Service Modes, Error Codes, and Fault Finding
EN 17EJ2.0U LA 5.
by the transistors connected to the PWM outputs of the
microprocessor.
In case the Ambi Light switches off after two seconds, serial
arcing or parallel arcing protection is active. Serial arcing
protection can be excluded by disconnecting the opto-coupler;
check for bad solder joints on transformer or lamp units.
Parallel arcing protection can be disabled by grounding pin 8 of
the microprocessor. Usually the switching frequency (normally
63 kHz) will then be too high. Possible causes are one
MOSFET of the converter has no gate drive or is broken, or
there is a short-circuit of the output of the transformer.
5.3 Stepwise Start-up
The stepwise start-up method, as known from FTL/FTP sets is
not valid any more. The situation for this chassis is as follows:
when the TV is in a protection state detected via the Stand-by
Processor (and thus blinking an error) and SDM is activated via
short cutting 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 11 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).
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 VIPER Main
Processor.
Figure 5-4 Transition diagram
On
Active
Semi
Stand-by
Stand-by
(Off St-by)
Off
Mains
“on”
Mains
“off”
GoToProtection
- WakeUp requested
- Acquisition needed
- No data Acquisition required
and no POD present
- St-by requested
- Tact SW pushed
WakeUp
requested
Protection
WakeUp
requested
GoToProtection
POD
*
Stand-by
No data Acquisition
required and
POD present
d
GoToProtec
Only applicable for sets with CableCARD
TM
slot (POD)
tion
- WakeUp requested
- Acquisition needed
- Tact SW pushed
- POD Card remove
- Tact SW pushed
F_15400_095.eps
020206
*
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