Philips 37PF9631D/37, Руководство по обслуживанию

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Service Modes, Error Codes, and Fault Finding EN 18 EJ2.0U LA 5.
Figure 5-5 “Off” to “Semi Stand-by” flowchart (part 1)
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
Off
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
Initialise I/O pins of the st-by µP, start keyboard scanning,
RC detection, P50 decoding. Wake up reasons are off.
Stand by or
Protection
Mains is applied
- Switch Sound-Enable and Reset-Audio high.
They are low in the standby mode if the
standby mode lasted longer than 10s.
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.
Wait 50ms and then start polling the detect-
5V, detect-8V6 and detect-12V every 40ms.
Enable the DC/DC converter for +1.2V.
ac5V supply detection algorithm
Start polling the detect-1V2 every 40ms
To Part B To Part C To Part B To Part B
+5V, Vtun, +8V6, +12VSW, +5V2S, Vsound
and +12/24V are switched on
Switch Main Supply to ON by switching LOW both the
ON-MODE and the POD-MODE I/O lines.
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.
detect-5V
received within
2900 ms after POD-MODE I/O
line toggle?
Yes
Switch LOW the NVM power reset line. Add a 2ms delay before
trying to address the NVM to allow correct NVM initialization.
+12V error
detect-12V received within
2900 ms after POD-mode I/O
line toggle?
No
SP
ac12V supply
detection algorithm
Yes
detect-8V6 received
within 6300 ms after POD-mode I/O line
toggle? Startup shall not wait for this
detection and continue startup.
No
No need to wait for the 8V6 detection at this point.
Yes
Audio Protection Line
HIGH?
No
Yes
Audio Error
SP
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.
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.
PDPGO
=
High?
Switch PDPGO high:
PDP should start: 5V, 8V6 and
12V are activated
No
Yes
+5V error
detect-5V
received within
2900 ms after PDPGO
toggle?
No
SP
- 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.
yes
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.
action holder: MIPS
autonomous action
action holder: St-by
G_15990_103a.eps
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