Circuit Descriptions
7.
7.4
Circuit Description
7.4.1
System power
The main board power is received at connector CN7001 from
power board, to receive the power and signals from the PSU.
See
for the correct pining, The shown test points in
Table 7-1 Connector CN7001 overview
Figure 7-11 System power
7.4.2
Digital/Analog power
The DVDD3V3 and AVDD3V3 are from U7005 (G1084), it can
provide 5 A output current. R7013/FB7006 are for power
measurement. FB7006 also is for filtering.
Figure 7-12 Digital/Analog power
7.4.3
Tuner power
The tuner power is derived from +12V by U7001 (AS7805), the
power should not drop below 4.75 V for the LG tuner, but it can
be 4.9V at least.
Figure 7-13 Tuner power
7.4.4
Peripheral
This chassis uses 128 MB NAND flash for it’s software code. It
stores the main software of the TV.
Figure 7-14 Peripheral
7.4.5
System EEPROM
The EEPROM is 128 Mb, it includes many important data for
this TV for example NVM and, adjustment data.
Figure 7-15 System EEPROM
Item
Pin
Description
1
1
INVERTER_ON_OFF, Inverter board
control (Low: ON, High: OFF)
2
2
BRIGHT_ADJ, Inverter bright PWM
control (Max: 0V, Min: 3V3)
3
3, 4
+12V Supply
4
5, 6, 7
Ground
5
8, 9
+24V Supply
6
10
STANDBY, Standby
control (High: Normal, Low: Stand by)
7
11, 12
STB_PWR5V, +5VSB Supply
8
13
LED ON, LED on power board need a signal to
control it by panel turn on needed
DC POWER INPUT
BRIGHT_ADJ
STB_PWR5V
INVERTER_ON_OFF
STANDBY
+12V
+24V
C7007
NC/22uF 10V
C7007
NC/22uF 10V
R7009
100OHM1/16W
R7009
100OHM1/16W
T
P
7004
T
P
7004
R7010
-5% 1/8W
R7010
-5% 1/8W
T
P
7006
T
P
7006
T
P
7007
T
P
7007
T
P
7001
T
P
7001
T
P
7002
T
P
7002
T
P
7005
T
P
7005
R7006
0R05 4A 1/4W
R7006
0R05 4A 1/4W
CN7001
CONN
CN7001
CONN
1
2
3
4
5
6
7
8
9
10
11
12
13
T
P
7011
T
P
7011
T
P700
3
T
P700
3
R7005
0R05 4A 1/4W
R7005
0R05 4A 1/4W
19080_215_110325.eps
110325
DIGITAL/ANALOG POWER DVDD3V3/AVDD3V3 form +5V_SW
RA
RB
Vout
DVDD3V3
+5V_SW
AVDD3V3
R7020
130R 1%
R7020
130R 1%
+
C7027
100uF 16V
+
C7027
100uF 16V
+
C7022
100uF 16V
+
C7022
100uF 16V
FB7005
220R/2000mA
FB7005
220R/2000mA
1
2
C7028
100N 16V
C7028
100N 16V
FB7006
220R/2000mA
FB7006
220R/2000mA
1
2
C7023
10uF 10V
C7023
10uF 10V
C7029
100N 16V
C7029
100N 16V
R7013
0R05 4A 1/4W
R7013
0R05 4A 1/4W
R7021
220R 1%
R7021
220R 1%
U7005 G1084TU3UF
U7005 G1084TU3UF
VIN
3
VOUT
2
ADJ
/GN
D
1
19080_216_110325.eps
110401
TUNER POWER +5V_TUNER form +12V
+5V_TUNER
+12V
R7026
0R05 4A 1/4W
R7026
0R05 4A 1/4W
+
C7030
100uF 16V
+
C7030
100uF 16V
C7018
330NF 16V
C7018
330NF 16V
C7021
22uF 10V
C7021
22uF 10V
R7233
NC/18 OHM 2W
R7233
NC/18 OHM 2W
U7001 AS7805DTR-E1
U7001 AS7805DTR-E1
GND
2
OUT
3
IN
1
C7020
100N 16V
C7020
100N 16V
FB7001
220R/2000mA
FB7001
220R/2000mA
1
2
C7019
10uF 16V
C7019
10uF 16V
19080_217_110325.eps
110401
NAND Flash
NAND 128MB
PDD7
PDD6
PARB#
PACLE
PDD5
PAALE
PDD4
PDD3
PDD2
POOE#
PDD1
POCE1#
PDD0
VDD_NAND
VDD_NAND
POWE#
Flash_WP#
DVDD3V3
DVDD3V3
U4005
NAND01GW3B2CN6E
U4005
NAND01GW3B2CN6E
NC
1
NC
2
NC
3
NC
4
NC
5
NC
6
RB
7
R
8
E
9
NC
10
NC
11
VDD
12
VSS
13
NC
14
NC
15
CL
16
AL
17
W
18
WP
19
NC
20
NC
21
NC
22
NC
23
NC
24
NC
25
NC
26
NC
27
NC
28
I/O0
29
I/O1
30
I/O2
31
I/O3
32
NC
33
NC
34
NC
35
VSS
36
VDD
37
NC
38
NC
39
NC
40
I/O4
41
I/O5
42
I/O6
43
I/O7
44
NC
45
NC
46
NC
47
NC
48
C4040
100N 16V
C4040
100N 16V
R4027
4.7K1/16W
R4027
4.7K1/16W
C4042
1UF16V
C4042
1UF16V
R4025
330 OHM 1/16W
R4025
330 OHM 1/16W
C4041
100N 16V
C4041
100N 16V
19080_218_110325.eps
110401
SYSTEM EEPROM
LO = > Enable Write
HI = > Disable write
ǂǂ
Pin7 WP
OSCL0
OSDA0
SYS_EEPROM_WP
DVDD3V3
Q4003
BC847C
Q4003
BC847C
3
2
1
R4102
10K 1/16W 5%
R4102
10K 1/16W 5%
R4013
4K7 1/16W 1%
R4013
4K7 1/16W 1%
R4045
NC/0R05 1/10W
R4045
NC/0R05 1/10W
R4044
4K7 1/
10W 5
%
R4044
4K7 1/
10W 5
%
U4008
AT24C128BN-SH-T
U4008
AT24C128BN-SH-T
A0
1
A1
2
A2
3
VSS
4
SDA
5
SCL
6
WP
7
VCC
8
R404
3
4K7 1/
10W 5
%
R404
3
4K7 1/
10W 5
%
R4042
4K7 1/10W 5%
R4042
4K7 1/10W 5%
19080_219_110325.eps
110401