“Off” To “Semi Standby” Flowchart - Philips FJ3.0E Service Manual

Service Modes, Error Codes, and Fault Finding
action holder: MIPS
action holder: St-by
autonomous action
The audio protection circuit shuts down the supply
autonomously. This triggers a set restart and during that restart
(so at this check here), it will be observed that the audio
protection line is high and the audio protection mode is entered.
This condition is not valid for an SDI PDP. In this PDP set, the
audio protection latch is not present and hence the HIGH
condition here will never be observed. As a result, when an
audio protection occurs, the set will restart and will enter a
supply protection mode because of a missing power supply.
Switching on the power supply in an LPL scanning
backlight set, also switches on the backlight supply.
The display should not be used the first 5 seconds
the backlight supply is running due to a pre-heat time
of 4s and a 100% light output (not adjustable) the next
second. This 5 second delay does not delay the startup
of the display as this time is absorbed in the startup time
of the rest of the system.
No
- Only when the PDPGO is low, a retry should be
considered (the PDP could have reset internally). If
the PDPGO is already high, there is no use in trying
to restart.
- PDPGO line is pulled high in all non FHP sets so
this extra startup delay in case of a fault condition
is not valid.
- Switching the PDPGO high will give a visual
artefact and should only be done if really
necessary.
To part B
Off
Mains is applied
Standby Supply starts running.
+5V2, 1V2Stb, 3V3Stb and +2V5D become present.
In case of PDP 3V3 Vpr to CPU PDP becomes present.
st-by µP resets
All I/O lines have a High default state:
- Assert the Viper reset.
- Sound-Enable and Reset-Audio should remain high.
- NVM power line is high, no NVM communication possible.
Initialise I/O pins of the st-by µP, start keyboard scanning, RC
detection, P50 decoding. Wake up reasons are off.
PDPGO line is high (either HW wise in a non FHP set or
because of the stby µP reset in a FHP set) which is the good
state at cold boot to be able to start the FHP.
Audio Protection Line
HIGH?
No
Switch LOW the NVM power reset line. Add a 2ms delay
before trying to address the NVM to allow correct NVM
initialization.
Switch ON all supplies by switching LOW the POD-MODE
and the ON-MODE I/O lines.
+5V, +8V6, +12VS, +12VSW and Vsound are switched on
Wait 50ms and then start polling the detect-
5V, detect-8V6 and detect-12V every 40ms.
detect-5V
received within 2900 ms after
POD-MODE I/O line
toggle?
Yes
activate +5V supply detection algorithm
detect-12VSW received within
2900 ms after POD-mode I/O
line toggle?
Yes
activate +12VSW supply
detection algorithm
No need to wait for the 8V6 detection at this point.
Enable the +1V2 supply (ENABLE-1V2)
To part B
Figure 5-6 "Off" to "Semi Standby" flowchart (part 1)
FJ3.0E LA
Stand by or
Protection
If the protection state was left by short circuiting the
SDM pins, detection of a protection condition during
startup will stall the startup. Protection conditions in a
playing set will be ignored. The protection mode will
not be entered.
- Switch Sound-Enable and Reset-Audio high.
They are low in the standby mode if the
standby mode lasted longer than 10s.
Yes
Audio Error
SP
Switching the POD-MODE
low in an FHP PDP set
makes the CPUGO go high
and starts the PDP CPU.
The availability of the supplies is checked through detect signals (delivered by
dedicated detect-IC's) going to the st-by µP. These signals are available for
+12V, +8V6, +5V, +1V2 and +2V5. A low to high transition of the signals should
occur within a certain time after toggling the standby line. If an observers is
detected before the time-out elapses, of course, the process should continue in
order to minimize start up time.
PDPGO
No
=
High?
No
Switch PDPGO high:
PDP should start: 5V, 8V6 and
12V are activated
detect-5V
received within
Yes
2900 ms after PDPGO
toggle?
No +12V error
SP
detect-8V6 received
within 6300 ms after POD-mode I/O line
toggle? Startup shall not wait for this
detection and continue startup.
No
To part B
5. EN 35
Switching the POD-MODE and the
ON-mode low in an SDI PDP set
makes the PDP supplies go to the
ON mode.
Yes
No +5V error
SP
Yes
To part B
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