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5. Service Modes, Error Codes, and Fault Finding
Index of this chapter:
5.1 Test Points
5.2 Service Modes
5.3 Service Tools
5.4 Error Codes
5.5 The Blinking LED Procedure
5.7 Fault Finding and Repair Tips
5.1
Test Points
In the chassis schematics and layout overviews, the test points
(Fxxx) are mentioned. In the schematics, test points are
indicated with a rectangular box around "Fxxx" or "Ixxx", in the
layout overviews with a "half-moon" sign.
As most signals are digital, it will be difficult to measure
waveforms with a standard oscilloscope. Several key ICs are
capable of generating test patterns, which can be controlled via
ComPair. In this way it is possible to determine which part is
defective.
Perform measurements under the following conditions:
•
Service Default Mode.
•
Video: Color bar signal.
•
Audio: 3 kHz left, 1 kHz right.
5.2
Service Modes
The Service Mode feature is split into four parts:
•
Service Default Mode (SDM).
•
Service Alignment Mode (SAM).
•
Customer Service Mode (CSM) and Digital Customer
Service Mode (DCSM).
•
Computer Aided Repair Mode (ComPair).
SDM and SAM offer features, which can be used by the Service
engineer to repair/align a TV set. Some features are:
•
A pre-defined situation to ensure measurements can be
made under uniform conditions (SDM).
•
Activates the blinking LED procedure for error identification
when no picture is available (SDM).
•
The possibility to overrule software protections when SDM
was entered via the Service pins.
•
Make alignments (e.g. white tone), (de)select options,
enter options codes, reset the error buffer (SAM).
•
Display information ("SDM" or "SAM" indication in upper
right corner of screen, error buffer, software version,
operating hours, options and option codes, submenus).
The (D)CSM is a Service Mode that can be enabled by the
consumer. Instructions on how to enable the CSM can be given
by telephone by either the dealer or the P3C (Philips Customer
Care Center). The CSM displays diagnosis information, which
the customer can forward to the dealer/P3C. In CSM mode,
"CSM", is displayed in the top right corner of the screen.
The information provided in CSM and the purpose of CSM is to:
•
Increase the home repair hit rate
•
Decrease the number of nuisance calls
•
Solved customers' problem without home visit
ComPair Mode is used for communication between a computer
and a TV on I2C /UART level and can be used by a Service
engineer to quickly diagnose the TV set by reading out error
codes, read and write in NVMs, communicate with ICs and the
uP (PWM, registers, etc.), and by making use of a faultfinding
database. It will also be possible to up and download the
software of the TV set via I2C with help of ComPair. To do this,
ComPair has to be connected to the TV set via the ComPair
connector, which will be accessible through the rear of the set
(without removing the rear cover).
Service Modes, Error Codes, and Fault Finding
LC7.1L LA
5.2.1
General
Some items are applicable to all Service Modes or are general.
These are listed below.
Life Timer
During the life time cycle of the TV set, a life timer is kept. This
life timer counts the normal operation hours, but not the Stand-
by hours. The actual value of the life timer is displayed in SDM
and CSM in a decimal value. Every two soft-resets should
increase the hour by +1. Minimal five digits are displayed.
Software Identification, Version, and Cluster
The software identification, version, and cluster will be shown
in the main menu display of SDM, SAM, and CSM.
The screen will show: "AAAABCD X.YY", where:
•
AAAA is the chassis name: LC71 for analogue range
(non-DVB), LC72 for digital range (DVB).
•
B is the region indication: E= Europe, A= AP/China, U=
NAFTA, L= LATAM.
•
C is the display indication: L= LCD, P= Plasma.
•
D is the language/features indication: 1= standard, H=
1080p full HD.
•
X is the main version number: The main version number is
updated with a major change of specification (incompatible
with the previous software version). Numbering will go from
1 - 9 then from A - Z.
–
If the main version number changes, the new version
number is written in the NVM
–
If the main version number changes, the default
settings are loaded
•
YY is the sub version number: The sub version number is
updated with a minor change (backwards compatible with
the previous versions) Numbering will go from 00 - 99.
–
If the sub version number changes, the new version
number is written in the NVM
–
If the NVM is fresh, the software identification, version,
and cluster will be written to NVM
5.
EN 15
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