70
LC-32LE631
LC-40LE631
LC-46LE631
7.2.2 Connector overview (series xxLE631E)
Table 7-2 Connector overview 46” sets
Circuit Descriptions (continued)
Consult the Parts Listing at the end of this document for the
order codes of the boards
Table 7-3 Connector overview 40" sets
7.3
DC/DC Converters
The on-board DC/DC converters deliver the following voltages
(depending on set execution):
•
+3V3-STANDBY, permanent voltage for the Stand-by
controller, LED/IR receiver and controls; connector 1M95
pin 1
•
+12V, input from the power supply for TV550 common
(active mode); connector 1M95 pins 6, 7 and 8
•
+24V, input from the power supply for DVB-S2 (in active
mode); connector 1M09 pins 1 and 2
•
+1V1, core voltage supply for PNX855xx; has to be started
up first and switched "off" last (diagram B03B)
•
+1V2, supply voltage for analogue blocks inside PNX855xx
•
+1V8, supply voltage for DDR2 (diagram B03B)
•
+2V5, supply voltage for analogue blocks inside PNX855xx
(see diagram B03E)
•
+3V3, general supply voltage (diagram B03E)
•
+5V, supply voltage for USB and CAM (diagram B03E)
•
+5V-TUN, supply voltage for tuner (diagram B03E)
•
+V-LNB, input voltage for LNB supply IC (item no. 7T50)
•
+5V-DVBS, input intermediate supply voltage for DVB-S2
(diagram B08A)
•
+3V3-DVBS, clean voltage for silicon tuner and DVB-S2
channel decoder
•
+2V5-DVBS, clean voltage for DVB-S2 channel decoder
•
+1V-DVBS, core voltage for DVB-S2 channel decoder.
A +12 V under-voltage detector
(see diagram B03C) enables
the 12V to 3.3V and 12V to 5V DC/DC converters via the
ENABLE-3V3-5V line, and the 12V to 1.8V DC/DC converter
via the ENABLE-1V8 line. DETECT2 is the signal going to the
Stand-by microcontroller and ENABLE-3V3n is the signal
coming from the Stand-by microcontroller.
Diagram B03D
contains the following linear stabilisers:
•
+2V5 stabiliser, built around item no. 7UCO
•
+5V-TUN stabiliser, built around items no. 7UA6 and 7UA7
•
+1V2 stabiliser, built around items no. 7UA3 and 7UA4.
Diagram B08A
contains the DVB-S2-related DC/DC
converters and -stabilisers:
•
a +24V under-voltage detection circuitry is built around
item no. 7T04
•
the switching frequency of the 24 to 14...20V switched
mode converter is 350 kHz (item no. 7T03 and +V-LNB
lines)
•
the output signal on the +V-LNB line goes to the LNBH23Q
(item no. 7T50)
•
the LNBH23Q (item no. 7T50) sends a feedback signal via
the V0-CNTRL line
Connector
no.
1308
1316
1M95
Descr.
Mains
to display
to SSB
Pin
CN1
CN2
CN4
1
N
Anode 1+
+3V3stdby
2
L
n.c.
Standby
3
-
Cathode 1-
GND1
4
-
n.c.
GND1
5
-
Anode 2+
+12V
6
-
n.c.
+12V
7
-
Cathode 2-
+Vsnd (+24V)
8
-
n.c.
GND_SND
9
-
Anode 3+
BL-ON-OFF
10
-
n.c.
BL-DIM1 (Vsync)
11
-
Cathode 3-
BL-I-CTRL
12
-
n.c.
POK
13
-
Anode 4+
+24V (AL2_DVBS)
14
-
n.c.
GND1
15
-
Cathode 4-
-
Connector
no.
1308
1316
1M95
Descr.
Mains
to display
to SSB
Pin
CN1
CN2
CN4
1
N
Anode 1+
+3V3stdby
2
L
n.c.
Standby
3
-
Cathode 1-
GND1
4
-
n.c.
GND1
5
-
Anode 2+
+12V
6
-
n.c.
+12V
7
-
Cathode 2-
+Vsnd (+24V)
8
-
n.c.
GND_SND
9
-
Anode 3+
BL-ON-OFF
10
-
n.c.
BL-DIM1 (Vsync)
11
-
Cathode 3-
BL-I-CTRL
12
-
n.c.
POK
13
-
Anode 4+
+24V (AL2_DVBS)
14
-
n.c.
GND1
15
-
Cathode 4-
-
7.2
Power Supply
7.2.1
Power Supply Unit
All power supplies are a black box for Service. When defective,
a new board must be ordered and the defective one must be
returned, unless the main fuse of the board is broken. Always
replace a defective fuse with one with the correct
specifications! This part is available in the regular market.
Table 7-1 Connector overview 32" sets
Connector
no.
1308
1316
1M95
Descr.
Mains
to display
to SSB
Pin
CN1
CN2
CN4
1
N
A2
+3V3SB
2
L
n.c.
Standby
3
-
pin 5
GND1
4
-
n.c.
GND1
5
-
pin 3
+12V3
6
-
n.c.
+12V3
7
-
OCD
+Vsnd
8
-
n.c.
GND1
9
-
A1
BL-ON-OFF
10
-
n.c.
BL-DIM1
11
-
pin 13
BL-I-CTRL
12
-
n.c.
POK
13
-
pin 11
+24V
14
-
n.c.
GND1
15
-
GND1
-
In this manual, no detailed information is available because of
design protection issues.
