Philips 20PHH4109/88 Service Manual page 43

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 TPN14.1E 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:
• +4V7-STANDBY (Stand-by mode only)
• +12V (on-mode)
• +Vsnd (+12V) (audio power) (on-mode)
• +12V (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:
• 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.
7.2.3 Connector overview
Table 7-1 Connector overview
Connector
Number CN9101
Description to SSB
Pin 14
1 DIM
2 On/off
3 PS_ON
4 n.c.
5 GND
6 GND
7 GND
8 GND
9 +12V-AUDIO LED1-
10 +12V-AUDIO LED1-
11 +12V_AL
12 +12V_AL
CN8501 CN9904 CN8101
to panel to SSB to panel
12 14 6
LED1+ DIM LED1
n.c. ON/OFF LED2
LED1- n.c. VLED+
LED1- n.c. VLED+
n.c. GND LED3
n.c. GND LED4
n.c. GND -
n.c. GND -
+12V-AUDIO -
+12V-AUDIO -
n.c. +12V -
LED1+ +12V -
Circuit Descriptions
Number
Description to SSB
Pin
13
14
7.3 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.
• 3V3, supply voltage for Keyboard.
• +12V, input from the power supply for the panel
common(active mode)
• +12V, input from the power supply for the AMP
• +1V5, from the power supply for the scaler IC NT72567
• +1V1, from the power supply for the scaler IC NT72567
• +1V5, supply voltage for DDR2 ( diagram B03B)
• +3V3, genenal supply voltage
• +5V, supply voltage for USB and CAM
• +3V3-TUN, supply voltage for tuner
• +3V3 from the power supply for the scaler IC NT72567
• +3V3-DVBS, clean voltage for DVB-S2 channel decoder
• +1V2-DVBS, core voltage for DVB-S2 channel decoder
Figures gives a graphical representation of the DC/DC
converters with its current consumptions :
back to
div. table
TPN14.1E LA 7.
Connector
CN9101 CN8501 CN9904
to panel to SSB
14 12 14
+12_AL - +12_AL
+12_AL - +12_AL
EN 43
CN8101
to panel
6
-
-
2014-Feb-21