Service Modes, Error Codes, and Fault Finding
EN 24
EJ2.0U LA
5.
Figure 5-11 “Protection” flowchart
Switch off remaining DC/DC converters
Switch OFF all supplies by switching HIGH the POD-
MODE and the ON-MODE I/O lines.
Protection
redefine wake up reasons for protection
state and transfer to stand-by µP.
Log the appropriate error and
set stand-by flag in NVM
MP
Ask stand-by µP to enter protection state
Flash LED in order to indicate protection state*.
(*): This can be the standby LED or the ON LED
depending on the availability in the set under
discussion.
SP
switch off LCD lamp supply
Wait 250ms (min. = 200ms)
Switch off LVDS signal
Switch off 12V LCD supply within a time frame
of min. 0.5ms to max. 50ms after LVDS switch
off.
Disable all supply related protections and switch off
the +2V5, +3V3 DC/DC converter.
Switch Viper in reset state
Wait 5ms
Wait 10ms
Switch the NVM reset line HIGH.
G_15990_112.eps
120506
action holder: MIPS
autonomous action
action holder: St-by