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Service Modes, Error Codes, and Fault Finding
EN 18 Q549.2E LA5.
2009-May-08
5.3 Stepwise Start-up
When the TV is in a protection state due to an error detected by
stand-by software (error blinking is displayed) and SDM is
activated via shortcutting 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 layer 2 = 18 is blinking
while the TV is restarted via SDM, the Stand-by Processor will
enable the 3V3, but the TV set 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, due to overvoltage (12V on 3V3-line). It
is recommended to measure first the FET 7U08 or others
FET’s on shortcircuit before activating SDM via the service
pads.
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.
Figure 5-3 Transition diagram
Active
Semi
St by
St by
Mains
on
Mains
off
GoToProtection
-WakeUp requested
-Acquisition needed
-No data Acquisition
required
-tact SW pushed
-last status is hibernate
after mains ON
- St by requested
-tact SW pushed
WakeUp
requested
Protection
WakeUp
requested
(SDM)
GoToProtection
Hibernate
-Tact switch Pushed
-last status is hibernate
after mains ON
Tact switch
pushed
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