Philips 37PF9631D/37 Service Manual page 21

Service Modes, Error Codes, and Fault Finding
Constraints taken into account:
- Display may only be started when valid QVCP output clock can be delivered by the Viper.
- Between 0 and 20 ms after power is supplied, display should receive valid lvds clock.
- minimum wait time to switch on the lamp after power up is 200ms.
- RGB (on QVCP output) may be unblanked before valid output is available. Unblanking of the
picture happens with the use of the 'lamp on', not with the RGB. By doing so, black level
differences during startup are avoided.
The assumption here is that a fast toggle
(<1s) can only happen during ON->SEMI
->ON. In these states, the Viper is still
active and can provide the 1s delay. If
the transition ON->SEMI->STBY->SEMI-
>ON can be made in less than 1s, we
have to delay the semi -> stby transition
until the requirement is met.
37" 1366*768 LCD SHARP
Semi Standby
Wait until previous on-state is left more than 1
second ago. (to prevent LCD display problems)
Assert RGB video blanking
and audio mute
Initialize audio and video processing IC's and
functions according needed use case.
Wait until QVCP generates a valid lvds output
Switch off RGB blanking
Switch on LCD supply
(LCD-Power-on)
Start to apply valid interface signals to the module (LVDS) within a time
frame of min. 17.5ms to max. 37.5ms after supply switch on.
In implementation, use 25ms, this makes it compatible with 37HD"Sharp
(t=17.5ms is the supply switch-on delay taken into account)
wait 250ms (min. = 200ms)
(lamp ready delay)
Switch on LCD lamp after valid, stable video, corresponding
to the requested output is delivered by the Viper
Switch Audio-Reset and sound enable low and demute
(see CHS audio LdspMute interface).
Active
Figure 5-8 "Semi Stand-by" to "Active" flowchart
EJ2.0U LA
clock.
This unblank is moved forwards on demand
of SW to allow to obtain valid QVCP output
5. EN 21
action holder: MIPS
action holder: St-by
autonomous action
G_15940_045.eps
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