Sharp LC-46LE631E (serv.man2) Service Manual ▷ View online
49
LC-32LE631
LC-40LE631
LC-46LE631
LC-40LE631
LC-46LE631
Figure 5-4 “Off” to “Semi Stand-by” flowchart (part 1)
18770_251_100216.eps
100216
No
EJTAG probe
connected ?
No
Yes
Release AVC system reset
Feed warm boot script
Cold boot?
Yes
No
Set I²C slave address
of Standby μP to (A0h)
An EJTAG probe (e.g. WindPower ICE probe) can be
connected for Linux Kernel debugging purposes.
connected for Linux Kernel debugging purposes.
Detect EJTAG debug probe
(pulling pin of the probe interface to
ground by inserting EJTAG probe)
Release AVC system reset
Feed cold boot script
Release AVC system reset
Feed initializing boot script
disable alive mechanism
Off
Standby Supply starts running.
All standby supply voltages become available.
st-by μP resets
Stand by or
Protection
Mains is applied
- Switch Audio-Reset high.
It is low in the standby mode if the standby
mode lasted longer than 10s.
start keyboard scanning, RC detection. Wake up reasons are
off.
If the protection state was left by short circuiting the
SDM pins, detection of a protection condition during
startup will stall the startup. Protection conditions in a
playing set will be ignored. The protection mode will
not be entered.
Detect2 is moved to an interrupt. To be checked if
the detection on interrupt base is feasible or not or if
we should stick to the standard 40ms interval.
the detection on interrupt base is feasible or not or if
we should stick to the standard 40ms interval.
+12V, +24Vs, AL and Bolt-on power
is switched on, followed by the +1V2 DCDC converter
Enable the supply detection algorithm
Switch ON Platform and display supply by switching
LOW the Standby line.
Initialise I/O pins of the st-by μP:
- Switch reset-AVC LOW (reset state)
- Switch reset-system LOW (reset state)
- Switch reset-Ethernet LOW (reset state)
- Switch reset-USB LOW (reset state)
- Switch reset-DVBs LOW (reset state)
- keep Audio-reset and Audio-Mute-Up HIGH
- Switch reset-system LOW (reset state)
- Switch reset-Ethernet LOW (reset state)
- Switch reset-USB LOW (reset state)
- Switch reset-DVBs LOW (reset state)
- keep Audio-reset and Audio-Mute-Up HIGH
Enable the DCDC converters
(ENABLE-3V3n LOW)
No
Detect2 high received
within 2 seconds?
12V error:
Layer1: 3
Layer2: 16
Enter protection
Yes
Wait 50ms
Service Modes, Error Codes, and Fault Finding (continued)
50
LC-32LE631
LC-40LE631
LC-46LE631
LC-40LE631
LC-46LE631
Figure 5-5 “Off” to “Semi Stand-by” flowchart (part 2)
18770_252_100216.eps
100216
Yes
MIPS reads the wake up reason
from standby μP.
Semi-Standby
initialize tuner and channel decoders
Initialize video processing IC’s
Initialize source selection
initialize AutoTV by triggering CHS AutoTV Init interface
3-th try?
No
Blink Code as
error code
Bootscript ready
in 1250 ms?
Yes
No
Enable Alive check mechanism
Wait until AVC starts to
communicate
SW initialization
succeeded
within 20s?
No
Switch Standby I/O line high
and wait 4 seconds
RPC start (comm. protocol)
Set I²C slave address
of Standby μP to (60h)
Yes
Disable all supply related protections and
switch off the +3V3 +5V DC/DC converter.
switch off the remaining DC/DC
converters
Wait 5ms
Switch AVC PNX85500 in
reset (active low)
Wait 10ms
Flash to Ram
image transfer succeeded
within 30s?
No
Yes
Code =
Layer1: 2
Layer2: 53
Code =
Layer1: 2
Layer2: 15
Initialize Ambilight with Lights off.
Timing need to be updated if
more mature info is available.
more mature info is available.
Timing needs to
be updated if more
mature info is
available.
be updated if more
mature info is
available.
Timing needs to be
updated if more
mature info is
available.
updated if more
mature info is
available.
Initialize audio
Enter protection
Reset-system is switched HIGH by the
AVC at the end of the bootscript
AVC releases Reset-Ethernet, Reset-USB and
Reset-DVBs when the end of the AVC boot-
script is detected
This cannot be done through the bootscript,
the I/O is on the standby μP
the I/O is on the standby μP
Reset-Audio and Audio-Mute-Up are
switched by MIPS code later on in the
startup process
Reset-system is switched HIGH by the
AVC at the end of the bootscript
Reset-Audio and Audio-Mute-Up are
switched by MIPS code later on in the
startup process
Wake up reason
coldboot & not semi-
standby?
