Service Modes, Error Codes, and Fault Finding
5.
5.
Service Modes, Error Codes, and Fault Finding
Index of this chapter:
5.1 Test Points
5.2 Service Modes
5.3 Stepwise Start-up
5.4 Service Tools
5.5 Error Codes
5.6 The Blinking LED Procedure
5.7 Protections
5.8 Fault Finding and Repair Tips
5.9 Software Upgrading
5.1
Test Points
As most signals are digital, it will be difficult to measure
waveforms with a standard oscilloscope. However, several key
ICs are capable of generating test patterns, which can be
controlled via ComPair. In this way it is possible to determine
which part is defective.
Perform measurements under the following conditions:
•
Service Default Mode.
•
Video: Colour bar signal.
•
Audio: 3 kHz left, 1 kHz right.
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 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 abilities of structured troubleshooting, error code
reading, and software version read-out for all chassis.
(see also paragraph “ComPair”).
5.2.1
Service Default Mode (SDM)
Purpose
•
To create a pre-defined setting, to get the same
measurement results as given in this manual.
•
To override SW protections detected by stand-by
processor and make the TV start up to the step just before
protection (a sort of automatic stepwise start up). See
paragraph “Stepwise Start Up”.
•
To override SW protections detected by MIPS. See also
paragraph “Error codes”.
•
To start the blinking LED procedure (not valid for
protections detected by standby software).
Specifications
Table 5-1 SDM default settings
•
All picture settings at 50% (brightness, colour, contrast).
•
All sound settings at 50%, except volume at 25%.
•
All service-unfriendly modes (if present) are disabled, like:
–
(Sleep) timer.
–
Child/parental lock.
–
Picture mute (blue mute or black mute).
–
Automatic volume levelling (AVL).
–
Skip/blank of non-favourite pre-sets.
How to Activate SDM
For this chassis there are two kinds of SDM: an
analogue
SDM
and a
digital
SDM
. Tuning will happen according table “SDM
Default Settings”.
•
Analogue
SDM
: use the standard RC-transmitter and key
in the code “062596”, directly followed by the “MENU”
button.
Note:
It is possible that, together with the SDM, the main
menu will appear. To switch it “off”, push the “MENU”
button again.
•
Digital
SDM
: use the standard RC-transmitter and key in
the code “062593”, directly followed by the “MENU” button.
Note:
It is possible that, together with the SDM, the main
menu will appear. To switch it “off”, push the “MENU”
button again.
•
Analogue
SDM
can also be activated by shorting for a
moment the two solder pads [1] (see figure “Service mode
pads”) on the SSB, with the indication “SDM”. Activation
can be performed in all modes, except when the set has a
problem with the Stand-by Processor.
Figure 5-1 Service mode pads
After activating this mode, “SDM” will appear in the upper right
corner of the screen (if you have picture).
How to Navigate
When you press the “MENU” button on the RC transmitter, the
set will toggle between the SDM and the normal user menu
(with the SDM mode still active in the background).
How to Exit SDM
Use one of the following methods:
•
Switch the set to STAND-BY via the RC-transmitter.
•
Via a standard customer RC-transmitter: key in “00”-
sequence.
5.2.2
Service Alignment Mode (SAM)
Purpose
•
To perform (software) alignments.
•
To change option settings.
•
To easily identify the used software version.
•
To view operation hours.
•
To display (or clear) the error code buffer.
Region
Freq. (MHz)
Default
system
Europe, AP(PAL/Multi)
475.25
PAL B/G
Europe, AP DVB-T
546.00 PID
Video: 0B 06 PID
PCR: 0B 06 PID
Audio: 0B 07
DVB-T
H_17650_0
88
.ep
s
16010
8
S
DM
S
DM
