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Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2
LCD Power Supply
The Power Supply Unit (PSU) in this chassis is a buy-in and is
a black-box for Service. When defective, a new panel must be
ordered and the defective panel must be sent for repair, unless
the main fuse of the unit is broken. Always replace the fuse with
one with the correct specifications! This part is available in the
regular market.
Three different PSU can be used in this chassis:
•
26 and 32 inch sets use a "Delta" PSU
•
37 and 42 inch sets use a "PPS" (Philips Power Solutions)
PSU
•
47 inch sets use a "Delta" PSU.
Figure "Overview of PSU connectivity" shows the connectivity
of the Power Supply Unit with the other panels in the set.
Figure 9-3 Overview of PSU connectivity
All Power Supply Units deliver the following voltages to the
chassis:
•
+24 V to the inverters
•
+12 V to SSB
•
+12 V and -12 V to Audio Supply
•
12 V to Bolt-on Supply (where applicable)
•
+5.2 V Standby voltage.
9.3
DC/DC converters
A switch generates the +5.2 V (+5V_SW) from the +5.2 V
(+5V_STANDBY) supply voltage. For LCD sets, this switch is
mounted on-board the SSB. For PDP sets, this switch is
mounted on the Power Supply Panel. This results in the
+5V_STANDBY (and +5V_SW for PDP sets) voltage(s),
coming from the Power Supply Unit, is (are) used as input for
the on-board DC/DC converters.
They deliver the following voltages to the board:
•
+3.3 V (+3V3_STBY)
•
+5.2 V (+5V_SW) (only for LCD sets)
•
+1.8 V (+1V8S_SW)
•
+34 V (+VTUN)
•
+3.3 V (+3V3_SW)
•
+3.3 V (+3V3_MOJO)
•
+1.2 V (+1V2_MOJO)
An overview can be found in figure "DC-DC converter block
diagram".
9.4
Front-End
This chassis uses different tuners depending on the region and
execution. An overview of the different executions can be found
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310107
in table "Tuner diversity".
Table 9-1 Tuner diversity
Region
Europe
AP
China
Latam
For a general outline of tuner applications in this chassis see
figure "Tuner IF diagram".
In the LC7.1x chassis (analogue sets), the signal coming from
the tuner is fed to the IF demodulator (through the SAW filters)
and then passed to the Trident Video Processor.
9.4.1
Video IF Amplifier
The IF-filter is integrated in a SAW (Surface Acoustic Wave)
filter. One for filtering IF-video (item 1102) and one for IF-audio
(item 1103). The type of these filters depends on the
standard(s) received (region-dependency). Some filters can be
switched to another standard, what makes them suitable for
applications in multi-standard platforms. An overview of the
SAW filter diversity can be found in table "SAW filter diversity".
LC7.1A LA
Figure 9-4 DC-DC converter block diagram
Tuner
TD1316AF
UV1318S
UV1316E
TEDE9
UV1338
Video
SAW filter
Audio
Tuner
SAW filter
RFAGC
Supply
I 2 C
Digital IF
+5V/+33V
36.16MHz
4MHz
IF AGC
Figure 9-5 Tuner IF diagram
9.
EN 91
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Type
hybrid
analogue
analogue
analogue
analogue
CVBS
IF Demodulator
2
nd
SIF
RF AGC_analogue
RF AGC_digital
I 2 C_analogue
Switch IC
I 2 C_digital
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020207
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