Sharp LC-32LE631E Service Manual page 57

Service Modes, Error Codes, and Fault Finding (continued)
• Error 31 (Lnb controller). When there is no I
communication towards this device, LAYER 2 error = 31
will be logged and displayed via the blinking LED
procedure if SDM is activated.
• Error 34 (Tuner). When there is no I
towards the tuner during start-up, LAYER 2 error = 34 will
be logged and displayed via the blinking LED procedure
when SDM is switched on.
• Error 35 (main NVM). When there is no I
communication towards the main NVM during start-up,
LAYER 2 error = 35 will be displayed via the blinking LED
procedure when SDM is switched "on". All service modes
(CSM, SAM and SDM) are accessible during this failure,
observed in the Uart logging as follows: "<< ERRO >>>
PFPOW_.C: First Error (id19, Layer_1= 2 Layer_= 35)".
• Error 36 (Tuner DVB-S). When there is no I
communication towards the DVB-S tuner during start-up,
LAYER 2 error = 36 will be logged and displayed via the
blinking LED procedure when SDM is switched "on".
• Error 42 (Temp sensor). Only applicable for TV sets
equipped with temperature devices.
• Error 53. This error will indicate that the PNX8550 has
read his bootscript (when this would have failed, error 15
would blink) but initialization was never completed because
of hardware problems (NAND flash, ...) or software
initialization problems. Possible cause could be that there
is no valid software loaded (try to upgrade to the latest main
software version). Note that it can take a few minutes
before the TV starts blinking LAYER 1 error = 2 or in SDM,
LAYER 2 error = 53.
• Error 64. Only applicable for TV sets with an I
screen.
5.6 The Blinking LED Procedure
5.6.1 Introduction
The blinking LED procedure can be split up into two situations:
• Blinking LED procedure LAYER 1 error. In this case the
error is automatically blinked when the TV is put in CSM.
This will be only one digit error, namely the one that is
referring to the defective board (see table
overview") which causes the failure of the TV. This
approach will especially be used for home repair and call
centres. The aim here is to have service diagnosis from a
distance.
• Blinking LED procedure LAYER 2 error. Via this
procedure, the contents of the error buffer can be made
visible via the front LED. In this case the error contains
2 digits (see table "5-2 Error code
displayed when SDM (hardware pins) is activated. This is
especially useful for fault finding and gives more details
regarding the failure of the defective board.
Important remark:
For an empty error buffer, the LED should not blink at all in
CSM or SDM. No spacer will be displayed.
When one of the blinking LED procedures is activated, the front
LED will show (blink) the contents of the error buffer. Error
codes greater then 10 are shown as follows:
1. "n" long blinks (where "n" = 1 to 9) indicating decimal digit
2. A pause of 1.5 s
3. "n" short blinks (where "n"= 1 to 9)
4. A pause of approximately 3 s,
5. When all the error codes are displayed, the sequence
finishes with a LED blink of 3 s (spacer).
6. The sequence starts again.
Example: Error 12 8 6 0 0.
After activation of the SDM, the front LED will show:
1. One long blink of 750 ms (which is an indication of the
decimal digit) followed by a pause of 1.5 s
2. Two short blinks of 250 ms followed by a pause of 3 s
3. Eight short blinks followed by a pause of 3 s
2
C
2
C communication
5.6.2
2
C
2
C
5.7
5.7.1
2
C controlled
"5-2 Error code
overview") and will be
5.7.2
57
4. Six short blinks followed by a pause of 3 s
5. One long blink of 3 s to finish the sequence (spacer).
6. The sequence starts again.
How to Activate
Use one of the following methods:
• Activate the CSM. The blinking front LED will show only
the latest layer 1 error, this works in "normal operation"
mode or automatically when the error/protection is
monitored by the Stand-by processor.
In case no picture is shown and there is no LED blinking,
read the logging to detect whether "error devices" are
mentioned. (see section "5.8 Fault Finding and Repair
Tips, 5.8.7 Logging").
• Activate the SDM. The blinking front LED will show the
entire content of the LAYER 2 error buffer, this works in
"normal operation" mode or when SDM (via hardware pins)
is activated when the tv set is in protection.
Protections
Software Protections
Most of the protections and errors use either the stand-by
microprocessor or the MIPS controller as detection device.
Since in these cases, checking of observers, polling of ADCs,
and filtering of input values are all heavily software based,
these protections are referred to as software protections.
There are several types of software related protections, solving
a variety of fault conditions:
• Related to supplies: presence of the +5V, +3V3 and 1V2
needs to be measured, no protection triggered here.
• Protections related to breakdown of the safety check
mechanism. E.g. since the protection detections are done
by means of software, failing of the software will have to
initiate a protection mode since safety cannot be
guaranteed any more.
Remark on the Supply Errors
The detection of a supply dip or supply loss during the normal
playing of the set does not lead to a protection, but to a cold
reboot of the set. If the supply is still missing after the reboot,
the TV will go to protection.
Protections during Start-up
During TV start-up, some voltages and IC observers are
actively monitored to be able to optimise the start-up speed,
and to assure good operation of all components. If these
monitors do not respond in a defined way, this indicates a
malfunction of the system and leads to a protection. As the
observers are only used during start-up, they are described in
the start-up flow in detail (see section
Hardware Protections
The only real hardware protection in this chassis appears in
case of an audio problem e.g. DC voltage on the speakers. This
protection will only affect the Class D audio amplifier (item
7D10; see diagram B03A) and puts the amplifier in a
continuous burst mode (cyclus approximately 2 seconds).
Repair Tip
• There still will be a picture available but no sound. While
the Class D amplifier tries to start-up again, the cone of the
loudspeakers will move slowly in one or the other direction
until the initial failure shuts the amplifier down, this cyclus
starts over and over again. The headphone amplifier will
also behaves similar.
LC-32LE631
LC-40LE631
LC-46LE631
"5.3 Stepwise Start-up").