Power Supply - Philips MG8 Service Manual

EN 104 9. Q522.2E LA
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 > 32").
9.2.2 Diversity
Below find an overview of the different PSUs that are used:
Table 9-1 Supply diversity
Supplier PSU
BPS PLCD170PS09
BPS
LIPS250PS04
Delta DPS-279BP A
BPS LIPS250PS02
BPS LIPS250PS01
LGIT PLHL-T722A
9.2.3 32" PSU (BPS PLCD170PS09)
Control Signals
The control/output signals are driven by open collector/open
drain type circuits. The drive requirements are 3V3 Logic. Open
Collector: 2.2K ohms pull up resistor to +3V3.
Signal Levels:
• Low or open: less than 0.4V.
• High: more than 2.4V.
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 12Vssb +Vaudio
Nominal voltage 3.3V
Voltage tolerance ± 3%
Min. Current (A) 0
Nom. Current (A) 0.2
Max. Current (A) 0.2
Peak Current (A) TBD
Ripple and noise 50mV
Ground GND1
Circuit Descriptions, Abbreviation List, and IC Data Sheets
Model Input Voltage Range
32" 768p High Mains (196- 264 Vac)
37" 768p High Mains (196- 264 Vac)
Universal (90- 270 Vac)
37" 1080p
42" 768p High Mains (196- 264 Vac)
42" 1080p High Mains (196- 264 Vac)
47" 1080p High Mains (196- 264 Vac)
12Vssb Vaudio 24V Note
OFF OFF OFF Standby
ON OFF OFF Semi-standby
ON ON ON ON
Vo2 Vo3 Vo4 Vo5
-Vaudio 24Vinv
12V + 12V - 12V 24V
± 5% -5%, +10% -5%, +10% ± 5%
0.1 0 0 0
2.7 0.45 0.45 4
2.7 2.5 2.5 5
3.5 2.5 2.5 6.3
100mV 100mV 100mV 200mV
GND1 GND2 (isolated gnd) GND3
(isolated gnd)
Table 9-4 "Standby #" is "low" (Semi-standby mode)
Description Vo1
Symbol 3V3 stdby 12Vssb + Vaudio
Nominal voltage 3.3V
Voltage tolerance ± 3%
Min. Current (A) 0
Nom. Current (A) 0.2
Max. Current (A) 0.2
Peak Current (A) TBD
Table 9-5 "Standby #" is "high" (Standby mode)
Description Vo1
Symbol 3V3 stdby 12Vssb + Vaudio
Nominal voltage 3.3V
Voltage tolerance ± 3%
Min. Current (A) 0
Nom. 0.015
Start-up Sequence
Note : Standby # is from small signal board (SSB).
Figure 9-3 Rise and fall sequence 32" 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 current limit or fuse.
– Over voltage protection should operate within 120% ~
140% of nominal value.
• Vaudio
– Short circuit protection with current limit or fuse.
– Over voltage protection should be less than absolute
value 19V.
• 24 output
– Short-circuit proof with auto restart.
– Over voltage protection should operate within 120% ~
140% of nominal value.
Vo2 Vo3 Vo4 Vo5
- Vaudio 24Vinv
12V + 12V - 12V 24V
± 5%
11.4~17V -11.4~ -17V ± 5%
0.1 0 0 0
2.7 0 0 0
2.7 0 0 0
3.5 0 0 0
Vo2 Vo3 Vo4 Vo5
- Vaudio 24Vinv
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
I_18010_080.eps
120608