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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 Fault Finding and Repair Tips
5.7 Software Upgrading
5.1
Test Points
In the chassis schematics and layout overviews, the test points
are mentioned. In the schematics, test points are indicated with
"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: Color 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).
•
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
is 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 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 I2C /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 I2C 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).
Service Modes, Error Codes, and Fault Finding
LC9.3L LA
5.2.1
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.
Specifications
Table 5-1 SDM default settings
Region
Europe (except France),
AP-PAL/-Multi
France
NAFTA, AP-NTSC
LATAM
•
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 favorite", "Skipped" or
"Locked" presets/channels.
–
Automatic storing of Personal Preset or Last Status
settings.
–
Automatic user menu time-out (menu switches back/
OFF automatically.
–
Auto Volume levelling (AVL).
How to Activate SDM
For this chassis there are two kinds of SDM: an analog SDM
and a digital SDM. Tuning will happen according
•
Analog SDM: use the standard RC-transmitter and key in
the code "062596", directly followed by the "MENU" (or
HOME) button.
Note: It is possible that, together with the SDM, the main
menu will appear. To switch it "off", push the "MENU" (or
HOME) button again.
•
Digital SDM: use the standard RC-transmitter and key in
the code "062593", directly followed by the "MENU" (or
HOME) button.
Note: It is possible that, together with the SDM, the main
menu will appear. To switch it "off", push the "MENU" (or
HOME) button again.
•
Analog SDM can also be activated by grounding for a
moment the solder pad on the SSB, with the indication
"SDM" (see figure
Service mode
5.
EN 17
Freq. (MHz)
Default syst.
475.25
PAL B/G
SECAM L
61.25 (channel 3) NTSC M
PAL M
Table
5-1.
pad).
2010-Mar-26
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