Philips 8000 Series Service Manual page 46

EN 46 7. Q551.1E LA
7.2 Power Supply
Refer to Figure 7-9 for the power architecture of this platform.
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 TV543 platform are:
• New power architecture for LED backlight (PSL, PSLS,
PSDL)
• "Boost"-signal is now a PWM-signal + continuous variable.
The control signals are:
• Stand-by
• Lamp "on/off"
• DIM (PWM) (not for PSDL)
• Boost (PWM except for IPB)
• Power-OK: indicates that the main converter is functioning
(feedback signal to the SSB).
In this manual, no detailed information is available because of
design protection issues.
The output voltages to the chassis are:
• +3V3-STANDBY (Stand-by mode only)
• +12V (on-mode)
• +Vsnd (+24V) (audio power) (on-mode)
• +24V (bolt-on power) (on-mode)
2010-Jun-25
Circuit Descriptions
Figure 7-9 Power Architecture TV550 platform
7.2.2
back to
div. table
• 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.
Diversity
The diversity in power supply units is mainly determined by the
diversity in displays. Refer to the Spare Parts list for the correct
order number.
The following displays can be distinguished:
• 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.
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