Circuit Descriptions
7.
7.2
Power Supply
Refer to figure
for the power architecture of this
platform.
Figure 7-2 Power Architecture 3000 series
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.
Consult the Philips Service web portal for the order codes of the
boards.
Important delta’s with the 3000 series platform are:
•
New power architecture for CCFL backlight (IPB)
•
“Boost”-signal is now a PWM- continuous variable.
The control signals are:
•
Stand-by
•
Inverter “on/off”
•
DIM (PWM) (not for PSDL)
In this manual, no detailed information is available because of
design protection issues.
The output voltages to the chassis are:
•
5V3 (Stand-by mode only)
•
3V3 (Stand-by mode only)
•
12V (on-mode)
•
+24V (audio power) (on-mode)
•
+24V (bolt-on power) (on-mode)
•
Output to the display; in case of
- IPB: High voltage to the LCD panel
- PSL and PSLS (LED-driver outputs)
- PSDL (high frequent) AC-current.
7.2.2
Diversity
The diversity in power supply units is mainly determined by the
diversity in displays.
The following displays can be distinguished:
•
CCFL backlight: power board is conventional IPB
•
LED backlight:
- side-view LED without scanning: PSL power board
- side-view LED with scanning: PSLS power board
- direct-view LED without 2D-dimming: PSL power board
- direct-view LED with 2D-dimming: PSDL power board.
PSL stands for Power Supply with integrated LED-drivers.
PSLS stands for a Power Supply with integrated LED-drivers
with added Scanning functionality (added microcontroller).
PSDL stands for a Power Supply for Direct-view LED backlight
with 2D-dimming.
7.2.3
Connector overview
7.3
DC/DC Converters
The on-board DC/DC converters at the SSB deliver the
following voltages (depending on set execution):
•
3V3SB, permanent voltage for the Stand-by controller,
LED/IR receiver and controls;
•
+12V, input from the power supply for the panel common
(active mode); MEMC/TUNER Power
•
+24V, input from the power supply for the amplifier
•
VCCK, Soc Core Power: 1.15V supply for MTK5301B, has
to be started up first and switched “off” last
LED Driver
Platform
MT5301B
PSU
System Power
1 power - PCB
Amplifier
ON/OFF
DIMING
12V
24V
5V
5V
GND
24V
LVDS
12V
CN701
19330_201_120611.eps
120612
Connector
32PFL3007
42PFL3007
no.
CN902
CN904
CN902
Descr.
to SSB
to panel
to SSB
Pin
CN902
CN904
13
1
ON/OFF
+24V
ON/OFF
2
DIM
+24V
PDIM
3
+12V
+24V
+12V
4
+12V
+24V
+12V
5
GND
+24V
GND
6
GND
GND
GND
7
GND
GND
GND
8
+24V
GND
+24V
9
+24V
GND
+24V
10
PS_ON
GND
PS_ON
11
+5V
NC
+5V
12
+5V
ON/OFF
+5V
13
-
DIM
ACD
