Philips 40PFT6709, LG715G7801 - Circuit Diagram and PWB Layout - A 715G6555 PSU

 

Ambilight will adjust the TV lights around according to the picture changing color and brightness in order to create a sense of the effect of being personally on the screen

Power Supply Unit

All power supplies are a black box for Service. When defective, a new panel must be ordered and the defective one must be returned, unless the main fuse of the panel is broken. Always replace a defective fuse with one with the correct specifications! This part is available in the regular market.
Important delta’s with the TPM14.2A 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)
No detailed information is available because of design protection issues.
The output voltages to the chassis are:
• +4V7-STANDBY (Stand-by mode only)
• +5V (Stand-by mode only) (for 65PUT8609)
• +12V (on-mode)
• +Vsnd (+12V) (audio power) (on-mode)
• +24V (bolt-on power) (on-mode).

DC/DC Converters
The on-board DC/DC converters deliver the following voltages (depending on set execution):
• +5V-STANDBY, permanent voltage for the Stand-by controller, LED/IR receiver and controls
• +12V, input from the power supply for the panel common (active mode)
• +12V, input from the power supply for audio amplifier
• +1V2, from the power supply for the scaler IC MT5591
• +1V5, supply voltage for DDR2 (diagram B03B)
• +3V3, general supply voltage
• +5V, supply voltage for USB and CAM
• +3V3-TUN, supply voltage for tuner
• +5V-USB, input intermediate supply voltage for USB
• +3V3 from the power supply for the scaler IC MT5591
• +12V input from the Power supply for the Ambilight common.

• 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.
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.

Circuit Diagram and PWB Layout - A 715G6555 PSU