Philips 26HFL5870D/10 Service Manual page 30

EN 30 5. Q522.1HE LA
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.
2009-Dec-04
Service Modes, Error Codes, and Fault Finding
All standby supply voltages become available .
action holder: MIPS
action holder: St-by
autonomous action
All I/O lines have a High default state:
- Switch PNX85xx in reset (active LOW).
- 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
Switch ON Platform and display supply by switching LOW the
POD-MODE and the ON-MODE I/O lines.
Wait 50ms and then start polling the detect-
detection algorithm. See CHS protections.
Enable the +1V2 supply (ENABLE-1V2)
+1.8V and +3.3V (ENABLE-3V3)
Start polling the detect-1V2-2V5-3V3
Activate supply detection algorithms for DC-
Figure 5-4 "Off" to "Semi Stand-by" flowchart (part 1)
Off/Stby to Semi
Off
Mains is applied
Standby Supply starts running.
st-by µP resets
- Keep the Audio-reset high.
FHP PDP.
+5V, and +12V are switched on
5V-12V every 40ms.
detect-5V-12V received within
No
2900 ms after POD-mode I/O
line toggle?
Yes
activate +5V/+12V supply
Wait 100ms
Enable the supply for
every 40ms
Detection
received within
No
250 ms after enable-3V3
toggle?
Yes
DC outputs
Wait 20ms
SUPPLY-FAULT I/O line
No
is High?
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
"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
1V2 2V5 3V3 DCDC error
SP
Supply fault error
The supply fault line is an OR
function of DCDC, DCDC5050
and POD/CI supply switch.
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