Always respect voltages. While some may not be dangerous in themselves, they can cause unexpected reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.
It should be noted that
on the European Service website, “Alternative BOM” is referred to as “Design
variant”.
The
third digit in the serial number (example: AG2B0335000001) indicates the number
of the alternative B.O.M. (Bill Of Materials) that has been used for producing
the specific TV set. In general, it is possible that the same TV model on the
market is produced with e.g. two different types of displays, coming from two
different suppliers. This will then result in sets which have the same CTN
(Commercial Type Number; e.g. 28PW9515/12) but which have a different B.O.M.
number.
By
looking at the third digit of the serial number, one can identify which B.O.M.
is used for the TV set he is working with.
If the third digit of the serial number contains the number “1”
(example: AG1B033500001), then the TV set has been manufactured according to
B.O.M. number 1. If the third digit is a “2” (example: AG2B0335000001), then
the set has been produced according to B.O.M. no. 2. This is important for
ordering the correct spare parts. For the third digit, the numbers 1...9 and
the characters A...Z can be used, so in total: 9 plus 26= 35 different B.O.M.s
can be indicated by the third digit of the serial number.
Identification: The
bottom line of a type plate gives a 14-digit serial number. Digits 1 and 2
refer to the production centre (e.g. AG is Bruges), digit 3 refers to the
B.O.M. code, digit 4 refers to the Service version change code, digits 5 and 6
refer to the production year, and digits 7 and 8 refer to production week (in
example below it is 2006 week 17). The 6 last digits contain the serial number.
Board Level Repair (BLR) or Component Level Repair (CLR)
If
a board is defective, consult your repair procedure to decide if the board has
to be exchanged or if it should be repaired on component level.
If
your repair procedure says the board should be exchanged completely, do not
solder on the defective board. Otherwise, it cannot be returned to the O.E.M.
supplier for back charging.
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: Colour bar signal.
•
Audio: 3 kHz left, 1 kHz right.
The
Service Mode feature is split into four parts:
•
Service Default Mode (SDM).
•
Service Alignment Mode (SAM).
•
Customer Service Mode (CSM).
•
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, sub
menus).
The
CSM is a Service Mode that can be enabled by the consumer. The CSM displays
diagnosis information, which the customer can forward to the dealer or call
centre. 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 fault finding 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 compare
connector, which will be accessible through the rear of the set (without
removing the rear cover).
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 timer is kept. It counts the normal
operation hours (not the Stand-by hours). The actual value of the timer is
displayed in SDM and CSM in a decimal value. Every two soft-resets increase the
hour by +1.
Software Identification, Version, and Cluster
The
software ID, 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: LC82.
•
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/feature indication: 1= standard, H=1080p full HD.
•
X is the main version number: this is updated with a major change of
specification (incompatible with the previous software version). Numbering will
go from 1 - 9 and 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: this 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.
Display Option Code Selection
When
after an SSB or display exchange, the display option code is not set properly,
it will result in a TV with “no display”.
Therefore, it is required to set this display option code after such a repair.
To
do so, press the following key sequence on a standard RC transmitter: “062598”
directly followed by MENU and “xxx”, where “xxx” is a 3 digit decimal value of
the panel type: see column “Display code” in table “Option code overview” (ch.
8), or see sticker on the side/bottom of the cabinet. When the value is
accepted and stored in NVM, the set will switch to Stand-by, to indicate that
the process has been completed.
During
this algorithm, the NVM-content must be filtered, because several items in the
NVM are TV-related and not SSB related (e.g. Model and Prod. S/N). Therefore,
“Model” and “Prod. S/N” data is changed into “See Type Plate”. In case a call
centre or consumer reads “See Type Plate” in CSM mode, he needs to look to the
side/bottom sticker to identify the set, for further actions.
Service Default Mode (SDM)
Set
the TV in SDM mode in order to be able to:
•
Create a pre-defined setting for measurements to be made.
•
Override software protections.
•
Start the blinking LED procedure.
