Circuit Descriptions
7.
7.3
DC/DC Converters
The on-board DC/DC converters deliver the following voltages
(depending on set execution):
•
+5V-STANDBY, permanent voltage for the Stand-by
controller, LED/IR receiver and controls
•
+12V, input from the power supply for the panel common
(active mode)
•
+12V, input from the power supply for audio amplifier
•
+1V2, from the power supply for the scaler IC MT5580
•
+1V5, supply voltage for DDR2 (diagram B03B)
•
+3V3, general supply voltage
•
+5V, supply voltage for USB and CAM
•
+3V3-TUN, supply voltage for tuner
•
+5V-USB, input intermediate supply voltage for USB
•
+3V3 from the power supply for the scaler IC MT5580
•
+12V, input from the Power supply for the Ambilight
common.
•
+3V3-DVBS, clean voltage for DVB-S2 channel decoder.
•
+1V2-DVBS, core voltage for DVB-S2 channel decoder.
Figures gives a graphical representation of the DC/DC
converters with its current consumptions:
Figure 7-3 DC/DC converters
7.4
Front-End Analogue and DVB-T, DVB-C,
ISDB-T reception
7.4.1
Front-END Analogue part
The Front-End for Analogue tuner consist of the following key
components:
•
TUNER EUROPE ST25CS-2-E(DVB-T/C)
•
SCALER MT5580PUEI/B PBGA-511 TV Processor
Below find a block diagram of the front-end application for the
front-end application for analogue part.
3
VLED+
n.c.
n.c.
n.c.
PS_ON
VLED-
VLED_1
PS_ON
PS_ON
VLED_1
4
VLED+
n.c.
n.c.
n.c.
n.c.
VLED-
VLED_1
2D/3D
2D/3D
VLED_1
5
LED3
GND
GND
VLED-
GND
n.c.
n.c.
GND
GND
n.c.
6
LED4
GND
GND
VLED-
GND
n.c.
n.c.
GND
GND
n.c.
7
n.c.
GND
GND
-
GND
n.c.
n.c.
GND
GND
n.c.
8
n.c.
GND
GND
-
GND
n.c.
n.c.
GND
GND
n.c.
9
-
n.c.
+12V_audio
-
+12V_AUDIO
VLED-
VLED_2
+12V
+12V_Audio
VLED_2
10
-
n.c.
+12V_audio
-
+12V_AUDIO
VLED-
VLED_2
+12V
+12V_Audio
VLED_2
11
-
+12V
+12V
-
+12V
n.c.
n.c.
+12V
+12v
n.c.
12
-
+12V
+12V
-
+12V
VLED+
VLED+
+12V
+12v
VLED+
13
-
+12V
+12V
-
+12V
-
-
+12V
+12v
-
14
-
+12V
+12V
-
+12V
-
-
+12V
+12v
-
Connector
Model
24"
32"
42"
40" & 47" & 48"
55"
Number
CN8101
CN9904
CN9101
CN8501
CN9301
CN8101
CN8101
CN9301
CN9301
CN8101
Description to panel
to SSB
to panel
to SSB
to SSB
to panel
to panel
to SSB
to SSB
to panel
Pin
8
14
14
6
14
12
12
14
14
12
19600_202.eps
P12V
3.3V
AVDD3V3
3V3SB
VCCK
AVDD1V2
1.5V
DV1.2
5V_SW
5V_SW
5V_SW
5V_USB
5V_USB
PVDD
FB755
FB754
AMP STA381BWTR
U702
Q757
U704
U703
U702
Q702
U102
U703
U709
U705
Tuner
MT5580
USB
CI-VCC
U701
U105
DDR
Demond IC
WiFi VCC
EMMC
U4250
MT5580
12V_AL
5V-STB
LNB Power
Keyboard
MT5580
MT5580
+12V
5VSB
P12V
PANEL_VCC
Q750