Philips 19HFL3233D/10 Service Manual page 26

EN 26 7. TPM8.2E LA
7.2 Power Supply
7.2.1 Power Supply Unit
Before checking other parts first check whether fuse on the
PSU is not broken. Always replace a defective fuse with one
with the correct specifications! This part is available in the
regular market.
Consult the Philips Service web portal for the order codes of the
boards.
7.3 Power Management
PWR_18V
PER_12V
STB_PWR5V
The on-board DC/DC converters deliver the following voltages
(depending on set execution):
• +5V-STANDBY, permanent voltage for the Stand-by
controller, LED/IR receiver and controls; connector CN701
pin 11 and 12.
• +12V, input from the power supply for T-con, audio amp in
SCART out; connector CN701 pins 3 and 4.
• +18V, input from the power supply for audio (in active
mode); connector CN701 pins 8 and 9.
2011-Jun-01
Circuit Descriptions
POWER SWITCH
PWR_18V
AON4421
Q705
PWR_ON
POWER SWITCH
PWR_12V
AON4421
+5V_STB
Q751
PANEL_VCC_ON/OFF
BUCK CONVERTER
DV11 & VCCK
+5V_STB
TPS54319
U701
OPWRSB
LDO
DV33SB
+5V_STB
LM1108
U705
POWER SWITCH
+5V_STB
AON4421
Q702
DV11
+5V_SW
+5V_SW
BUCK CONVERTER
+5V_SW
+5V_SW
Figure 7-3 Power Architecture
The output voltages to the chassis are:
• +5V-STANDBY (Stand-by mode only)
• +12V (on-mode)
• +18V for audio circuit
7.2.2 Diversity
The diversity in power supply units is mainly determined by the
diversity in screen sizes, but please note to always order the
correct replacement.
LDO
TJ4220G
DP
U706
LDO
G5250M1
T1U
U1006
CI_PWR_EN
DV33 & AV33
TPS54319
U702
LDO
AZ1117D
DV33 DV15_DDR
U703
LDO
AV33 AZ1117D AV12
U704
LDO
5135_DV10
G9141
U1015
Regulator
OPAV120
L78L12BUTR
U604
LCD PANEL T-CON
+18V
+5V or +12V
PANEL
MAIN CHIP
VCCK
MT5366
U401
MAIN CHIP
DV33SB
MT5366
U401
USB multi-media
USB PWR
+5V_USB
CN103
RF TUNER
W/ SAW
+5V_TUNER
TDTK-G731D
TU102
PCMCIA CARD
CI CARD
CI2_VCC
PWR
CN159
MAIN CHIP
AV33
MT5366
U401
DDRIII
MAIN CHIP
DV15_
DV15_
DDR K4B1G1646E
DDR MT5366
U401
MAIN CHIP DVB-C/T DEMODULATOR
AV12
MT5366
AV12 MT5135
U401
DVB-C/T DEMODULATOR
5135_DV10
MT5135
U1011
AUDIO Mux
CD4052BPW
U605
AUDIO AMP
TPA5717A
U602
DVB-C/T DEMODULATOR
DV33
MT5135
U404
U1011
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