EN 165.FTP2.4E AAService Modes, Error Codes, and Fault Finding
No pictureThe ComPair fault finding program is able to determine the
Check in CSM line TUNED BIT. In case the value is ?No?, install problem of the defective television. ComPair can gather
the required program again. Open the installation menu and diagnostic information in two ways:
perform manual installation.Automatic (by communication with the television): ComPair
can automatically read out the contents of the entire error
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No picture or unstable picturebuffer. Diagnosis is done on IC level. ComPair can access
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A scrambled or decoded signal is received.the IC 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
Black and white picture2
communicate (read and write) to devices on the IC buses
Check in CSM line COLOUR. In case the value is low (< "10"),
of the TV-set.
increase the ?Colour? value via the user menu. The new value
Manually (by asking questions to you): Automatic
is automatically stored for all TV channels.
diagnosis is only possible if the micro controller of the
television is working correctly and only to a certain extends.
No colours/colour lines around picture elements or
When this is not the case, ComPair will guide you through
colours not correct or unstable picture
the fault finding tree by asking you questions (e.g. Does the
1. Check in CSM line TV SYSTEM. If a ?strange? system pops
screen give a picture? Click on the correct answer: YES /
up, something has gone wrong during installation. Re-
NO) and showing you examples (e.g. Measure test-point I7
install the channel.
and click on the correct oscillogram you see on the
2. If in CSM line TV SYSTEM is ?L?, then the installed system
oscilloscope). You can answer by clicking on a link (e.g.
for this pre-set is ?France? (SECAM standard). if the
text or a waveform picture) that will bring you to the next
country requires a PAL standard, ?West Europe? is
step in the fault finding process.
required. Install the required program again: open the
By a combination of automatic diagnostics and an interactive
installation menu and perform manual installation. Select
question / answer procedure, ComPair will enable you to find
system ?West Europe?.
most problems in a fast and effective way.
Menu text not sharp enoughBeside fault finding, ComPair provides some additional
1. Press ?MENU?, ?TV?, ?PICTURE?, ?SMART PICTURE?. In features like:
case picture improves, decrease the contrast value. The Emulation of the Dealer Service Tool (DST), which is not
new value(s) are automatically stored for all TV channels.supported any more.
2. Check line ?Contrast?. If the value is high, decrease the If both ComPair and SearchMan (Electronic Service
contrast value.Manual) are installed, all the schematics and the PWBs of
the TV are available by clicking on the appropriate
5.3.2 Sound Problemshyperlink.
Example: Measure the DC-voltage on capacitor C2568
No sound from left and right speaker(Schematic/Panel) at the Mono-carrier.
Check line 6 ?Volume?. The value is low. Increase the value of - Click on the ?Panel? hyperlink to automatically show
?Volume?. The new value(s) are automatically stored (in the PWB with a highlighted capacitor C2568.
?personal? pre-set) for all TV channels.- Click on the ?Schematic? hyperlink to automatically
show the position of the highlighted capacitor.
5.4ComPair
5.4.3 Stepwise Start-up
5.4.1 Introduction
Under normal circumstances, a fault in the power supply, or an
error during start-up, will switch the television to protection
ComPair (Computer Aided Repair) is a service tool for Philips mode. ComPair can take over the initialisation of the television.
Consumer Electronics products. ComPair is a further In this way, it is possible to distinguish which part of the start-
development on the European DST (service remote control), up routine (hence which circuitry) is causing the problem.
which allows faster and more accurate diagnostics. ComPair Take notice that the transition between two steps can take
has three big advantages:some time, so give the TV some time to reach a stable state.
ComPair helps you to quickly get an understanding on how During the transition time, the LED can blink strangely.
to repair the chassis in a short time by guiding you
systematically through the repair procedures.Stepwise start-up explanation
ComPair allows very detailed diagnostics (on I2C level) and
This is realised via ComPair and is very helpful when a
is therefore capable of accurately indicating problem areas.
protection is activated (see also chapter ?Protections?). The
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You do not have to know anything about IC commands
following diagram shows the start-up procedure of the TV.
yourself because ComPair takes care of this.Every step of the stepwise start-up (also called trapped start-
ComPair speeds up the repair time since it can
up) in the diagram corresponds with the number of times the
automatically communicate with the chassis (when the
LED blinks.
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 fault finding 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.
For this chassis, the ComPair interface box and the TV
communicate via a bi-directional service cable via the service
connector. |
ACEC