85500 sends out startup screen
Startup screen cfg file
present?
85500 starts up the display.
Startup screen visible
yes
yes
To keep this flowchart readable, the exact
display turn on description is not copied
here. Please see the Semi-standby to On
description for the detailed display startup
display turn on description is not copied
here. Please see the Semi-standby to On
description for the detailed display startup
sequence.
During the complete display time of the
Startup screen, the preheat condition of
Startup screen, the preheat condition of
100% PWM is valid.
No
No
Startup screen shall only be visible when there is a coldboot to
an active state end situation. The startup screen shall not be
visible when waking up for reboot reasons or waking up to semi-
standby conditions or waking up to enter Hibernate mode..
an active state end situation. The startup screen shall not be
visible when waking up for reboot reasons or waking up to semi-
standby conditions or waking up to enter Hibernate mode..
The first time after the option turn on of the startup screen or
when the set is virgin, the cfg file is not present and hence
the startup screen will not be shown.
when the set is virgin, the cfg file is not present and hence
the startup screen will not be shown.
AVC releases Reset-Ethernet, Reset-USB and
Reset-DVBs when the end of the AVC boot-
script is detected
200Hz set?
No
yes
85500 sends out startup screen
200Hz Tcon has started up the
display.
Startup screen visible
85500 requests Lamp on
Service Modes, Error Codes, and Fault Finding (continued)
51
LC-32LE631
LC-40LE631
LC-46LE631
LC-40LE631
LC-46LE631
Figure 5-6 “Semi Stand-by” to “Active” flowchart (EEFL or LED backlight 50/100 Hz only)
18770_253_100216.eps
100216
Active
Semi Standby
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. A
transition ON->SEMI->STBY->SEMI->ON cannot be
made in less than 2s, because the standby state will
be maintained for at least 4s.
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.
- To have a reliable operation of the EEFL backlight, the backlight should be driven with a maximum PWM duty
cycle during the first seconds. Only after this first one or two seconds, the PWM may be set to the required output
level (Note that the PWM output should be present before the backlight is switched on). To minimize the artefacts,
the picture should only be unblanked after these first seconds.
- To have a reliable operation of the EEFL backlight, the backlight should be driven with a maximum PWM duty
cycle during the first seconds. Only after this first one or two seconds, the PWM may be set to the required output
level (Note that the PWM output should be present before the backlight is switched on). To minimize the artefacts,
the picture should only be unblanked after these first seconds.
Restore dimming backlight feature, PWM and BOOST output
and unblank the video.
Wait until valid and stable audio and video, corresponding to the
requested output is delivered by the AVC
AND
the backlight has been switched on for at least the time which is
indicated in the display file as preheat time.
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.
Switch on LCD backlight (Lamp-ON)
Switch off the dimming backlight feature, set
the BOOST control to nominal and make sure
PWM output is set to maximum allowed PWM
PWM output is set to maximum allowed PWM
Switch on the Ambilight functionality according the last status
settings.
Delay Lamp-on with the sum of the LVDS delay and
the Lamp delay indicated in the display file
Switch on the display power by
switching LCD-PWR-ON low
Wait x ms
Switch on LVDS output in the 85500
No
The exact timings to
switch on the
display (LVDS
delay, lamp delay)
are defined in the
display file.
Start POK line
detection algorithm
return
Display already on?
(splash screen)
Yes
Display cfg file present
and up to date, according
correct display option?
Startup screen Option
and Installation setting
and Installation setting
Photoscreen ON?
Yes
No
Prepare Start screen Display config
file and copy to Flash
No
Yes
A LED set does not normally need a
preheat time. The preheat remains present
but is set to zero in the display file.
Service Modes, Error Codes, and Fault Finding (continued)
52
LC-32LE631
LC-40LE631
LC-46LE631
LC-40LE631
LC-46LE631
Figure 5-7 “Semi Stand-by” to “Active” flowchart (LED backlight 200 Hz)
18770_254_100216.eps
100216
Active
Semi Standby
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,
we have to delay the semi -> stby transition until
the requirement is met.
Switch Audio-Reset low and wait 5ms
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)
Request Tcon to Switch on the backlight in a
direct LED or
set Lamp-on I/O line in case of a side LED
Switch on the Ambilight functionality according the last status
settings.
There is no need to define the
display timings since the timing
implementation is part of the Tcon.
Start POK line
detection algorithm
return
Display cfg file present
and up to date, according
correct display option?
Startup screen Option
and Installation setting
and Installation setting
Photoscreen ON?
Yes
No
Prepare Start screen Display config
file and copy to Flash
No
Yes
Backlight already on?
(splash screen)
No
Yes
Service Modes, Error Codes, and Fault Finding (continued)
Click on the first or last page to see other LC-46LE631E (serv.man2) service manuals if exist.