Specifications

Service Modes, Error Codes, and Fault Finding
EN 22 L03.2U AA5.
• ComPair speeds up the repair time since it can
automatically communicate with the chassis (when the
microprocessor is working) and all repair information is
directly available. When ComPair is installed together with
the SearchMan electronic manual of the defective chassis,
schematics and PWBs are only a mouse click away.
5.4.2 Specifications
ComPair consists of a Windows based faultfinding program
and an interface box between PC and the (defective) product.
The ComPair interface box is connected to the PC via a serial
or RS232 cable.
In case of the L01 chassis, the ComPair interface box and the
TV communicate via a bi-directional service cable via the
service connector (located on the Main panel, (see figure "Top
view Mono Carrier".in chapter 8 "Alignments").
The ComPair faultfinding program is able to determine the
problem of the defective television. ComPair can gather
diagnostic information in two ways:
• Automatic (by communication with the television):
ComPair can automatically read out the contents of the
entire error buffer. Diagnosis is done on I2C level. ComPair
can access the I2C bus of the television. ComPair can
send and receive I2C commands to the micro controller of
the television. In this way, it is possible for ComPair to
communicate (read and write) to devices on the I2C
busses of the TV-set.
• Manually (by asking questions to you): Automatic
diagnosis is only possible if the micro controller of the
television is working correctly and only to a certain extends.
When this is not the case, ComPair will guide you through
the faultfinding tree by asking you questions (e.g. Does the
screen give a picture? Click on the correct answer: YES /
NO) and showing you examples (e.g. Measure test-point I7
and click on the correct oscillogram you see on the
oscilloscope). You can answer by clicking on a link (e.g.
text or a waveform picture) that will bring you to the next
step in the faultfinding process.
By a combination of automatic diagnostics and an interactive
question / answer procedure, ComPair will enable you to find
most problems in a fast and effective way.
Beside fault finding, ComPair provides some additional
features like:
• Up- or downloading of pre-sets.
• Managing of pre-set lists.
• Emulation of the Dealer Service Tool (DST).
• If both ComPair and SearchMan (Electronic Service
Manual) are installed, all the schematics and the PWBs of
the set are available by clicking on the appropriate
hyperlink.
Example: Measure the DC-voltage on capacitor C2568
(Schematic/Panel) at the Mono-carrier.
– Click on the 'Panel' hyperlink to automatically show the
PWB with a highlighted capacitor C2568.
– Click on the 'Schematic' hyperlink to automatically
show the position of the highlighted capacitor.
5.4.3 How To Connect ComPair
1. First, install the ComPair Browser software (see the Quick
Reference Card for installation instructions).
2. Connect the RS232 interface cable between a free serial
(COM) port of your PC and the PC connector (marked with
“PC”) of the ComPair interface.
3. Connect the AC power adapter to the supply connector
(marked with “POWER 9V DC”) on the ComPair interface.
4. Switch the ComPair interface OFF.
5. Switch the television set OFF (remove the AC power).
6. Connect the ComPair interface cable between the
connector on the rear side of the ComPair interface
(marked with “I2C”) and the ComPair connector on the
mono carrier (see figure "Top view Mono Carrier".in
chapter 8 "Alignments").
7. Plug the AC power adapter in the AC power outlet and
switch on the interface. The green and red LEDs light up
together. The red LED extinguishes after approx. 1 second
while the green LED remains lit.
8. Start the ComPair program and read the “introduction”
chapter.
Figure 5-2 ComPair connection
5.4.4 How To Order
ComPair order codes:
• ComPair Software: ST4191.
• ComPair Interface Box: 4822 727 21631.
• AC Adapter: T405-ND.
• ComPair Quick Start Guide: ST4190.
Note: If you encounter any problems, contact your local
support desk.
5.4.5 Error Buffer
The error code buffer contains all detected errors since the last
time the buffer was erased. The buffer is written from left to
right. When an error occurs that is not yet in the error code
buffer, it is written at the left side and all other errors shift one
position to the right.
5.4.6 How To Read The Error Buffer
You can read the error buffer in 3 ways:
• On screen via the SDAM (only if you have a picture).
Examples:
– ERROR: 0 0 0 0 0: No errors detected
– ERROR: 6 0 0 0 0: Error code 6 is the last and only
detected error
– ERROR: 9 6 0 0 0: Error code 6 was first detected and
error code 9 is the last detected (newest) error
• Via the blinking LED procedure (when you have no
picture). See next paragraph.
• Via ComPair.
5.4.7 How To Clear The Error Buffer
The error code buffer is cleared in the following cases:
• By activation of the CLEAR command in the SDAM menu:
• If the content of the error buffer has not changed for 50
hours, it resets automatically.
Note:
When leaving SDAM by disconnecting the set from AC power,
the error buffer is not reset.
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