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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 Problems and Solving Tips
5.4 ComPair
5.5 Error Codes
5.6 The Blinking LED Procedure
5.7 Protections
5.8 Repair Tips
5.1
Test Points
This chassis is equipped with test points in the service printing.
In the schematics test points are identified with a rectangle box
around Fxxx or Ixxx. On the PCB, test points are specifically
mentioned in the service manual as "half moons" with a dot in
the center.
Perform measurements under the following conditions:
•
Service Default Alignment Mode.
•
Video: color bar signal.
•
Audio: 3 kHz left, 1 kHz right.
5.2
Service Modes
Service Default Alignment Mode (SDAM) offers several
features for the service technician.
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 trouble shooting, test
pattern generation, error code reading, software version
readout, and software upgrading.
Minimum Requirements: a Pentium Processor, Windows 95/
98, and a CD-ROM drive (see also paragraph "ComPair").
Table 5-1 SW Cluster
SW
Software
Cluster
name
L3SUM1
L03UM1 x.y TDA9377
L3SUN1
L03UN1 x.y TDA9377
Abbreviations in Software name:
U = Nafta, M = Mono, N = Stereo.
5.2.1
Service Default Alignment Mode (SDAM)
Purpose
•
To change option settings.
•
To create a predefined setting to get the same
measurement results as given in this manual.
•
To display / clear the error code buffer.
•
To override SW protections.
•
To perform alignments.
•
To start the blinking LED procedure.
Specifications
Table 5-2 SDM default settings
Region
Europe, AP-PAL/Multi
NAFTA, AP-NTSC, LATAM
Service Modes, Error Codes, and Fault Finding
UOC
Special
UOC type
Diversity
Features
55K
Mono
ROM Size
55K
Stereo
ROM Size
(non DBX)
Default
Freq. (MHz)
system
475.25
PAL B/G
61.25 (ch. 3)
NTSC M
L03.2L AA
•
All picture settings at 50 % (brightness, color contrast,
hue).
•
Bass, treble and balance at 50 %; volume at 25 %.
•
All service-unfriendly modes (if present) are disabled, like:
–
(Sleep) timer,
–
Child/parental lock,
–
Blue mute,
–
Hotel/hospitality mode
–
Auto switch-off (when no "IDENT" video signal is
received for 15 minutes),
–
Skip / blank of non-favorite presets / channels,
–
Auto store of personal presets,
–
Auto user menu time-out.
•
Operation hours counter.
•
Software version.
•
Option settings.
•
Error buffer reading and erasing.
•
Software alignments.
How to enter SDAM
Use one of the following methods:
•
Use a standard customer RC-transmitter and key in the
code 062596 directly followed by the "M" (menu) button or
•
Short jumper wires 9257 and pin 4 of 7200 on the mono
carrier (see Fig. 8-1) and apply AC power. Then press the
power button (remove the short after start-up).
Caution: Entering SDAM by shortening wires 9257 and pin
4 of 7200 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 lead to
damaging the set.
•
Or via ComPair.
After entering SDAM, the following screen is visible, with S at
the upper right side for recognition.
A A A B C D
X . Y
E R R
X X
X X
X X
X X
X X X
X X X
X X X
X X X
C
E A R
O P T I O N S
A K B
T U N E R
W H I T E
T O N E
G E O M E T R Y
A U D I O
Figure 5-1 SDAM menu
•
LLLL. This is the operation hours counter. It counts the
normal operation hours, not the standby hours.
•
AAABCD-X.Y. This is the software identification of the
main micro controller:
–
A = the project name (L03).
–
B = the region: E= Europe, A= Asia Pacific, U= NAFTA,
L= LATAM.
–
C = the feature of software diversity: N = stereo non-
DBX, S = stereo dBx, M = mono, D = DVD
–
D = the language cluster number:
–
X = the main software version number.
–
Y = the sub software version number.
•
S. Indication of the actual mode. S= SDAM= Service
Default Alignment mode.
•
Error buffers. Five errors possible.
•
Option bytes. Seven codes possible.
5.
EN 7
S
X X
X X X
X X X
X X X
C
E A R
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