Philips 28PW9618, Service Manual

Page: 136 / 172

Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 136 EM6E 9.
9.4
Control
9.4.1
"Switch On" Behaviour
Figure 9-6 Switch "on" flow chart (part 1)
Start up sequence:
1.
After the power is applied, the "Standby supply" starts
oscillating, generating the +5V2, V_tun and +11V. A reset
(POR) is generated and the OTC is awakened.
2.
Next step is the check whether the set needs to be in
"Standby" mode or not. Therefore, the NVM content is read
and the Standby-bit is checked. If the set is to stay in
Standby, there is no further action.
3.
If the set switches "on", first the degaussing will be
activated (for 12 seconds).
4.
Meanwhile the MSP is reset, and the Standby line is pulled
low, leading to a full semi standby mode (+5V2 and +8V
switched on). Mute sound amplifiers.
5.
The OTC waits until the +5V and the +8V are fully present
(checking the AD-input of the OTC does this). The +5V,
+8V, and I2C protection-algorithms are activated.
Figure 9-7 Switch "on" flow chart (part 2)
1.
Initialise HOP, HIP, 3D Comb, PICNIC, PIP/DW, Tuner,
and MSP.
2.
Activate HFB and X-ray (USA only) protections.
3.
The HOP is instructed via the I2C-bus to start the line drive.
4.
Via the SUP-ENABLE signal, the main supply is activated.
The Line Deflection circuitry is supplied now with the
V_BAT, and the EHT generation can start. Also V_SOUND
becomes available.
5.
During start-up of the deflection, I2C traffic must be
disabled for 250 ms to avoid data corruption. If flashes or
spikes are generated during EHT start-up, I2C data could
be disturbed or corrupted.
6.
After deflection is powered up completely, all the other
protection-algorithms are activated.
7.
The black current stabilisation loop in the HOP is switched
on. Some extra checking is done to ensure that the loops
are completely stabilised.
8.
The OTC sets all the necessary parameters for a correct
sound and image and unblanks the picture.
CL 36532008_124.eps
080503
off state:
Power is applied
Standby supply starts running.
+5.2V; Vtun; +11V become present
OTC resets
Initialise I/O pins of the OTC
Initialise HDD interface
Initialise DVD interface
Read IO exp DVD
Read NVM identification and
standby bit; enable watchdog
Standby bit
set?
Activate degaussing and
deactivate after 12 seconds (of course, in the
meanwhile, other processes should continue)
start HDD
activate MSP reset
Put Standby line LOW
Keep sound amplifiers
muted with sound enable = HIGH
+5V and +8V is switched ON
+8V and +5V get their nominal
level, detected by the OTC
activate protection algorithms for +8V
and +5V and I
2
C (start I
2
C protection the
moment the component is initialised)
Read rest of NVM information
Initialise HOP; set_sync_mode = not_active
set_black_current_stabilisation = not active
set_standby_mode_HOP = ON
set_rgb_blanking = ON
Initialise HIP: IF, source selection, 2fh input, video processing
Switch on the syncoutput: set_syncout_tristate = OFF
Initialise 3D Combflter
Only in US sets (not in 2003)
Set stays in
standby mode
No
Yes
t<1500ms
t<500ms
t<250ms
Trapped Startup 2
Trapped Startup 1
A
CL 36532008_125.eps
080503
Initialise PICNIC
Initialise rest of PIP/DW module
(MUPPET already initialised)
Initialise tuner
Start TXT acquisition
Initialize TDL
Start video recogn HDD
deactivate reset MSP and
initialise MSP
detect and initialise wireless Module
(Power up sequence)
set_standby_mode_HOP = Normal
activate HFB and X-ray (US only)
protection 600ms later
HOP starts linedrive; Linedrive switches on the main
supply; Vbatt, Vsound become available
EHT generation starts; NO I
2
C during 250ms after
set_standby_mode_HOP is switched to NORMAL
ON
Start 30s timer
wait 200ms
Increase counter
(CR 433) Report
BlackCurrentLoopError
Counter = 0
Set_user_settings,
demute,
set_rgb_blanking = OFF
End of freerunning PLL;
HOP: set_sync_mode = active
set_black_current_stabilisation = one_point_control
No
No
No
Yes
Yes
Counter = 11
Time out of
30 seconds
reached
Get_black_current_failure
= FAIL
Yes
Trapped Startup 3
Trapped Startup 4
Trapped Startup 5
A