Philips Q528.1E - 32 And 37” Sets; Block Diagram Display Supply 32 and 37”; Display Supply; Power-Good Circuitry

Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 124 Q528.1E LA9.
9.2 Display Supply
9.2.1 32 and 37” Sets
The 32 and 37” sets in this chassis come with a serviceable
Display Supply Unit. This supply unit delivers the power for the
display, AmbiLight unit and the optional panel (bold-on) for
Dynamic Frame Insertion (DFI). Refer to chapter “Circuit
Diagrams and PWB Layouts”, diagrams A1 and A2.
The power supply for the SSB and Audio part are located on
the SSB itself (on-board Platform Supply). For a description,
refer to Section “On-board Platform Supply”.
The supply unit delivers the following voltages to the chassis:
• 12 V for bold-on panel (optional), LCD panel and AmbiLight
(optional)
• 15 V for AmbiLight
• 24 V (or 295 V in case of scanning backlight) for lamp
inverters.
For a block diagram see figure ”Block diagram Display Supply
32 and 37”.
Figure 9-4 Block diagram Display Supply 32 and 37”
A Power-Good circuitry is built around items 7013 and 6024.
The so-called POWER-GOOD line indicates the correct
functioning of the 12 V supply. The voltage on this line is 5 V if
the voltage on the 12 V output is > 10 volt. Refer to figure
“Power-Good circuitry”.
Figure 9-5 Power-Good circuitry
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3078
2K2
RES
50V10u
2811
GND_COLD
6024
BZX384-C4V7
+12Vd
220R
3077
7013
GND_COLD
7013
BC857BW
+5V2
470R
3076
F407
POWER-GOOD
H_16800_126.eps
090507