Philips 7629, Service Manual

Page: 36 / 374

Specifications
ComPair consists of a Windows based faultfinding program and an interface box
between PC and the product. The ComPair interface box is connected to the PC via a
serial or RS232 cable.
In the case of the L01 chassis, the ComPair interface box and the TV communicate via
a bi-directional service cable via the service connector (Connector 0267).
The ComPair faultfinding program is able to determine the problem of the television set.
ComPair can gather diagnostic information in two ways:
•
Automatic (by communication with the television): ComPair can automatically
read 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 microprocessor 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 the servicer): Automatic diagnosis is only
possible if the microprocessor of the television is working correctly, and only to a
certain extent. When this is not the case, ComPair will guide you through the
faultfinding tree by asking you questions (for example; Does the screen give a
picture? Click on the correct answer: YES / NO) and showing you examples (for
example; Measure test-point I7 and click on the correct oscillogram you see on
the oscilloscope). You can answer by clicking on a link (for example, 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 and 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:
•
Uploading or downloading of presets.
•
Management of preset lists.