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Service Modes, Error Codes, and Fault Finding
EN 23Q549.2E LA 5.
2009-May-08
Figure 5-8 “Semi Stand-by” to “Active” flowchart (LED backlight)
Active
Semi Standby
action holder: AVC
autonomous action
action holder: St-by
Initialize audio and video
processing IC's and functions
according needed use case.
Assert RGB video blanking
and audio mute
Wait until previous on-state is left more than 2
seconds ago. (to prevent LCD display problems)
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,
the semi -> stby transition has to be delayed
until the requirement is met.
Switch Audio-Reset low and wait 5ms
Constraints taken into account:
- Display may only be started when valid LVDS output clock can be delivered by the AVC.
- Between 5 and 50 ms after power is supplied, display should receive valid lvds clock .
- minimum wait time to switch on the lamp after power up is 200ms.
unblank the video.
Wait until valid and stable audio and video, corresponding to
the requested output is delivered by the AVC.
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.
Release audio mute and wait 100ms before any other audio
handling is done (e.g. volume change)
CPipe already generates a valid output
clock in the semi -standby state: display
startup can start immediately when leaving
the semi-standby state.
wait 250ms (min. = 200ms)
TBC in def. spec
Switch on LCD backlight
(Lamp-ON)
Switch on the display by sending the OUTPUT-
ENABLE (I²C) command to the LED DIM panel
Switch on the Ambilight functionality according the last status
settings.
The higher level requirement is that the
ambilight functionality may not be switched on
before the backlight is turned on in case the
set contains a CE IPB inverter supply.
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