Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 105
FTP2.2U AA
9.
Power States
There are four different power states. Their characteristics are
summarised in the "Power states" table.
Note:
•
All regions use a red LED for STANDBY and a blue LED for
ON. Otherwise, there is no visible difference between OFF
and STANDBY.
•
In SEMI-STANDBY coming from STANDBY, the blue LED
is "on",
•
In SEMI-STANDBY coming from ON, the red LED is "on".
Table 9-3 Power states
(1) Standby, entered via the remote or via a protection. A
special case of STANDBY state is the SERVICE STANDBY
STATE. A service engineer with a "ComPair/Dealer Service
Tool" can enter it. In this state, an IR LED can be used for
Diagnostics (for reading error codes). It is the starting condition
for the “stepwise start-up".
Figure 9-5 Power state diagram
•
OUT:
The set is OUT when the mains cord is disconnected.
When the mains cord is connected, the set goes to OFF or
to STANDBY state, depending on the last status in the
NVM. From all states, the set can be set to the OUT state
by disconnecting the mains cord or by a mains interruption.
•
OFF:
In the OFF state, the OTC is powered but is in low
power STANDBY state. No LEDs are "on", RC6 is ignored,
no EPG or P50 is possible, Proximity is set to "off", time
extraction is not started (if it was done before this state, the
clock stays running). The tact switch can only change this
state; the set goes via SEMI-STANDBY to ON. From all
states, we can go to the OFF state by the tact switch.
•
STANDBY:
The set is in STANDBY if the STANDBY bit is
set. This state can change with the RC6 "on" command, for
EPG loading, P50 recording, for time extraction, or for
ambient light. The next state is SEMI-STANDBY and to ON
if the STANDBY bit is not set.
•
SEMI-STANDBY:
State between STANDBY or OFF and
ON state. All supply voltages are present, but the screen
is blanked.
•
ON:
set is ON.
POR detection
Situation in 2003:
•
After all the supply lines are available, the supply
generates a POWER_OK signal (active "low"). This signal
is used as POR to mute the sound as long as this line is not
"low". The POR is inverted (called ROP) and is used to
mute the sound as long as the POWER_OK is "low".
Changes in 2004:
•
A POK (Power OK) signal is generated by the supply when
all the voltages are within specs. This line is used as
POR_FLASH for the OTC.
•
For "anti-plop", a transistor generates a signal. The
collector is via a resistor connected to the +5V2, the base
is connected to the POK signal. The collector signal follows
the 5V2 until the POK is high. The transistor conducts, the
collector becomes "low", and the sound will be de-muted.
Start-up sequence
1.
When the mains is connected, the standby supply delivers
5V2 to the Small Signal Board, 3V3 to the display control
electronics, 20 V for the Vs converter (25VHOT), and 9 V
for the relays.
2.
When the TV set goes from STANDBY/OFF to ON mode,
the STANDBY signal line is made "low" by the SSB. Relay
1450 closes, sending the mains to the pre-conditioner. The
pre-conditioner starts up and delivers 390 V_dc.
3.
The SSB has also a signal line running towards the display
electronics called CPUGO, it is part of the LVDS cable.
This signal is driven by the STANDBY line via a simple
inverter. So CPUGO is made "high", which retrieves the
display out of its low power mode.
4.
The OTC on the SSB sends an I
2
C command to the display
in order to start up. The display in turn makes the VCEGO
signal line towards the power supply "high" after it has
verified that the Vcc supply voltage is indeed still "low".
5.
The Vs converter, which was already supplied with 400 V
by the pre-conditioner and with around 20 V by the standby
supply (25VHOT), is enabled by optocoupler 7003. It
generates 65 V at the Vs_unsw output and around 24 V at
the 30 V auxiliary output. Further the Vcc converter is
started up delivering 5.1 V typical to the display. Also the
12 V converter starts up.
6.
The display monitors the Vcc voltage. On condition Vcc
becomes "high" and Vs and Va are still "low", it applies the
analogue control voltages Vrs and Vra to the supply and
makes VSAGO high.
7.
The display monitors Va and Vs, it waits 5 seconds for Va
to rise above 29 V and Vs to rise above 69 V. If successful,
the power supply is fully started up. If the 5 seconds run
out, the display shuts down and retries the procedure from
the beginning.
Power States
Switch PDP
OUT (Mains cord
disconnected)
X
No power.
OFF
OFF
Standby supply is working.
Main supply not working.
2003: OTC is not powered.
2004: OTC is powered and is in low
power standby.
No LED is "on".
No P50 or EPG (Europe).
Proximity sensor is "off".
No time extraction started.
No ambient light.RC6 ignored.
STAND BY (1)
ON
Standby supply is working.
Red LED is "on".
SEMI STAND BY
(Going to ON)
ON
Standby supply is working.
Main supply is working.
PDP is "on" and blanked.
EPG loading and P50 recording are
possible (Europe).
Time extraction.
2003: Red and Green LEDs are "on".
2004: Blue LED is "on".
ON
ON
The set is working.
2003: Green LED is "on".
2004: Blue LED is "on".
SEMI STAND BY
(Coming from
ON)
ON
Standby supply is working.
Main supply is working.
PDP is "on" and blanked.
EPG loading and P50 recording are
possible (Europe).
2003: Red and Green LEDs are "on".
2004: Red LED is "on".
SEMI STAND BY
AMBIENT LIGHT
ON
ON
Standby supply is working.
Main supply is working.
PDP is "on" and blanked.
Red LED is "on".
E_14620_020.eps
290404
OUT
ON
Semi Standby
OFF
Standby
