Stepwise Start-Up; Transition Diagram - Philips 32PFL7403D/10 Service Manual

5.3

Stepwise Start-up

There are two possible situations: one for protections detected
by the stand-by software and one for protections detected by
the 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 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 faulty FET
7U08 is done, you can destroy all IC's supplied by the +3V3,
- Tact switch Pushed
- last status is hibernate
after mains ON
Hibernate
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 5-3 Transition diagram
Q528.2E LB
due to overvoltage. It is recommended to measure first the FET
7U08 on short-circuit before activating 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.
Mains
on
WakeUp
requested
Semi
St by
- St by requested
- tact SW pushed
WakeUp
requested
(SDM)
GoTo Protection
Protection
5. EN 25
Active
GoTo Protection
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