Philips 32PF9968/10 Service Manual page 22

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EN 22 5. Q523.1U LA
5.3 Stepwise Start-up
The stepwise start-up method, as known from FTL/FTP sets
(EMG based sets) is not valid any more. There are two possible
situation: one for protections detected by stand-by software
and one for protections detected by main software.
When the TV is in a protection state due to an error detected by
stand-by software (and thus blinking an error) and SDM is
activated via short-circuiting the pins on the SSB, the TV starts
up until it reaches the situation just before protection. So, this
is a kind of automatic stepwise start-up. In combination with the
start-up diagrams below, you can see which supplies are
present at a certain moment. Important to know here is, that if
e.g. the 3V3 detection fails (and thus error 8 is blinking) and the
TV is restarted via SDM, the Stand-by Processor will enable
the 3V3, but will not go to protection now. The TV will stay in
this situation until it is reset (Mains/AC Power supply
interrupted). Caution: in case the start up in this mode with a
- Tact switch Pushed
- last status is hibernate
after mains ON
Hibernate
On
In US region, hibernate state and tact switch are not available.
Here the local keyboard tact switch acts as standby button.
Service Modes, Error Codes, and Fault Finding
Mains
off
- WakeUp requested
- Acquisition needed
- No data Acquisition
St by
required
- tact SW pushed
- last status is hibernate
after mains ON
Tact switch
pushed
Figure 5-2 Transition diagram
faulty FET 7U01 is done, you can destroy all IC's supplied by
the +3V3, due to over voltage. It's recommended to measure
first the FET 7U01 on short-circuit before activate SDM via the
service pads.
When the TV is in protection state due to an error detected by
main software (Mips protection) and SDM is activated via short
cutting the service pads on the SSB, the TV starts up and
ignores the error.
In this chassis only error 63 (power-ok) is a Mips protection and
already displays the failure via blinking LED.
The abbreviations "SP" and "MP" in the figures stand for:
• SP: protection or error detected by the Stand-by
Processor.
• MP: protection or error detected by the Mips Main
Processor.
Off
Mains
on
WakeUp
requested
Semi
St by
- St by requested
- tact SW pushed
WakeUp
requested
(SDM)
GoToProtection
Active
GoToProtection
Protection
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