“Protection” Flowchart - Philips 42PF9731D Service Manual

Service Modes, Error Codes, and Fault Finding
action holder: MIPS
action holder: St-by
autonomous action
If needed to speed up this transition,
this block could be omitted. This is
depending on the outcome of the
safety investigations.
*
Only applicable for sets with CableCARD
MP
Log the appropriate error and
set stand-by flag in NVM
Redefine wake up reasons for protection
state and transfer to stand-by µP.
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)
Ask stand-by µP to enter protection state
Switch Viper in reset state
Wait 10ms
Switch the NVM reset line "high".
Disable all supply related protections and switch "off"
the +2V5, +3V3 DC/DC converter.
Wait 5ms
Switch "off" the remaining DC/DC converters
Switch "off" all supplies by switching "high" the POD-
MODE and the ON-MODE I/O lines.
Flash LED in order to indicate
protection state.
Protection
TM
slot (POD)
Figure 5-16 "Protection" flowchart
BJ2.4U/BJ2.5U LA
SP
*
F_15400_102.eps
5. EN 31
020206