Service Modes, Error Codes, and Fault Finding
EN 26 Q528.2E LB5.
Figure 5-4 “Off” to “Semi Stand-by” flowchart (part 1)
All I/O lines have a High default state:
- Switch PNX8541 in reset (active LOW).
- Keep the Audio-reset high.
- NVM power line is high, no NVM communication possible.
Off
Standby Supply starts running.
All standby supply voltages become available.
st-by µP resets
No
Stand by or
Protection
Mains is applied
- Switch Audio-Reset high.
It is low in the standby mode if the standby
mode lasted longer than 10s.
Switch ON PSU supply by switching LOW the Standby I/O
line.
Initialise I/O pins of the st-by µP, start keyboard scanning, RC
detection. Wake up reasons are off.
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.
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.
Set I²C slave address
of Standby µP to (A0h)
Switch LOW the RESET-NVM_WP-NANDFLASH line. Add a 2ms delay
before trying to address the NVM to allow correct NVM initialization.
This will allow access to NVM and
NAND FLASH and can not be done
earlier because the FLASH needs to
be in Write Protect as long as the
supplies are not available.
No
Yes
12V supply” error 6DETECT 2 received within
2900 ms
No
SP
Yes
DETECT 1 = High
within
250 ms after enable-3V3 toggle?
+12V is switched on
Enable the supply fault detection
algorithm
No
Yes
SP
SUPPLY-FAULT I/O line
is High?
Wait 50ms and then start polling the DETECT 2
every 40ms.
activate DETECT 2 algorithm
Enable the +1V2 supply (ENABLE-1V2)
Wait 100ms
Enable the supply for
+3V3 and +5V (ENABLE-3V3)
Start polling the detect 1
every 40ms
Activate DETECT 1 algorithms
Wait 20ms
Supply fault error 9
Voltage output error: 8Supply Fault = High? Yes
Standby line set to HIGH for 5
seconds
No
Detect 1 = High?
Standby line set to HIGH for 5
seconds
No
Yes
SP
Enable-1V2 is reserved , not use in
TV522-82M
Restart
I_17960_062a.eps
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