Philips 37PF9631D/37 Service Manual page 24

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