Philips 19HFL3007D/10 Service Manual page 32

EN 32 7. TPM9.3HE LA
7.3 DC/DC Converters
The on-board DC/DC converters deliver the following voltages
(depending on set execution):
• +5V2-STANDBY, permanent voltage for the Stand-by
controller, LED/IR receiver and controls;
• +12V, input from the power supply for the panel common
(active mode);
• +24V, input from the power supply for the amplifier;
• +1V1, core voltage supply for MTK5366; has to be started
up first and switched "off" last
• +1V2, from the power supply for the scaler IC MT5366
16V_24V
16V_24V
+12V
STB_PWR5V
7.4 Front-End Analogue and DVB-T, DVB-C,
ISDB-T reception
7.4.1 Front-End Analogue part
The Front-End for the analogue tuner consist of the following
key components:
• ENV57U09D5F
• MT5366IVGG/B PBGA-479
Below find a block diagram of the front-end application for
analogue.
2012-Sep-28
Circuit Descriptions
POWER SWITCH
AON4421
Q7007
PWR_ON/OFF
LDO
7812
+5V_SW
POWER SWITCH
+5VSB
SI5441
Q7002
DV11
Figure 7-3 DC/DC converters
• +1V5, supply voltage for DDR3 (diagram B)
• +3V3, general supply voltage
• +5V-TUN, supply voltage for tuner
• +5V-USB, input intermediate supply voltage for USB
Power
• +3V3 from the power supply for the scaler IC MT5366
See figure
DC/DC converters.
AUDIO AMP
AUDIO _PVDD
STA381BW
RF TUNER
LDO
+5V1_TUN
ENV57U09D5F
+5V_SW
7805
/TDTK-G731D
LCD PANEL T-CON
POWER SWITCH
LVDS_VDD
+12V
AON4421 LCD PANEL
+5V_SW
Q7004
PANEL_VCC_ON/OFF
USB multi-media MAIN CHIP
POWER SWITCH
USB PWR
+5V_SW
G5250
U4009/U4012
USB_PWR_OCP0
TMDS SWITCH
+5V_SW
TMDS361
PCMCIA CARD
LDO
CI2_VCC
CI CARD PWR
+5V_SW
G5250
CI_PWR_EN
BUCK CONVERTER
DV33 & AV33
+5V_SW
TPS54319
LDO
DV33
G1117T43U
LDO
DV33
G1084TU3
LDO
5135_DV10 5135_DV10
+5V_SW
G9141
Figure 7-4 Front-End analogue block diagram
back to
div. table
7-3 DC/DC converters for a detailed setup of the
MAIN CHIP DVB-C/T DEMOD
DV33
MT5366 MT5135
MAIN CHIP
DV15_DDR DV15_DDR
MT5366
MAIN CHIP
DV12/AV12 AV12
MT5366
DVB-C/T DEMOD
MT5135
AUDIO AMP
DV33
STA381BW
DDRIII X 2
DV15_DDR
NT5TU64M16
DVB-C/T DEMOD
AV12
MT5135
19380_202_120911.eps
120925
19240_204_120224.eps
120224