Philips 8000 Series Service Manual page 24

EN 24 5. Q551.1E LA
The assumption here is that a fast toggle (<2s)
can only happen during ON->SEMI ->ON. In
these states, the AVC is still active and can
provide the 2s delay. If the transition ON->SEMI-
>STBY->SEMI->ON can be made in less than 2s,
we have to delay the semi -> stby transition until
There is no need to define the
display timings since the timing
implementation is part of the Tcon.
The higher level requirement is that audio and
video should be demuted without transient
effects and that the audio should be demuted
maximum 1s before or at the same time as the
unblanking of the video.
2010-Jun-25
Service Modes, Error Codes, and Fault Finding
the requirement is met.
Backlight already on?
Request Tcon to Switch on the backlight in a
set Lamp-on I/O line in case of a side LED
Start POK line
detection algorithm
return
Figure 5-7 "Semi Stand-by" to "Active" flowchart (LED backlight 200 Hz)
Semi Standby
Wait until previous on-state is left more than 2
seconds ago. (to prevent LCD display problems)
Assert RGB video blanking
and audio mute
(splash screen)
No
direct LED or
Wait until valid and stable audio and video, corresponding to
the requested output is delivered by the AVC.
Switch Audio-Reset low and wait 5ms
Release audio mute and wait 100ms before any other audio
handling is done (e.g. volume change)
unblank the video.
Switch on the Ambilight functionality according the last status
settings.
Startup screen Option
and Installation setting
Photoscreen ON?
Display cfg file present
and up to date, according
correct display option?
Yes
Prepare Start screen Display config
file and copy to Flash
Active
back to
div. table
Yes
Initialize audio and video
processing IC's and functions
according needed use case.
Yes
No
No
18770_254_100216.eps
100216