Circuit Descriptions
7.
7.2
Power Supply
Refer to figure
for the power architecture of this
platform.
Figure 7-3 Power Architecture
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.
Important delta’s with the QM16.3A LA classis platform are:
•
New power architecture for LED backlight
•
“Boost”-signal is now a PWM- continuous variable.
The control signals are:
•
PS-ON
•
Lamp “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:
•
+3.7V output for 715G7732P(standby mode)
•
+3.5V output for 715G7831P(standby mode)
•
+8.5V output for
715G7831P/715G7831P/715G6679P/715G6677P/715G6
973P(standby mode)
•
70V(Boost for backlight for 715G7720)
•
+12 output (on-mode)
•
+12V_audio (audio AMP power)
•
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/EEFL backlight: power panel is conventional IPB
•
LED backlight:
- side-view LED without scanning: PSL power panel
- side-view LED with scanning: PSLS power panel
- direct-view LED without 2D-dimming: PSL power panel
- direct-view LED with 2D-dimming: PSDL power panel.
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.
20150_201.eps
Display power
Platform
MT5593U
PFC
Platform power
1 power- PCB
LVDS AMP
Low stby
power
Ac-input + Mains filter
BL-ON/OFF
AC IN
CN9901
CN8601(FOR 715G7831/715G6679/715G7720)
CN8103(FOR 715G7854)
CN8101(FOR 715G6677/715G6973)
DIM
12V_A
12V
PS_On
12V
CN1190
AMP
12V
