Philips 32PF9968/10 Service Manual page 23

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Service Modes, Error Codes, and Fault Finding
action holder: MIPS
action holder: St-by
autonomous action
The availability of the supplies is checked through detect
signals going to the st-by µP. These signals are available
for +12V and +5V (combined as AND function, called
detect-5V-12V) and for +1V2 and +3V3 (combined as
AND function, called detect-1V2-2V5-3V). A low to high
transition of the signals should occur within a certain time
after toggling the standby line. If an observer is detected
before the time-out elapses, of course, the process
should continue in order to minimize start up time.
Figure 5-4 "Off" to "Semi Stand-by" flowchart (part 1)
Off/Stby to Semi
Off
Mains is applied
Standby Supply starts running.
All standby supply voltages become available .
st-by µP resets
All I/O lines have a High default state:
- Switch PNX85xx in reset (active LOW).
- Keep the Audio-reset high.
- NVM power line is high, no NVM communication possible.
Initialise I/O pins of the st-by µP, start keyboard scanning, RC
detection. 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 an FHP set) which will start the
FHP PDP.
Switch ON Platform and display supply by switching LOW the
POD-MODE and the ON-MODE I/O lines.
+5V, and +12V are switched on
Wait 50ms and then start polling the detect-
5V-12V every 40ms.
detect-5V-12V received within
2900 ms after POD-mode I/O
line toggle?
Yes
activate +5V/+12V supply
detection algorithm. See CHS protections.
Enable the +1V2 supply (ENABLE-1V2)
Wait 100ms
Enable the supply for
+1.8V and +3.3V (ENABLE-3V3)
Start polling the detect-1V2-2V5-3V3
every 40ms
Detection
received within
250 ms after enable-3V3
toggle?
Yes
Activate supply detection algorithms for DC-
DC outputs
Wait 20ms
SUPPLY-FAULT I/O line
is High?
Q522.1E 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 Audio-Reset high.
It is low in the standby mode if the standby
mode lasted longer than 10s.
Display supply is switched on
through the ON-mode I/O line
No "5V 12V supply" error
SP
100 ms is recommended by the
PNX85xx spec
.
No separate enable is present
for the +1V8 supply in the
TV522.
Only one detect line is present
in the TV522: it detects +1V2
and +3V3
No 1V2 2V5 3V3 DCDC error
SP
No Supply fault error
5. EN 23
The supply fault line is an OR
function of DCDC, DCDC5050
and POD/CI supply switch.
H_17650_094a.eps
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