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EN 26
5.
5. Service Modes, Error Codes, and Fault Finding
Index of this chapter:
1. Test Points
2. Service Modes
3. Problems and Solving Tips (related to CSM)
4. ComPair
5. Error Codes
6. The Blinking LED Procedure
7. Protections
8. Fault Finding and 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. These test points are specifically
mentioned in the "Test Point Overview" as "half moons" with a
dot in the center.
Table 5-1 Test point overview
Test point
F508, F535, F536, F537, F552, F561, F563, F573, F664,
I513, I518, I519, I524, I531, I533, I546
F401, F412, F413, F414, F418, F452, F453, F455, F456,
F458, F459, F460, F461, I408, I416, I417, I420, I462,
I468
F003, F004, I001, I002
F201, F203, F205, F206
F240, F241, F242
F952, F955, I951, I952
F692
F331, F332, F333, F338, F339, F341, F351, F353, F354 CRT Panel
F361, F362, F381, F382
Perform measurements under the following conditions:
•
Television set in Service Default Alignment Mode.
•
Video input: Color 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) offers several features for the service technician, while
the Customer Service Mode (CSM) is used for communication
between the call center 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 abilities of structured troubleshooting, error code
reading, and software version readout for all chassis.
Minimum requirements for ComPair: a Pentium processor, a
Windows OS, and a CD-ROM drive (see also paragraph
"ComPair").
Table 5-2 Software cluster overview
SW Cluster
SW name
UOC Type
TDA12040H1/N1B501AO
L4LLS1
L4LLS1_x.y
TDA12040H1/N1B511AP
L4= Chassis name, L= Large Screen, L= LATAM, S= Stereo dBx, 1= Language
Cluster, x.y= Software Version.
CC= Closed Caption, BTSC= Broadcast Television Systems Committee, CMB=
Comb Filter, DW = Double Window
L04L AA
Service Modes, Error Codes, and Fault Finding
Circuit
Power supply
Line & Frame
Deflection
Tuner IF
Hercules
Features &
Connectivities
Audio Amplifier
Front Control
ECO Scavem
Features
CC+BTSC
CC+BTSC+CMB+DW
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.
Specifications
•
Tuning frequency: 61.25 MHz (channel 3).
•
Color system: NTSC M.
•
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. 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-favorite presets / channels.
–
Diagr.
Auto-storage of personal presets.
–
A1
Auto user menu time-out.
–
Auto Volume Leveling (AVL).
A2
How to enter
To enter SDM, use one of the following methods:
A3
•
Press the following key sequence on the remote control
A4
transmitter: "062596" directly followed by the MENU button
A5
(do not allow the display to time out between entries while
A7
keying the sequence).
A9
•
Short jumper wires 9252 and 9275 on the family board (see
B1
Fig. 8-1) and apply AC power. Then press the power button
B2
(remove the short after start-up). Caution: Entering SDM
by shorting wires 9252 and 9275 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.
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 Alignment Mode.
00028
ERR 0 0 0 0 0
OP 000 057 140 032 120 128 000
L04L 0.12
Figure 5-1 SDM menu
SDM
E_14480_066.eps
240304
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