Philips BJ2.4U Service Manual page 20

EN 20 5. BJ2.4U/BJ2.5U PA
Switching the PDPGO "high"
will give a visual artefact and
should only be done if really
necessary.
To part B
*
Only applicable for sets with CableCARD
Service Modes, Error Codes, and Fault Finding
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".
In case of FHP PDP: Switch PDPGO "low"
CPUGO (inverse of the stby I/O line POD-MODE) and PDPGO
are then both "low" and the PDP is in the "low power" mode.
ECO Baby Jaguar??
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
toggle?
Yes
activate +5V supply detection algorithm
detect-12VSW received within
2900 ms after POD-mode
toggle?
Yes
activate +12VSW supply
detection algorithm
No need to wait for the 8V6 detection at this point.
Enable the +1V2 supply (ENABLE-1V2)
Start polling the detect-1V2 every 40ms
To part B
TM
slot (POD)
Figure 5-6 "Off" to "Semi Stand-by" flowchart (part 1)
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 2s.
*
Auto Protection
Yes Yes
Line High??
*
Switching the POD-MODE
low in an FHP PDP set
makes the CPUGO go "high"
and starts the PDP CPU.
except in an FHP PDP Cold
Boot
*
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.
No FHP PDP Set?
Yes
Switch PDPGO high:
PDP should start: 5V, 8V6 and
12V are activated
detect-5V
received within
No
Yes
2900 ms after PDPGO
toggle?
No +12V error
SP
detect-8V6 received
within 6300 ms after POD-mode toggle?
Startup shall not wait for this detection
and continue startup.
No
+8V6 error
SP
action holder: MIPS
action holder: St-by
autonomous action
Audio Error
SP
*
Switching the POD-MODE and the
"on" mode "low" in an SDI PDP set
makes the PDP supplies go to the
"on" mode. Within 4 seconds, a
valid LVDS must be sent to the
display to prevent protection.
(valid for V3 version)
No
+5V error
SP
*
Yes
activate +8V6 supply
detection algorithm
return
F_15400_096a.eps
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