Power Supply Unit; Power Supply Samsung Pdp (Sdi); Power Supply Fujitsu Pdp (Fhp); Aux Supply - Philips 50pf9966 Service Manual

Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2

Power Supply Unit

9.2.1

Power Supply Samsung PDP (SDI)

General
Supply PDP (SDI) 2004
Supply + SCREEN
110-230V
STBY
SUPPLY
SWITCH
RELAYS +
PRE COND
Overvoltage prot

AUX SUPPLY

Overcurrent prot
Va/Vs
Vscan
Ve/Vset
PDP
DC-PROT
Figure 9-3 Block diagram PDP (SDI) power supply
The Power Supply of SDI PDPs is a buy-in PSU. This Power
Supply is divided in 2 parts:
•
One PSU for the PDP itself (incl. the Standby Supply).
•
One "sub" PSU for the SSB.
For Service the Power Supply is a black box. When defective
(this can be traced via error-codes in the error buffer, or by
strange phenomena), a new panel must be ordered and after
receipt, the defective panel must be send for repair.
Standby Supply
The Standby Supply is directly connected to the mains, there is
no mains switch.
•
US: the mains input has a polarisation that is requested for
the USA together with a polarised mains cord. The neutral
is connected to the mains neutral.
•
EU/AP: A non-polarised cord is used for these regions.
Changes in 2004:
There is no ON/OFF switch, the +9V_STDBY is always
connected to the switching part.
Switch
The +9V_STBDBY_SW is routed to the "switch" part in the
supply. This part generates the 5V2_STDBY_SW to the OTC
supply (which generates its own reset).
The +3V3_STDBY_SW is not used on the SSP, it is only used
for the CPU of the plasma panel.
Relays and Pre-conditioner
If the STANDBY bit in the OTC is zero, the STANDBY line is
"low", and the relay in the supply connects the mains voltage to
the AUX supply.
For the US region, the mains voltage is doubled.
SSB
+9V-STDBY
+9V-STDBY-SW
+5V2-STDBY-SW
+3V3-STDBY-SW +3V3
STANDBY
OTC
PDP-GO
INV
POR
+8V6
+5V
+12V
POWER-OK
EPLD
Mute
gen.
MUTE
DC/DC
+12V 3V3
+16-19V
-16-19V
Class D
Amplifier
E_14620_009.eps
280404
The OTC delivers a PDP-GO signal to the PDP when the set is
not in standby.
Aux Supply
This is an LLC supply that delivers the Va, Vs, Vscan, Ve, and
Vset directly to the PDP.
Changes in 2004:
•
The voltages +12V, +8V6, +5V, and the tuner supply are
derived from the PDP supply. The +3V3 is generated by
the DC/DC converter on the SSP.
•
The AUX supply delivers a POWER_OK signal to the
EPLD (is not used by the EPLD). This signal is used as
POR signal to prevent audible plops, and by the OTC to
guarantee a proper "switch off" (via the mains plug).
•
The +V and -Vsound are routed to the class D audio
amplifier. The DC_PROT signal from this amplifier goes
directly to the supply and causes a hardware protection.
•
The AUX supply has its own over-voltage and over-current
protection.
TACT
switch
9.2.2

Power Supply Fujitsu PDP (FHP)

Note: In the following text, the model year 2003 refers to the
FTP1.x chassis, while the model year 2004 refers to the new
FTP2.x chassis.
General
Supply PDP (FHP) 2004
Supply
110-230V
Overvoltage prot
Overcurrent prot
Vss 5cv
SCREEN
Figure 9-4 Block diagram PDP (FHP) power supply
Changes in 2004:
•
Switched 3V3 and 5 V on Standby Supply not necessary
anymore: a tact switch replaces the ON/OFF switch.
2
•
No I
•
No fan control anymore.
•
Over-voltage protection omitted on the 12 V supply.
•
3V3 protection becomes 12V protection.
FTP2.2U AA
SSB
STBY
+9V-STDBY
SUPPLY
+9V-STDBY-SW
3V3
+5V2-STDBY
SWITCH
+3V3-STDBY-SW
RELAYS +
Stand-by
PRE COND
INV
Vtune
+8V6
VCC+5V
AUX SUPPLY
+12V
POWER-OK
Va/Vs
Vce_go Vsa__go
MUTE
CPU 5V/3V3
T˚
sensor
PDP-GO
PDP
+12V
+18V
DC-PROT
-18V
Class D
Amplifier
C I/O expander anymore for fault reading.
9. EN 103
+3V3
OTC
TACT
switch
POR
POR generator
EPLD
I2C
DC/DC
3V3
POWER OK
VS unsw
VA
VCC 5V
12V
DC prot
E_14620_008.eps
280404