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GB 18
5.
Colours not correct / unstable picture
Check CSM line 4. Wrong colour system installed. To change
the setting:
1. Press the 'MENU' button on the remote control.
2. Select the INSTALL sub menu.
3. Select the MANUAL STORE sub menu.
4. Select and change the COLOUR SYSTEM setting until
picture and sound are correct.
5. Select the STORE menu item.
TV switches off or changes channel without any user
action
The TV-set switches off after 'TV SWITCHING OFF' was
displayed.
Auto standby switched the set off because:
•
There was no ident signal for more than 15 minutes.
•
There was no remote control signal received or local key
pressed for > 2 hours.
See chapter 8 for a description on the options to enable/
disable auto standby
Picture too dark or too bright
•
Press 'Smart Picture' button on the remote control. In
case the picture improves, increase / decrease the
brightness value or increase / decrease the contrast
value. The new 'Personal Preference' value is
automatically stored after 3 minutes.
•
After switching on the Customer Service Mode the
picture is OK. Increase / decrease the brightness value
or increase / decrease the contrast value. The new
'Personal Preference' value is automatically stored after
3 minutes.
White line around picture elements and text
•
Press 'Smart Picture' button on the remote control. In
case the picture improves, decrease the sharpness
value. The new 'Personal Preference' value is
automatically stored after 3 minutes.
•
After switching on the Customer Service Mode the
picture is OK. Decrease the sharpness value. The new
'Personal Preference' value is automatically stored after
3 minutes.
Snowy picture
Check CSM line 5. If this line indicates NO SIGNAL, check
following:
•
no or bad antenna signal; connect a proper antenna
signal
•
antenna not connected; connect the antenna
•
no channel / pre-set is stored at this program number; go
to the INSTALL menu and store a proper channel at this
program number
•
the tuner is faulty (in this case the CODES line will
contain number 13 or 16); check the tuner and replace/
repair if necessary
Snowy picture and/or unstable picture
•
A scrambled or decoded signal is received.
Black and white picture
•
Press 'Smart Picture' button on the remote control. In
case picture improves, increase the COLOUR value. The
new 'Personal Preference' value is automatically stored
after 3 minutes.
•
After switching on the Customer Service Mode the
picture is OK. Increase the COLOUR value. The new
'Personal Preference' value is automatically stored after
3 minutes.
Menu text not sharp enough
•
Press 'Smart Picture' button on the remote control. In
case the picture improves, decrease the CONTRAST
EM1A
Fault finding and repair tips
value. The new 'Personal Preference' value is
automatically stored after 3 minutes.
•
After switching on the Customer Service Mode the
picture is OK. Decrease the CONTRAST value. The new
'Personal Preference' value is automatically stored after
3 minutes.
5.3.2
Sound problems
No sound or sound too loud (after channel change /
switching on)
•
After switching on the Customer Service Mode the
volume is OK. Increase / decrease the volume level. The
new 'Personal Preference' value is automatically stored
after 3 minutes.
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 DST service remote control allowing
faster and more accurate diagnostics. ComPair has three big
advantages:
1. ComPair helps you to quickly get an understanding how
to repair the EM1A in short time by guiding you step by
step through the repair procedures.
2. ComPair allows very detailed diagnostics (on I2C level)
and is therefore capable of accurately indicating problem
areas. You do not have to know anything about I2C
commands yourself; ComPair takes care of this.
3. ComPair speeds up the repair time since it can
automatically communicate with the EM1A (when the
microprocessor is working) and all repair information is
directly available. When ComPair is installed together
with the SearchMan EM1A electronic manual,
schematics and PWBs are only a mouse-click away.
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 EM1A chassis, the
ComPair interface box and the TV communicate via a bi-
directional service cable via the service connector at the rear
side of the set (located at the left side of the rear cinch
connectors, see also figure 1-2).
The ComPair faultfinding program is able to determine the
problem of the defective television. ComPair can gather
diagnostic information in 2 ways:
1. Communication to the television (automatic)
2. Asking questions to you (manually)
ComPair combines this information with the repair
information in its database to find out how to repair the TV-
set.
Automatic information gathering
Reading out the error buffer, 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.
Manual information gathering
Automatic diagnosis is only possible if the micro controller of
the television is working correctly and only to a certain
extend. When this is not the case, ComPair will guide you
through the faultfinding tree by asking you questions and
showing you examples. 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.
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