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TPE1.0U LA
5. Service Modes, Error Codes and Fault Finding
visible via the front LED. This is especially useful for fault
finding, when there is no picture.
When the blinking LED procedure is activated in the state,
the front LED will show (blink) the contents of the error-buffer.
Error-codes > 10 are shown as follows:
1. long blinks (where =1 - 9) indicating decimal digit,
2. A pause of 1.5 s,
3. short blinks (where =1 - 9),
4. A pause of approx. 3 s.
5. When all the error-codes are displayed, the sequence
finishes with a LED blink of 3 s,
6. The sequence starts again.
Example: Error 129600.
After activation of the SDM, the front LED will show:
1. 1 long blink of 750 ms (which is an indication of the decimal
digit) followed by a pause of 1.5 s,
2. 2 short blinks of 250 ms followed by a pause of 3 s,
3. 9 short blinks followed by a pause of 3 s,
4. 6 short blinks followed by a pause of 3 s,
5. 1 long blink of3stofinish the sequence,
6. The sequence starts again.
5.6.2 How to Activate
Use one of the following methods:
. The blinking front LED will show the
entire contents of the error buffer (this works in normal
operation mode).
. The complete error buffer is shown.
Take notice that it takes some seconds before the blinking
LED starts.
(where x is a number between 1 and
5). When x= 1 the last detected error is shown, x= 2 the
second last error, etc.... Take notice that it takes some
seconds before the blinking LED starts.
5.7.1 Software Protections
Most of the protections and errors use either the stand-by
microprocessor or the VIPER controller as detection device.
Since in these cases, checking of observers, polling of ADCs,
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:
: check of the 12V, +5V,
+8V6, +1.2V, +2.5V and +3.3V.
. E.g. since a lot of protection detections are
done by means of the VIPER, failing of the VIPER
communication will have to initiate a protection mode since
safety cannot be guaranteed anymore.
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.
During TV start-up, some voltages and IC observers are
actively monitored to be able to optimize 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 paragraph Stepwise Start-up ).
5.7.2 Hardware Protections
5.7 Protections
Activate the SDM
Transmit the commands MUTE - 062500 - OK
with a normal RC
Transmit the commands MUTE - 062500 - OK
with a normal RC
Protections related to supplies
Protections related to breakdown of the safety check
mechanism
Remark on the Supply Errors
Protections during Start-up
"ON"
"n" "n"
"n"
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There is one hardware protection in this chassis: Audio DC
Protection
"
".This protection occurs when there is a DC voltage
on the speakers. In that case the main supply is switched "off",
but the stand-by supply is still working.
For the Samsung V4 PDP display s, the 8V6 supply is switched "off"
and the LED on the display Main Supply blinks eleven
times, which means there is an overvoltage protection. The
front LED of the TV will blink error 7 (8V6 error).
In case of LCD supplies, the 12V supply will drop. This will be
detected by the stand-by processor, which will start blinking the
12 V error (error 12).
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Repair Tips
If there is an audio DC protection (DC voltage on your
speakers), you will probably see error 12 blink in case of
LCD TVs, and error 7 for TVs with SDI displays. To be sure
there is an audio DC protection, disconnect the cable
between the SSB and the Audio PWB and also the cable
between the Main Supply and the Audio PWB. If the TV
starts up, it is very likely that there is DC voltage on the
speakers. Check, and replace if necessary, the audio
amplifiers.
It is also possible that you have an audio DC protection
because of an interruption in one or both speakers (the DC
voltage that is still on the circuit cannot disappear through
the speakers).
Read also paragraph Error Codes - Extra Info .
5.8.1 MPIF
Important things to make the MPIF work:
Supply.
Clock signal from the AVIP.
I C from the VIPER.
5.8.2 AVIP
Important things to make the AVIP work:
Supplies.
Clock signal from the VIPER.
I C from the VIPER
5.8.3 DC/DC Converter
Introduction
The best way to find a failure in the DC/DC converters is to
check their starting-up sequence at power on via the
Mains/AC Power cord, presuming that the Stand-by
Processor is operational.
If the input voltage of the DC/DC converters is around 12 V
(measured on the decoupling capacitors 2U17/2U25)
and the ENABLE signals are low (active), then the
output voltages should have their normal values.
First, the Stand-by Processor activates the +1V2 supply
(via ENABLE-1V2).
Then, after this voltage becomes present and is detected
OK (about 100 ms), the other two voltages (+2V5 and
+3V3) will be activated (via ENABLE-3V3).
The current consumption of controller IC 7U00 is around 20
mA (that means around 200 mV drop voltage across
resistor 3U22).
The current capability of DC/DC converters is quite high
(short-circuit current is 7 to 10 A), therefore if there is a
linear integrated stabilizer that, for example delivers 1.8V
from +3V3 with its output overloaded, the +3V3 stays
usually at its normal value even though the consumption
from +3V3 increases significantly.
The +2V5 supply voltage is obtained via a linear stabilizer
made with discrete components that can deliver a lot of
current. Therefore, in case +2V5 (or +2V5D) is shortcircuited
to GND, the +3V3 will not have the normal value
5.8 Fault Finding and Repair Tips
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