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 Software Upgrading
5.4 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. In this way it is
possible to determine which part is defective.
Perform measurements under the following conditions:
•
Video: Colour bar signal.
•
Audio: 3 kHz left, 1 kHz right.
5.2
Service Modes
The Service Mode feature is split into two parts:
•
Service Alignment Mode (SAM).
•
Customer Service Mode (CSM).
SAM offer features, which can be used by the Service engineer
to repair/align a TV set. Some features are:
•
Display information (“Service Menu” (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.
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
“TV Life Time”). It counts the normal operation minutes (not the
Stand-by minutes). The actual value of the timer is displayed in
SDM and SAM in a decimal value. Every two soft-resets
increase the hour by + 60 minutes. Stand-by minutes are not
counted.
Software Identification, Version, and Cluster
The software ID, version, and cluster will be shown in the main
menu display of SAM, and CSM.
The screen will show: “AAAAAB-XX.YY”, where:
•
AAAAA is the chassis name: VEM11E_2.1.4n.
•
B is the region indication: E = Europe, A = AP/China, U =
NAFTA, L = LATAM.
•
XX is the main version number: this is updated with a major
change of specification (incompatible with the previous
software version). Numbering will go from 01 - 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.
•
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.
5.2.2
Service Alignment Mode (SAM)
Purpose
•
Change and test video settings.
•
View options.
•
TV life time
•
SW number
•
Factory reset
•
Diagnose features
Specifications
•
Operation minutes counter (maximum five digits
displayed).
•
Software version and option settings display.
•
Option settings.
•
Software alignments (White Tone).
How to Activate SAM
To activate SAM, use one of the following methods:
•
Press Menu button first. While main menu is on screen
press 4725 consecutively. Do not allow the display to time
out between entries while keying the sequence.
After entering SAM, the following items are displayed.
Figure 5-1 Example of SAM
How to Store SAM Settings
All the changes which have been made are stored
automatically. It is suffice to enter the new value and just exit.
How to Exit SAM
Use one the following method:
•
Switch the set to STANDBY by pressing the mains button
on the remote control transmitter or the television set.
Note
: When the TV is switched “off” by a power interrupt while
in SAM, the TV will show up in “normal operation mode” as
soon as the power is supplied again. The error buffer will not be
cleared.
5.2.3
Customer Service Mode (CSM)
Purpose
The Customer Service Mode shows information about the TV’s
operation settings. The call centre can instruct the customer
(by telephone) to enter CSM in order to identify the status of the
set.This helps the call centre to diagnose problems and failures
in the TV set before making a service call.
The CSM is a read-only mode; therefore, modifications are not
possible in this mode.
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