Philips 4500 Series Service Manual page 21

7.2 Power Supply
Refer to figures Figure 7-2
platform.
Display Power
CN8601 (for 40'' )
CN8101 (for 50''/55'' )
PFC
( for 50''/55'')
7.2.1 Power Supply Unit
All power supplies are a black box for Service. When defective,
a new board must be ordered and 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 TPS15.2A LA classis platform are:
• New power architecture for LED backlight
• "Boost" signal is now a PWM-signal + continuous variable.
The control signals are:
• Stand-by
• 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:
• +12V(on-mode), +8.5V(Stand-by mode)
• +12V_Audio (on-mode),+8.5V_Audio(Stand-by mode )
• +22V for 40", +36V/+24V for 50"/ 55" (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:
for the power architecture of this
Platform power
BL-ON/OFF
DIM
12V
Lower Stby
Power
AC input +
Main filter
AC IN
Figure 7-2 Power Architecture (4500 series)
Circuit Descriptions
AUDIO
AMP
CN701
1 power-PCB
• CCFL/EEFL 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.
back to
div.table
TPS15.2A LA 7.
LVDS
12V 12V
Platform
MST6852LP
EN 21
19910_201.eps
2015-May-01