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EN 12
5.
LC7.1E LB
5. Service Modes, Error Codes, and Fault Finding
Index of this chapter:
5.1 Test Points
5.2 Service Modes
5.3 Service Tools
5.4 Error Codes
5.5 The Blinking LED Procedure
5.6 TV Main Software Upgrading
5.7 Fault Finding and Repair Tips
5.1
Test Points
In the chassis schematics and layout overviews, the test points
(Fxxx) are mentioned. In the schematics, test points are
indicated with a rectangular box around "Fxxx" or "Ixxx", in the
layout overviews with a "half-moon" sign.
As most signals are digital, it will be difficult to measure
waveforms with a standard oscilloscope. Several key ICs are
capable of generating test patterns, which can be controlled via
ComPair. In this way it is possible to determine which part is
defective.
Perform measurements under the following conditions:
•
Service Default Mode.
•
Video: Colour bar signal.
•
Audio: 3 kHz left, 1 kHz right.
5.2
Service Modes
The Service Mode feature is split into four parts:
•
Service Default Mode (SDM).
•
Service Alignment Mode (SAM).
•
Customer Service Mode (CSM) and Digital Customer
Service Mode (DCSM).
•
Computer Aided Repair Mode (ComPair).
SDM and SAM offer features, which can be used by the Service
engineer to repair/align a TV set. Some features are:
•
A pre-defined situation to ensure measurements can be
made under uniform conditions (SDM).
•
Activates the blinking LED procedure for error identification
when no picture is available (SDM).
•
The possibility to overrule software protections when SDM
was entered via the Service pins.
•
Make alignments (e.g. white tone), (de)select options,
enter options codes, reset the error buffer (SAM).
•
Display information ("SDM" or "SAM" indication in upper
right corner of screen, error buffer, software version,
operating hours, options and option codes, sub menus).
The (D)CSM is a Service Mode that can be enabled by the
consumer. The CSM displays diagnosis information, which the
customer can forward to the dealer or call centre. In CSM
mode, "CSM", is displayed in the top right corner of the screen.
The information provided in CSM and the purpose of CSM is to:
•
Increase the home repair hit rate.
•
Decrease the number of nuisance calls.
•
Solved customers' problem without home visit.
ComPair Mode is used for communication between a computer
2
and a TV on I
C /UART level and can be used by a Service
engineer to quickly diagnose the TV set by reading out error
codes, read and write in NVMs, communicate with ICs and the
uP (PWM, registers, etc.), and by making use of a fault finding
database. It will also be possible to up and download the
software of the TV set via I
ComPair has to be connected to the TV set via the ComPair
connector, which will be accessible through the rear of the set
(without removing the rear cover).
Service Modes, Error Codes, and Fault Finding
2
C with help of ComPair. To do this,
5.2.1
General
Some items are applicable to all Service Modes or are general.
These are listed below.
Life Timer
During the life time cycle of the TV set, a timer is kept. It counts
the normal operation hours (not the Stand-by hours). The
actual value of the timer is displayed in SDM and CSM in a
decimal value. Every two soft-resets increase the hour by +1.
Software Identification, Version, and Cluster
The software ID, version, and cluster will be shown in the main
menu display of SDM, SAM, and CSM.
The screen will show: "AAAABCD X.YY", where:
•
AAAA is the chassis name: LC71 for analogue range (non-
DVB), LC72 for digital range (DVB).
•
B is the region indication: E= Europe, A= AP/China, U=
NAFTA, L= LATAM.
•
C is the display indication: L= LCD, P= Plasma.
•
D is the language/feature indication: 1= standard, H=
1080p full HD.
•
X is the main version number: this is updated with a major
change of specification (incompatible with the previous
software version). Numbering will go from 1 - 9 and A - Z.
–
If the main version number changes, the new version
number is written in the NVM.
–
If the main version number changes, the default
settings are loaded.
•
YY is the sub version number: this is updated with a minor
change (backwards compatible with the previous versions)
Numbering will go from 00 - 99.
–
If the sub version number changes, the new version
number is written in the NVM.
–
If the NVM is fresh, the software identification, version,
and cluster will be written to NVM.
Display Option Code Selection
When after an SSB or display exchange, the display option
code is not set properly, it will result in a TV with "no display".
Therefore, it is required to set this display option code after
such a repair.
To do so, press the following key sequence on a standard RC
transmitter: "062598" directly followed by MENU and "xxx",
where "xxx" is a 3 digit decimal value of the panel type: see
column "Panel Code" in table "Option Codes OP1...OP7" (ch.
8). When the value is accepted and stored in NVM, the set will
switch to Stand-by, to indicate that the process has been
completed.
During this algorithm, the NVM-content must be filtered,
because several items in the NVM are TV-related and not SSB-
related (e.g. Model and Prod. S/N). Therefore, "Model" and
"Prod. S/N" data is changed into "See Type Plate".
In case a call centre or consumer reads "See Type Plate" in
CSM mode, he needs to look to the side/bottom sticker to
identify the set, for further actions.
5.2.2
Service Default Mode (SDM)
Purpose
Set the TV in SDM mode in order to be able to:
•
Create a pre-defined setting for measurements to be
made.
•
Override software protections.
•
Start the blinking LED procedure.
•
Read the error buffer.
•
Check the life timer.
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