Philips EM5E AA Service Manual page 29

• 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 EM5E chassis, the ComPair interface box and
the TV communicate via a bi-directional service cable via the
service connector.
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 I
2
can access the I C bus of the television. ComPair can send
2
and receive I 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
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 Stepwise Start-up / Shut-down
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.
Stepwise start- up explanation
This is realised via ComPair and is very helpful when a
protection is activated (see also chapter 5.7).
Service Modes, Error Codes and Fault Finding
2
C level. ComPair
2
C busses
EM5E
Table 5-1 Stepwise start-up table
State Description mode
0 Low power stdby:
5V2/3V3 present, uP in
stdby-mode
1 High power Stdby:
TV-set in stdby-mode
2 SSB is powered by std-
by-supply (5V/8V).
Degaussing (12 s) has
been activated.
3 Semi stdby-mode:
HIP, HOP, MSP and
Tuner initialized lead-
ing to semi stdby-
mode.
4 All ICs are initialized,
HOP activates the
main supply, EHT-gen-
eration starts, black
current stabilization is
on
5 TV On:
TV-set operates, un-
blanked picture.
Stepwise shut-down explanation
In the stepwise shutdown mode, state 2 and 4 are skipped.
Table 5-2 Stepwise shut-down table
State Description mode
5 TV On:
TV-set operates, un-
blanked picture
3 Semi stdby-mode:
SSB is powered by the
stdby-supply
1 High power stdby:
TV-set in stdby-mode
0 Low power stdby:
5V2/3V3 present,
uP in stdbymode
Note (*): When the set is in stepwise mode and, due to
stepping-up, a protection is activated, the set will really go into
protection (blinking LED). The set will not leave the stepwise-
mode however. By stepping up, the set can be activated again,
until state X where the protection was activated. At state (X-1)
diagnostic measurements can be performed.
5.4.4 How To Connect
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 mains adapter to the supply connector
(marked with 'POWER 9V DC') of the ComPair interface.
4. Switch the ComPair interface 'OFF'.
5. Switch the television set 'OFF' with the mains switch.
6. Connect the ComPair interface cable between the
connector on the rear side of the ComPair interface
2
(marked with 'I C') and the ComPair connector at the rear
side of the TV (situated just below the tuner input, see also
chapter 4).
5. EN 29
Display LED Enabled pro-
(Red) tection
On None
Wait 1s, flash None
1 x
Wait 1s, flash 1, 4, 5, 6 & 18
2 x
Wait 1s, flash
3 x
Wait 1s, flash Plus 2 & 16
4 x
Wait 1s, flash
5 x
Display LED Disabled
(Red) (*) protections
Wait 1s, -
flash 5 x
Wait 1s, 2 & 16
flash 3 x
Wait 1s, 1, 4, 5, 6 & 18
flash 1 x
On