Philips Q528.1E Service Manual page 26

EN 26 5. Q528.1E LA
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.
Service Modes, Error Codes, and Fault Finding
Setting the display related timings of the DFI is not needed: The
display related timings are hardcoded in the DFI
Rewrite Pacific register 0x03 (output format) with TcuUpdate: this
command is sometimes not processed properly by the Pacific at
initialisation time , resending it here solves the issue.
Switch on the display panel and the lvds via
the OutputEnable DFI command
wait 250ms (min. = 200ms)
Switch off the dimming backlight feature and
make sure PWM output is set to 100%
Switch on LCD backlight
Wait until valid and stable audio and video , corresponding to
Release audio mute and wait 100ms before any other audio
Restore dimming backlight feature, PWM output and unblank
Figure 5-8 "Semi Stand-by" to "Active" flowchart DFI
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
the requested output is delivered by the AVC AND the
backlight PWM has been on for 1second.
Switch Audio-Reset low and wait 5ms
handling is done (e.g. volume change)
the video.
Active
action holder: AVC
action holder: St-by
autonomous action
Initialize audio and video
processing IC's and functions
according needed use case.
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