LG 42LH20 Service Manual page 72

42LH20 Main Board (Front View) Component Layout
42LH20 Main Board (Front View) Component Layout
Q706
Q706 Switch
1 (5V)
2 (0.48V)
(12V LVDS)
3 (0.48V)
(5V General)
4 (6V)
5-6 (12.3V)
7-8 (5V)
P700
0V 0.6V)
1 (3.28V)
2 (Reset) .3V
3 (Gnd)
Q702
Inv-On Control
3.85V (0V)
0V
Gnd
(0.6V)
( ) = Off
IC600
Audio
56 Pin
Speakers
P600
IC704 IC705
IC704
3.3V_FE 1.26V_VDDC
3.3V-FE
1 (0.78V)
2 (Gnd)
3 (5V)
L710
4 (7.4V)
5 (2.12V)
IC107
6 (3.28V)
IC701
7 (3.28)
8 (5V)
IC701 IC705
1.8V_DDR 1.26V_VDDC
IC107
Power Det 1 (N/C) 1 (0.78V)
2 (3.18V) 2 (Gnd)
3 (3.18V) 3 (5V)
4-5 (N/C) 4 (5.9V)
6 (1.87V) 5 (5V)
7 (0.8V) 6 (1.3V)
8 (Gnd) 7 (1.3V)
8 (3.16V)
Reset
X100
IC100
12 Mhz
To
To Front
Control
P1204
IC105
HDCP EEPROM
L726
1-2 (Gnd)
3 (5V)
5-6 (0V)
4-7 (Gnd)
IC105 6 (1.2V)
7 (0.8V)
8 (5V)
IC101
IC100
Flash Memory
IC100
1-2 (0V)
Micro and Video
3-4 (0V)
Processor
5-6 (0V)
Mstar Chip
7-8 (3.2V)
MAIN (Digital) Board
Grayed Out ICs are located on Back
P801
IC1003
To T-CON
(LVDS)
X1005
25 Mhz
IC101
TUNER
19 Video
16 SIF
15 (5V)
13 DIF -
12 DIF +
4 (5V)
1
C
KEY
B E
IC1000
IC1000
1.2V_PVSB
LD1000
1 (N/C)
2 (3.2)
IC1004
3 (3.2V)
8vsb/
4-5 (N/C)
QAM
6 (1.2V)
7 (0.8V)
8 (Gnd)