Table of Contents
Advertisement
5. Service Modes, Error Codes and Fault Finding
Index of this chapter:
1. Test Points
2. Service Modes
3. Problems and Solving Tips (related to TV-settings).
4. ComPair
5. Error Codes
6. Protections
7. Repair/Service Tips
5.1
Test Points
5.1.1
General Test Conditions
Perform the measurements under the following conditions:
•
Service Default Mode.
•
Video: Colour bar signal.
•
Audio: 3 kHz left, 1 kHz right.
5.1.2
Waveform Test Points
The chassis is equipped with test points, which are, in most
cases, printed on the circuit board assemblies (if not, please
check chapter 6 'test point overview'). They refer to the
functional blocks. The test points have names starting with I for
IF, S for sound etc. The numbering is done in a logical
sequence for diagnostics.
Note: Not all test points are measured, but they can serve as
identification names in Service communication (e.g. ComPair
fault find trees, SearchMan files).
In the following cases, there will be no waveform:
•
When already a V
DC
or when the waveform does not have an added value.
•
External AV-inputs are not measured, as the waveform is
equal to the source (dependent of load resistor matching).
5.1.3
DC-voltage Test Points
From practically all semiconductor pins, the DC-voltages are
measured. These values are displayed in the circuit diagrams.
If a DC-value is displayed between brackets then this value is
measured in STANDBY-mode.
5.2
Service Modes
Service Default Mode (SDM) and Service Alignment Mode
(SAM) offer several features for the service technician, while
the Customer Service Mode (CSM) is used for communication
between a Philips Customer Care Centre (P3C) and a
customer.
There is also the option of using ComPair, a hardware interface
between a computer (see requirements below) and the TV
chassis. It offers the ability of structured troubleshooting, test
pattern generation, error code reading, software version
readout, and software upgrading.
Requirements: a Pentium processor, Windows 95/98, and a
CD-ROM drive (see also paragraph 5.4).
5.2.1
Service Default Mode (SDM)
Purpose
•
To create a pre-defined setting to get the same
measurement results as given in this manual.
•
To override SW protections (only when SDM is entered via
the 'service pins' on SSP connector 0356).
Service Modes, Error Codes and Fault Finding
voltage is displayed in the diagrams,
MG3.2E
Specifications
•
Tuning frequency: 475.25 MHz for PAL/SECAM.
•
Colour system: SECAM L for France or PAL B/G for the
rest of Europe.
•
All picture settings at 50 % (brightness, colour, contrast).
•
All sound settings at 50 % (except volume: at 25 %).
•
All service-unfriendly modes (if present) are disabled, like:
–
(sleep) timer,
–
child/parental lock,
–
blue mute,
–
auto switch-off (when no 'IDENT' video signal was
received for 10 minutes),
–
skip/blank of non-favourite pre-sets,
–
smart modes,
–
auto store of personal presets,
–
auto user menu time-out.
How to Enter SDM
Use one of the following methods:
•
Use the standard RC-transmitter and key in the code
0 6 2 5 9 6, directly followed by the 'MENU' button.
Note: It is possible that, together with the SDM, the main
menu will appear. To switch it off, push the 'MENU' button
again).
•
Short pins 2 and 3 on connector 0356 of the SSP (see Fig.
'SSP Component Side' in chapter 8) while the set is in the
normal operation mode.
Caution: Entering SDM by this method will override all the
processor-controlled protections. When doing this, the
service-technician must know exactly what he is doing, as
it could lead to damaging the set.
•
Use the 'DEFAULT' button on the Dealer Service Tool
(RC7150).
•
Use the DST-emulation feature of ComPair.
SDM Menu
Figure 5-1
After entering SDM, a blank screen is visible, with 'Service
Default' in the lower right part for recognition.
How to Navigate
To toggle to the SAM mode, use a standard customer RC-
transmitter and key in the code 0 6 2 5 9 6, directly followed by
the 'OSD (i+)' key.
How to Exit
Switch the set to STANDBY by pressing the Standby button( )
on the remote control transmitter. If you switch the set 'off' via
the mains switch, the set will return in SDM when Mains power
is re-applied.
5.
EN 29
S e r v i c e
D e f a u l t
CL 16532044_031.eps
140501
Advertisement
Table of Contents
