Service Modes and Fault Finding
5.
5.
Service Modes and Fault Finding
Index of this chapter:
5.1 Test Points
5.2 Service Modes
5.3 Stepwise Start-up
5.4 Service Tools
5.5 Software Upgrading
5.6 The Blinking LED Procedure
5.7 Fault Finding and Repair Tips
5.1
Test Points
As most signals are digital, it will be difficult to measure
waveforms with a standard oscilloscope. However, 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 five parts:
•
Service Default Mode (SDM).
•
Service Alignment Mode (SAM).
•
Factory Mode.
•
Customer Service Mode (CSM).
•
Computer Aided Repair Mode (ComPair).
SDM, SAM and the Factory mode 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).
•
Make alignments (e.g. White Tone), reset the error buffer
(SAM and Factory Mode).
•
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 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
and a TV on I
2
C /UART level and can be used by a Service
engineer to quickly diagnose the TV set by reading and write in
NVMs, communicate with ICs and the micro processor (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
2
C with help of ComPair. To do this, 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).
Note: For the new model range, a new remote control (RC) is
used with some renamed buttons. This has an impact on the
activation of the Service modes. For instance the old “MENU”
button is now called “HOME” (or is indicated by a “house” icon).
5.2.1
General
Next items are applicable to all Service Modes or are general.
Life Timer
During the life time cycle of the TV set, a timer is kept (called
“Op. Hour”). It counts the normal operation hours (not the
Stand-by hours). The actual value of the timer is displayed in
SDM and SAM in a decimal value. Every two soft-resets
increase the hour by + 1. Stand-by hours are not counted.
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: “AAAAB-X.YYY”, where:
•
AAAA is the chassis name: TPN152E x.yy.
•
B is the region indication: E = Europe, A = AP/China, U =
NAFTA, L = LATAM.
•
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 - 99 and
AA - ZZ.
- 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.
•
YYY is the sub version number: this is updated with a minor
change (backwards compatible with the previous
versions). Numbering will go from 000 - 999.
- If the sub version number changes, the new version
number is written in the NVM.
- If the NVM is refreshed, the software identification,
version, and cluster will also 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 “Display Code” in
. 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.
5.2.2
Service Default Mode (SDM)
Purpose
Set the TV in SDM mode in order to be able to create a
predefined setting for measurements to be made. In this
platform, a simplified SDM is introduced (without protection
override and without tuning to a predefined frequency).
Specifications
•
Set linear video and audio settings to 50%, but volume to
25%. Stored user settings are not affected.
•
All service-unfriendly modes (if present) are disabled, since
they interfere with diagnosing/repairing a set. These
service unfriendly modes are:
–
(Sleep) timer.
–
Blue mute/Wall paper.
–
Auto switch “off” (when there is no “ident” signal).
–
Hotel or hospital mode.
–
Child lock or parental lock (manual or via V-chip).
–
Skipping, blanking of “Not favourite”, “Skipped” or
“Locked” presets/channels.
–
Automatic storing of Personal Preset or Last Status
settings.
