Service Modes, Error Codes, and Fault Finding
EN 25
BP2.2U, BP2.3U
5.
Figure 5-11 “Protection” flowchart
Protection
action holder: MIPS
autonomous action
action holder: St-by
MP
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
If needed to speed up this transition,
this block could be omitted. This is
depending on the outcome of the
safety investigations.
Disable all supply related protections and switch “off”
the +2V5, +3V3 DC/DC converter.
Switch
“off”
all supplies by switching “high” the POD-
MODE and the ON-MODE I/O lines.
Switch Viper in reset state
Switch
“off”
the remaining DC/DC converters
Wait 5ms
Wait 10ms
Switch the NVM reset line “high”.
F_15400_102.eps
120505
Redefine wake up reasons for protection
state and transfer to stand-by µP.
Log the appropriate error and
set stand-by flag in NVM
Ask stand-by µP to enter protectio n state
Switch “off” LCD lamp supply (for LCD sets)
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”. (for LCD sets)