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EN 12
5.
LC4.31E AA
5. Service Modes, Error Codes, and Fault Finding
Index of this chapter:
5.1 Test Points
5.2 Service Modes
5.3 Problems and Solving Tips Related to CSM
5.4 Service Tools
5.5 Error Codes
5.6 The Blinking LED Procedure
5.7 Fault Finding and Repair Tips
5.1
Test Points
This chassis is equipped with test points. In the schematics,
test points are indicated with a rectangle box around Fxxx or
Ixxx, in the layouts with a half-moon.
Perform measurements under the following conditions:
•
Television set in Service Default Mode.
•
Video input: Colour bar signal.
•
Audio input: 3 kHz left channel, 1 kHz right channel.
5.2
Service Modes
Service Default mode (SDM) and Service Alignment Mode
(SAM) offer several features for the service technician, while
the Customer Service Mode (CSM) is used for communication
between the call centre and the customer.
This chassis also offers the option of using ComPair, a
hardware interface between a computer and the TV chassis. It
offers the possibilities of structured troubleshooting, error code
reading, and software version read-out for all chassis.
Minimum requirements for ComPair: a Pentium processor, a
Windows OS, and a CD-ROM drive (see also paragraph
"ComPair").
5.2.1
Service Default Mode (SDM)
Purpose
•
To create a predefined setting for measurements to be
made.
•
To override software protections.
•
To start the blinking LED procedure.
•
To inspect the error buffer.
•
To check the life timer.
Specifications
•
Tuning frequency: 475.25 MHz.
•
Colour system: PAL-BG.
•
All picture settings at 50% (brightness, colour contrast,
hue).
•
Bass, treble, and balance at 50%; volume at 25%.
•
All service-unfriendly modes (if present) are disabled. The
service unfriendly modes are:
–
Timer / Sleep timer.
–
Child / parental lock.
–
Blue mute.
–
Hotel / hospital mode.
–
Auto shut off (when no "IDENT" video signal is
received for 15 minutes).
–
Skipping of non-favourite presets / channels.
–
Auto-storage of personal presets.
–
Auto user menu time-out.
–
Auto Volume Levelling (AVL).
Service Modes, Error Codes, and Fault Finding
How to Enter
To enter SDM, use one of the following methods:
•
Press the following key sequence on the remote control
transmitter: "062596" directly followed by the MENU button
(do not allow the display to time out between entries while
keying the sequence).
•
Short one of the "Service" jumpers on the TV board during
cold start and apply mains (see Figures "Service jumper").
Then press the mains button (remove the short after start-
up).
Caution: Entering SDM by shorting "Service" jumpers will
override the +8V-protection. Do this only for a short period.
When doing this, the service-technician must know exactly
what he is doing, as it could damage the television set.
•
Or via ComPair.
Figure 5-1 Service jumper (component side)
SDM
Figure 5-2 Service jumper (solder side)
After entering SDM, the following screen is visible, with SDM in
the upper right corner of the screen to indicate that the
television is in Service Default Mode.
SDM
G_16210_087.eps
200106
G_16210_088.eps
200106
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