(2) PWB-MAIN
Test Point
Location
Description
Note
1
S5V
Pin12 of J303
5Vdc(always on ).
Power supply voltage for MCU, etc.
2
S3.3V
Pin13 of J303
3.3Vdc(always on ).
Power supply voltage for MCU, etc.
3
D3.3V
Pin7 of J190
3.3Vdc.
Power supply for IC300, IC4A0, IC4A1
etc.
4
A5V
Pin1 of J190
5Vdc.
Power supply for IC204, IC201 etc.
5
A3.3V
Pin5 of J190
3.3Vdc.
Power supply for IC203, etc.
6
D2.5V
Pin8 of J190
2.5Vdc.
Power supply for IC500.
7
AD3.3V
Pin6 of J190
3.3Vdc.
Power supply for IC2A3, IC205, IC2J1,
etc.
8
D1.9V
L400
1.9Vdc.
Power supply for IC500.
9
Digital_G7
14 of IC4A1
3.3Vdc.
MSB of green digital video signal to
LCD panel.
10 QHS
-27 of IC4A1
R4H6
Horizontal sync signal to LCD panel
11 QVS
-28 of IC4A1
R4H5
Vertical sync signal to LCD panel
12 QCLK
-31 of IC4A1
R4H3
Clock signal to LCD panel
13 QDE
-30 of IC4A1
R4H4
Data_Enable signal to LCD panel
14 A9V
10 of J190
9Vdc.
Power supply for IC100.
15 30V
Pin7 of IC180
30Vdc.
Power supply for TU1A0.
16 A1.5V,
D1.5V
Pin3 of IC600
1.5Vdc.
Power supply for IC601.
17 TU_SDA
Pin31 of IC300
Serial port data I/O for TU1A0.
18 TU_SCL
Pin28 of IC300
Serial port data clock forTU1A0.
19 S3.3V(RMC) Pin1 of J301
3.3Vdc(always on ).
Power supply for IR receiver and front
switches, etc.
20 RMC
Pin2 of J301
Data signal from IR receiver.
This data is sent to MCU.
21 KEY1
Pin4 of J301
Data signal from front switch.
This data is sent to MCU.
22 KEY2
Pin5 of J301
Data signal from front switch.
This data is sent to MCU.
23 V_OUT
Pin2 of J110
Analog video signal from VIDEO 1&2
inputs. (Composite video)
24 SY_OUT
Pin4 of J110
Analog video signal from VIDEO 1&2
inputs. (S-video)
Page 35
MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050
