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Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2
Power Supply
All power supplies described below are a black box for Service.
When defective, a new board must be ordered and the
defective one must be returned, unless the main fuse of the
board is broken. Always replace a defective fuse with one with
the correct specifications! This part is available in the regular
market.
Consult the Service website for the order codes of the boards.
Below some extra information of each board is given, in order
to help to determine which part of the set is defective.
9.2.1
Specifications
There are two types of the power supply used in the TV522
platform:
•
Power Supply (PSU) - without inverter - (for 32").
•
Integrated Power Board (IPB) - incl. inverter - (for 22 and
42").
9.2.2
Diversity
Below find an overview of the different PSUs that are used:
Table 9-1 Supply diversity
Supplier
PSU
Delta
DPS-279BP A
BPS
PLCD170PS13
BPS
LIPS250PS05
9.2.3
22" PSU (DPS-279BP A)
Description
This power supply delivers four DC and four AC outputs:
•
3.3 V/ 200 mA DC for Standby
•
12 V/2.4 A DC for SSB power supply
± 12 V/200 mA DC for Audio power supply
•
•
Four identical AC power supplies for driving the backlights.
The Power Supply Unit is controlled via a digital input "Standby
# (Stdby)" and the "BL_ON-OFF" signal at the secondary side.
Table 9-2 Mode of operation
Standby# BL_ON-OFF
3V3
CN7 pin 5
High
Low
ON
Low
Low
ON
Low
High
ON
Output Specifications
Table 9-3 "Standby #" is "low" (ON mode)
Description
Vo1
Symbol
3V3 stdby
Nominal voltage
3.3V
± 3%
Voltage tolerance
Min. Current (A)
0
Nom. Current (A)
0.2
Max. Current (A)
0.2
Peak Current (A)
0.5
Ripple and noise
50 mV
Ground
GND1
Power
0.66 W
Model
Input Voltage Range
High Mains (198- 264 Vac)
22"
32"
High Mains (196- 264 Vac)
High Mains (198- 264 Vac)
42"
12Vssb Vaudio 24V
Note
OFF
OFF
OFF
Standby
ON
OFF
OFF
Semi-standby
ON
ON
ON
ON
Vo2
Vo3
Vo4
+Vaudio
−Vaudio
12Vssb
+12V
−11.4V
12V
± 5%
−5%, +10%
± 20%
0.1
0
0
2.4
0.2
0.2
2.4
0.45
0.45
3.0
1.2
1.2
100 mV
100 mV
100 mV
GND1
GND2 (isolated gnd)
28.8 W
4.8 W
4.8 W
Q522.3E LA
Table 9-4 "Standby #" is "low" (Semi-standby mode)
Description
Vo1
Vo2
Symbol
3V3 stdby 12Vssb + Vaudio
Nominal voltage
3.3V
12V
Voltage tolerance ± 3%
± 5%
Min. Current (A)
0
0.1
Nom. Current (A) 0.2
2.7
Max. Current (A) 0.2
2.7
Peak Current (A) TBD
3.5
Table 9-5 "Standby #" is "high" (Standby mode)
Description
Vo1
Vo2
Symbol
3V3 stdby 12Vssb + Vaudio
Nominal voltage
3.3V
0
Voltage tolerance ± 3%
0
Min. Current (A)
0
0
Nom.
0.015
0
Start-up Sequence
Note: All timing measurements are based on system loading.
Figure 9-3 Timings 22" PSU
Protections
•
3V3 stdby output
–
Short-circuit proof with auto restart.
–
Over voltage protection should operate within 120% ~
140% of nominal value.
•
12Vssb
–
Short circuit protection with shut down and latch off.
The output will recover by turning AC off, removing the
short circuit and turning on the AC again.
–
Over voltage protection should operate within 120% ~
140% of nominal value.
•
Vaudio
–
Short circuit protection with shut down and latch off.
The output will recover by turning AC off, removing the
short circuit and turning on the AC again.
–
Over voltage protection should be less than absolute
value 19V.
•
No load
–
No unwanted conditions will occur.
•
Fuse protection
–
The power supply is protected against AC over current
by a fuse.
•
Over voltage protection
–
The power supply is protected against AC over voltage
up till 400 V ± 10%.
•
Short lamp protection
–
The DC and AC output will be switched off when the
AC lamp output is shorted to GND. The output will
recover by turning AC off, removing the short circuit
and turning on the AC again.
•
Open lamp protection
9.
EN 103
Vo3
Vo4
- Vaudio
+ 12V
- 12V
11.4~17V
-11.4~ -17V
0
0
0
0
0
0
0
0
Vo3
Vo4
- Vaudio
0
0
0
0
0
0
0
0
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