Philips FTL2.1E Service Manual page 129

Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2 Power Supply LCD
9.2.1 General
Changes in 2004:
• All displays:
– The sound supplies are +18V and -18V.
– A loudspeaker DC protection is added (via TS7030 on
the Main Supply).
– A POK (Power OK) is generated when the 12V from
the Aux supply is stabilised.
– The STAND-BY supply is integrated in the Sound
Amplifier panel.
• For Sharp displays (32") only:
– 12V supply for the lamps i.s.o. 24V.
– 12V to 5V DC/DC converter on SSB.
9.2.2 Block Diagram
Supply LCD 2004
110-230V Block B
Block A
Relay Switch
Input filter
Relay Control
MUTE
GENERATOR
MUTE
Audio
Figure 9-3 Block diagram LCD power supply
Main Supply (Block "D")
Diversity
• Mains input voltage diversity (1308):
– EU: 198 - 264 V
– US: 108 - 132 V
– AP multi: 90 - 275 V
control IC and triac).
– China: 160 - 270 V
• Mains filter diversity:
– EU, China: 1 x mains filter + harmonic coil.
– US, AP: 2 x mains filter + inrush current resistor.
• Screen size diversity:
– One module for 30" to 37" sets.
– Two (almost identical) modules on one PWB for 42"
sets.
Specifications
• 12 V / 3 A on connector 1304 (for Ambient Light and to
generate +8V6).
• 24 V / 5 A for LCD backlight on connector 1304 (for Sharp
12 V, 9 A).
• +18V, -18V sound on connector 1M02.
• +8V6 (derived from +12V from the Main Supply, switched
"off" in Stand-by).
• Output voltage: over-voltage protection of resonant supply.
• Output current protection of resonant supply.
• Current protection at some safety fault conditions.
Stand-by mode
• The resonant supply is switched "off" via relay 1450 that is
driven by the Stand-by Supply (via connector 1305).
+24V lamp(+12V for Sharp)
+12V
Block C Block D
Rectifier LCD Aux +8V6
Doubler Supply
+18V Sound
-18V Sound
DC prot
V tuner
Block E
Stand By +5Vsw
Supply
+5V2
Stby
5Vrelay
5V2
3V3
POR
Blue LED
OTC
Stby LED
Audioprotect
TACT
switch
E_14620_010.eps
.
AC
(doubler).
AC
(auto doubler with AVS10
AC
.
AC
Outputs
• 130-400 V
1306).
• Mains over-voltage and safety protection for Stand-by
Supply (connector 1307).
Inputs
• Relay drive voltage (for STAND-BY/ON mode) on
connector 1305.
• DC_PROT signal to protect loudspeakers when there is a
DC voltage across the loudspeakers (1M02).
1304
12V
Opto
HOT
Control supply
070504
25V_HOT
(Startup)
1307
(RES)
1306
1305
Figure 9-4 Functional diagram Main Supply (one module)
Stand-by Supply (Block "E")
The Stand-by Supply is based upon the "Fly Back Converter"
principle. A description of this principle can be found in the
FM2x Service Manuals.
FTL2.1E, FTL2.2E
(full range) for Stand-by Supply (connector
DC
Audio Supply
DC prot
18V 1M02
Reference Heatsink
+24V
+12V
24V
COLD
GND_AUD
Resonant Trafo
Driver Trafo
MC34067P
+400V Doubler
+400V
Bridge
+400V
Rectifier
1
Stand By supply
Relais
HOT
COLD EUR / CHINA
Mains filter Mains Harmonic
Mains filter
HOT
COLD
9. EN 129
-18V
GND_SND
Heatsink
+12V
Heatsink
AVS10
US / APmulti
Bridge
Rectifier
Inruch
US / APmulti
EUR / CHINA
US / APmulti
1308
Mains input
E_14620_025.eps
100504