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LC-32LE63x
LC-40LE63x
LC-46LE63x
Circuit Descriptions (continued)
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.
Consult the Parts Listing at the end of this document for the
order codes of the boards
In this manual, no detailed information is available because of
design protection issues.
7.2.2
Connector overview (series xxLE63xE/RU)
Table 7-1 Connector overview 32" sets
no.
1308
Descr.
Mains
Pin
CN1
1
N
2
L
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
Table 7-2 Connector overview 46" sets
no.
1308
Descr.
Mains
Pin
CN1
1
N
2
L
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
Connector
1316
1M95
to display
to SSB
CN2
CN4
A2
+3V3SB
n.c.
Standby
pin 5
GND1
n.c.
GND1
pin 3
+12V3
n.c.
+12V3
OCD
+Vsnd
n.c.
GND1
A1
BL-ON-OFF
n.c.
BL-DIM1
pin 13
BL-I-CTRL
n.c.
POK
pin 11
+24V
n.c.
GND1
GND1
-
Connector
1316
1M95
to display
to SSB
CN2
CN4
Anode 1+
+3V3stdby
n.c.
Standby
Cathode 1-
GND1
n.c.
GND1
Anode 2+
+12V
n.c.
+12V
Cathode 2-
+Vsnd (+24V)
n.c.
GND_SND
Anode 3+
BL-ON-OFF
n.c.
BL-DIM1 (Vsync)
Cathode 3-
BL-I-CTRL
n.c.
POK
Anode 4+
+24V (AL2_DVBS)
n.c.
GND1
Cathode 4-
-
Table 7-3 Connector overview 40" sets
no.
1308
1316
Descr.
Mains
to display
Pin
CN1
CN2
1
N
Anode 1+
2
L
n.c.
3
-
Cathode 1-
4
-
n.c.
5
-
Anode 2+
6
-
n.c.
7
-
Cathode 2-
8
-
n.c.
9
-
Anode 3+
10
-
n.c.
11
-
Cathode 3-
12
-
n.c.
13
-
Anode 4+
14
-
n.c.
15
-
Cathode 4-
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
72
Connector
1M95
to SSB
CN4
+3V3stdby
Standby
GND1
GND1
+12V
+12V
+Vsnd (+24V)
GND_SND
BL-ON-OFF
BL-DIM1 (Vsync)
BL-I-CTRL
POK
+24V (AL2_DVBS)
GND1
-
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