Specifications
Circuit Descriptions
EN 42 Q552.2L LA7.
2011-Apr-22
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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 Philips Service web portal 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 Blockbuster (series xxPFL6600/xx)
Table 7-1 Connector overview 32" sets
Table 7-2 Connector overview 37" sets
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 stabilizers:
• +2V5 stabilizer, built around item no. 7UCO
• +5V-TUN stabilizer, built around items no. 7UA6 and 7UA7
• +1V2 stabilizer, built around items no. 7UA3 and 7UA4.
Diagram B08A contains the DVB-S2-related DC/DC
converters and -stabilizers:
• 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 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 -
Connector
no. 1308 1316 1M95
Descr. Mains to display to SSB
Pin CN1 CN2 CN4
1 N Anode_R +3V3stdby
2 L n.c. Standby
3 - R5 Cathode GND1
4 - R4 Cathode GND1
5 - R3 Cathode +12V
6 - R2 Cathode +12V
7 - R1 Cathode +Vsnd (+24V)
8 - L1 Cathode GND_SND
9 - L2 Cathode BL-ON-OFF
10 - L3 Cathode BL-DIM1 (Vsync)
11 - L4 Cathode BL-I-CTRL
12 - L5 Cathode POK
13 - n.c. +24V (AL2_DVBS)
14 - Anode_L GND1
15 - - -
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- -