Service Modes, Error Codes, and Fault Finding
EN 26 L04L AA5.
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
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
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.
– Auto-storage of personal presets.
– Auto user menu time-out.
– Auto Volume Leveling (AVL).
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 jumper wires 9252 and 9275 on the family board (see
Fig. 8-1) and apply AC power. Then press the power button
(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.
Figure 5-1 SDM menu
Test point Circuit Diagr.
F508, F535, F536, F537, F552, F561, F563, F573, F664,
I513, I518, I519, I524, I531, I533, I546
Power supply A1
F401, F412, F413, F414, F418, F452, F453, F455, F456,
F458, F459, F460, F461, I408, I416, I417, I420, I462,
I468
Line & Frame
Deflection
A2
F003, F004, I001, I002 Tuner IF A3
F201, F203, F205, F206 Hercules A4
F240, F241, F242 Features &
Connectivities
A5
F952, F955, I951, I952 Audio Amplifier A7
F692 Front Control A9
F331, F332, F333, F338, F339, F341, F351, F353, F354 CRT Panel B1
F361, F362, F381, F382 ECO Scavem B2
SW Cluster SW name UOC Type Features
L4LLS1 L4LLS1_x.y
TDA12040H1/N1B501AO CC+BTSC
TDA12040H1/N1B511AP CC+BTSC+CMB+DW
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
00028 L04L 0.12 SDM
ERR 0 0 0 0 0
OP 000 057 140 032 120 128 000
E_14480_066.eps
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