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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 returned for repair,
unless the main fuse of the unit is broken. Always replace the
fuse with one of the correct specifications! This part is
commonly available in the regular market.
Three different PSU can be used in this chassis:
•
32" sets use a "Delta" PSU
•
42" sets use a "PPS" (Philips Power Solutions) PSU
•
52" 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
MICRONAS
AUDIO PROC.
FLASH
MEM
Figure 9-2 SSB bottom view
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COMMON INTERFACE
CHANNEL
DECODER
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 (mounted on-board the SSB) generates the +5 V
(+5V_SW) from the +5 V (+5V_STANDBY) supply voltage.
They deliver the following voltages to the board:
•
+3.3 V (+3V3_STBY)
•
+5 V (+5V_SW)
•
+3.3 V (+3V3_SW)
•
+34 V (+VTUN)
•
+2.5 V (+2V5_SW)
•
+1.8 V (+1V8_SW)
•
+1.2 V (+1V2_SW)
An overview can be found in figure "DC-DC converter block
diagram".
9.
EN 93
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