B
E
C
B
E
1
3
2
IC100
Video Processor
BCM
IC100 Operates at
high temperature
IC3202
Tuner
2
PDIM Pin 24 can vary according to type of signal
being processed and the OSD Backlight setting.
0.6V 0% to 3.3V 100%. Output from the BCM chip.
1
ADIM Pin 21 Fixed and not used
Hot Gnd
3
132
2
12
3
1.6V 1.6V
L208
1.49V
1.5V
X200 TP
A
K
A
1.4V
1.49V
Microprocessor
TO TFT MODULE
125V / 3A
CN5
CN4
TO TFT MODULE
UC1
FL3
F1 (12V)
TO TFT MODULE
T-CON PWB
(TFT Driver)
Gnd Protect
CN1
U11
D11
Q2
U12
U10
Pin 2
Pin 4
Pin 56,57,58
Pin 53,54
1) 0V
2) 1.19V
3) 3.3V
G) 0.1V
S) Gnd
D) 1.46V
0V
1V
B 2.78V
1
2
3
2
1) Gnd
2) Gnd
3) Gnd
4) Gnd
8) 3.34V
7) 3.09V
6) 3.34V
5) 3.34V
MCM Flash
LD1
A
3.3V On
C
0.7V On
1.38V Off
26V
16V
-4.9V
3.3V
Pin 59
Pin 57
Pin 3,4,5
Pin 7,8
26V
16V
-4.9V
3.3V
UC1 drives Q2 which
drives LD1 to assist the
backlights during start up.
Stby = Off
Both Anode / Cathode 0V
On
Anode 3.3V Cathode 0.7V
30 Seconds later
Off
Anode 3.3V Cathode 1.38V
U13
Speakers
P2400 "Main PWB" to P201 “SMPS"
nc
Gnd
nc
Diode Check
Gnd
nc
Open
Open
Open
Gnd
1
19
21
23
2
20
22
24
3,4,5,6
7,8,9,10
11,12
13,14
15,16
17,18
Open
Open
Open
Open
Open
For Voltages see P201
D8
L1
CN2
FL2
Gnd Protect
D7
L2
D9
D10
U5
E 3.3V
C 3.3V
16V
20.5V
14.25V
-2.4V
R701R702
R704
R705
R706
3
.
3
V
3.3V
16V
26V
27V
C744
R721
16V
( 12V )
U5
Gnd
-4.9V
U5 B+ ( 12V )
V
C
C
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