Circuit Descriptions
7.
7.2
Power Supply
7.2.1
Power Supply Unit
Before checking other parts first check whether fuse on the
PSU is not 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.
The output voltages to the chassis are:
•
+5V / +3V3 / 12 V- STANDBY
•
+5 V / +12V (on-mode)
•
+24V for audio circuit, (on-mode)
7.2.2
USB Interface
The SOC has two input port for USB, therefore air mouse,
internal wi-fi interface and USB2 are combined with HUB. This
property is optional. If air mouse and wi-fi interfaces are not
aligned, two USB are connected directly to main IC.
Figure 7-2 USB Interface
7.3
Power Management
The on-board DC/DC converters receive the following voltages
from the PSU (depending on set execution):
•
+3.3 VSB, for standby mode.
•
+5 VSB, for standby mode.
•
+12 VSB, for standby mode.
•
+3.3 V, for on mode.
•
+5 V, for on mode.
•
+24 V, for on mode, audio power.
7.4
Circuit Description
7.4.1
System power
The main board power is received at connector CN3 or CN2
from power board, to receive the power and signals from the
PSU. See
or
for the correct pining.
Figure 7-3 Connector CN3 overview
Figure 7-4 Connector CN2 overview
19420_206_130315.eps
130315
19830_201_152001.eps
152001
PIN11
12V_STBY
DIMMING
BACKLIGHT_ON/OFF
STBY_ON/OFF
CN3
12
11
10
9
8
7
6
5
4
3
2
1
W/B2B
19830_205_152001.eps
152001
TP121
TP123
TP119
TP122
TP124
TP120
12V_STBY
STBY_ON/OFF
BACKLIGHT_ON/OFF
DIMMING
24V_VCC_AU
S25
S8
PIN11
CN2
12
11
10
9
8
7
6
5
4
3
2
1
W/B2CABLE
