Service Modes, Error Codes, and Fault Finding
5.
No picture
Check in CSM line TUNED BIT. In case the value is “No”, install
the required program again. Open the installation menu and
perform manual installation.
No picture or unstable picture
A scrambled or decoded signal is received.
Black and white picture
Check in CSM line COLOUR. In case the value is low (< "10"),
increase the “Colour” value via the user menu. The new value
is automatically stored for all TV channels.
No colours/colour lines around picture elements or
colours not correct or unstable picture
1.
Check in CSM line TV SYSTEM. If a “strange” system pops
up, something has gone wrong during installation. Re-
install the channel.
2.
If in CSM line TV SYSTEM is “L”, then the installed system
for this pre-set is “France” (SECAM standard). if the
country requires a PAL standard, “West Europe” is
required. Install the required program again: open the
installation menu and perform manual installation. Select
system “West Europe”.
Menu text not sharp enough
1.
Press “MENU”, “TV”, “PICTURE”, “SMART PICTURE”. In
case picture improves, decrease the contrast value. The
new value(s) are automatically stored for all TV channels.
2.
Check line “Contrast”. If the value is high, decrease the
contrast value.
5.3.2
Sound Problems
No sound from left and right speaker
Check line 6 “Volume”. The value is low. Increase the value of
“Volume”. The new value(s) are automatically stored (in
“personal” pre-set) for all TV channels.
5.4
ComPair
5.4.1
Introduction
ComPair (Computer Aided Repair) is a service tool for Philips
Consumer Electronics products. ComPair is a further
development on the European DST (service remote control),
which allows faster and more accurate diagnostics. ComPair
has three big advantages:
•
ComPair helps you to quickly get an understanding on how
to repair the chassis in a short time by guiding you
systematically through the repair procedures.
•
ComPair allows very detailed diagnostics (on I
2
C level) and
is therefore capable of accurately indicating problem areas.
You do not have to know anything about I
2
C commands
yourself because ComPair takes care of this.
•
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 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.
The ComPair fault finding 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 I
2
C level. ComPair can access
the I
2
C bus of the television. ComPair can send and
receive I
2
C 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 I
2
C buses
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 fault finding 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 fault finding 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:
•
Emulation of the Dealer Service Tool (DST), which is not
supported any more.
•
If both ComPair and SearchMan (Electronic Service
Manual) are installed, all the schematics and the PWBs of
the TV 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
Stepwise Start-up
Under normal circumstances, a fault in the power supply, or an
error during start-up, will switch the television to protection
mode. ComPair can take over the initialisation of the television.
In this way, it is possible to distinguish which part of the start-
up routine (hence which circuitry) is causing the problem.
Take notice that the transition between two steps can take
some time, so give the TV some time to reach a stable state.
During the transition time, the LED can blink strangely.
Stepwise start-up explanation
This is realised via ComPair and is very helpful when a
protection
is activated (see also chapter “Protections”). The
following diagram shows the start-up procedure of the TV.
Every step of the stepwise start-up (also called trapped start-
up) in the diagram corresponds with the number of times the
LED blinks.
