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)
7.2.2
USB Interface
The SOC has one input port for USB.
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.
7.4
Circuit Description
7.4.1
System power
The main board power is received at connector CN5 from
power board, to receive the power and signals from the PSU.
See
for the correct pining.
Figure 7-3 Connector CN5 overview
7.4.2
System power
The main board power is received at connector CN5 from
power board, to receive the power and signals from the PSU.
See
for the correct pining.
MEDIATEK
USB Host
Interface
19560_204_1
3
0909.ep
s
1
3
0909
19560_20
3
_1
3
0909.ep
s
1
3
0909
power c
ab
le
24V_VCC_AU (N/A 22" models)
DIMMING
5V_STBY
CN5
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
3V3_STBY_1
12V_STBY
12V_STBY
12V_STBY
3V3_VCC
3V3_VCC
power_pin11
S211
BACKLIGHT_ON/OFF
STBY_ON/OFF
STBY_ON/OFF_NOT
S212
24V_VCC_AU
S115
power_pin1
power_pin3
nc
