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5. Service Modes, Error Codes, and Fault Finding
Index of this chapter:
5.1 Test conditions
5.2 Service Modes
5.3 Problems and Problem Solving Tips
5.4 ComPair
5.5 Error Buffer
5.6 The 'Blinking LED' Procedure
5.7 Protections
5.8 General tips and repair tips
5.1
Test conditions
Perform measurements under the following conditions:
•
Service mode: SDM (Service Default Mode).
•
Video: color bar signal.
•
Audio: 1kHz, mono.
5.2
Service Modes
The Service Default Mode (SDM) and Service Alignment Mode
(SAM) offer several features for the service technician, while
the Customer Service Menu (CSM) is used for communication
between the servicer and the customer.
There is also the option of using ComPair, a hardware interface
between a computer (see requirements below) and the TV
chassis. It offers the ability of structured troubleshooting, error
code reading, and software version readout for this chassis.
Minimum requirements: a 486 processor, Windows 3.1 and a
CD-ROM drive (see 'ComPair' section).
5.2.1
Service Default Mode (SDM)
Purpose
•
Provide a situation with predefined settings in order to
retrieve the same measurement results as published in this
manual.
•
Start the "blinking LED" sequence procedure.
•
Have the possibility to override the 5V protection.
Specifications
•
Tuning frequency: 475.25 MHz for PAL.
•
Colour system: PAL B/G.
•
All picture settings at 50% (brightness, color, picture).
•
All sound settings at 50% except volume at 25% (bass,
treble, and balance at 50%, volume at 25%).
•
All service-unfriendly modes (if present) are disabled, such
as:
–
(sleep) timer,
–
child/parental lock,
–
blue mute,
–
hotel/hospitality mode,
–
auto switch-off (when no video signal is received for 15
minutes),
–
skip/blank of non-favorite presets/channels,
–
auto store of personal presets,
–
auto user menu time-out.
How to enter SDM
Use one of the following methods:
•
Press the following key sequence on the remote control
transmitter:
•
0-6-2-5-9-6-MENU Do not allow the display to time out
between entries while keying the sequence.
Note: It is possible that the main menu will appear when
entering SDM. To switch it off, push the 'MENU' button
again.
•
Via ComPair (simulating the DST).
Service Modes, Error Codes, and Fault Finding
EM1.1A AA
•
Via short-circuiting the solder pads on the SSB (next to
connector 1304). Disconnect the set from the mains, short
circuit pads, then reconnect the set to the mains.
Caution: Entering SDM by short-circuiting the solder pads on
the SSB will override the 5V protection. This should only be
done for a short period. In case of SW protections (errors 1,2,4
and 8), the set will shut down in 15 seconds.
When doing this, the service technician must know what
he is doing, as it could lead to damaging the set.
After entering SDM, 'SDM' will appear at the upper right corner
of the screen for recognition.
How to navigate in SDM
When you press the 'MENU' button on the remote control
transmitter, the set toggles between the SDM and the normal
user menus (with the SDM mode still active in the background).
When you press the 'STATUS/EXIT' button on the remote
control transmitter, the set shows/hides the error buffer. To
prevent interference with oscilloscope measurements, it is
possible to hide the OSD.
How to exit SDM
Switch the set to STANDBY by pressing the 'POWER' button
on the remote control transmitter or press the 'POWER' switch
on the set.
5.2.2
Service Alignment Mode (SAM)
Purpose
•
To perform alignments.
•
To change option settings.
•
To display/clear the error code buffer.
Specifications
•
Software alignments.
•
Option settings.
•
Error buffer reading and erasing. The most recent error
code is displayed on the left side.
•
Hours counter (in hexadecimal format)
•
Software version.
How to enter SAM
Use one of the following methods:
•
Press the following key sequence on the remote control
transmitter:
•
0-6-2-5-9-6-STATUS/EXIT Do not allow the display to time
out between entries while keying the sequence.
•
Via ComPair (simulating the dealer remote).
•
By using the 'ALIGN' button on the dealer remote while the
set is in normal operation mode.
•
Via short-circuiting the solder pads on the SSB (next to
connector 1304). Disconnect the set from the mains, short
circuit pads, then reconnect the set to the mains. The set
will startup in SDM, press 0-6-2-5-9-6-STATUS/EXIT to
switch to SAM.
After entering SAM, 'SAM' will appear at the upper right corner
of the screen for recognition.
Explanation of SAM menu
The Service Alignment Mode menu will now appear on the
screen. The following information is displayed:
1. 'Operation hours' timer (hexadecimal)
2. Software identification of the main microprocessor
(AAABBC-X.Y, example: EM12U1-1.0)
•
AAA is the chassis name.
5.
EN 11
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