•
Read the error buffer.
•
Check the life timer.
SDM default settings
•
Set linear video and audio settings to 50%, but volume to 25%. Stored user
settings are not affected.
•
All service-unfriendly modes (if present) are disabled, since they interfere
with diagnosing/repairing a set. These service unfriendly modes are:
–
(Sleep) timer.
–
Blue mute/Wall paper.
–
Auto switch “off” (when there is no “ident” signal).
–
Hotel or hospital mode.
–
Child lock or parental lock (manual or via V-chip).
–
Skipping, blanking of “Not favourite”, “Skipped” or “Locked” presets/channels.
–
Automatic storing of Personal Preset or Last Status settings.
–
Automatic user menu time-out (menu switches back/OFF automatically.
–
Auto Volume levelling (AVL).
How to Activate
To
activate SDM, use one of the following methods:
•
Press the following key sequence on the remote control transmitter: “062596”
directly followed by the MENU button (do not allow the display to time out
between entries while keying the sequence).
•
Short one of the “Service” jumpers on the TV board during cold start (see
Figures “Service jumper”). Then press the mains button (remove the short after
start-up).
Caution:
Activating SDM by shorting “Service” jumpers will override the DC speaker
protection (error 1), the General I2C error (error 4), and the Trident video
processor error (error 5). When doing this, the service-technician must know
exactly what he is doing, as it could damage the television set.
Service jumper position
On Screen Menu
After
activating SDM, the following screen is visible, with SDM in the upper right
corner of the screen to indicate that the television is in Service Default
Mode.
Menu
explanation:
•
HHHHH: Are the operating hours (in decimal).
•
AAAABCD-X.YY: See paragraph “Service Modes” ->“General” -> “Software Identification,
Version, and Cluster” for the SW name definition.
•
SDM: The character “SDM” to indicate that the TV set is in Service mode.
•
ERR: Shows all errors detected since the last time the buffer was erased. Five
errors possible.
•
OP: Used to read-out the option bytes. See “Options” in the Alignments section
for a detailed description. Seven codes are possible.
How to Navigate
As
this mode is read only, there is not much to navigate. To switch to other
modes, use one of the following methods:
•
Command MENU from the user remote will enter the normal user menu (brightness,
contrast, colour, etc...) with “SDM” OSD remaining, and pressing MENU key again
will return to the last status of SDM again.
•
To prevent the OSD from interfering with measurements in SDM, command “OSD”
(“STATUS” for NAFTA and LATAM) from the user remote will toggle the OSD
“on/off” with “SDM” OSD remaining always “on”.
•
Press the following key sequence on the remote control transmitter: “062596”
directly followed by the OSD/STATUS/INFO/i+ button to switch to SAM (do not
allow the display to time out between entries while keying the sequence).
How to Exit
Switch
the set to STANDBY by pressing the mains button on the remote control
transmitter or on the television set.
If
you switch the television set “off” by removing the mains (i.e., unplugging the
television), the television set will remain in SDM when mains is re-applied,
and the error buffer is not cleared.
The
error buffer will only be cleared when the “clear” command is used in the SAM
menu.
Note:
•
If the TV is switched “off” by a power interrupt while in SDM, the TV will show
up in the last status of SDM menu as soon as the power is supplied again. The
error buffer will not be cleared.
•
In case the set is in Factory mode by accident (with “F” displayed on screen),
by pressing and hold “VOL-” and “CH-” together should leave Factory mode.
Service Alignment Mode (SAM)
Purpose
•
To change option settings.
•
To display / clear the error code buffer.
•
To perform alignments.
Specifications
•
Operation hours counter (maximum five digits displayed).
•
Software version, error codes, and option settings display.
•
Error buffer clearing.
•
Option settings.
•
Software alignments (Tuner, White Tone, and Audio).
•
NVM Editor.
•
ComPair Mode switching.
•
Set the screen mode to full screen (all contents on screen are viewable).
How to Activate
To
activate SAM, use one of the following methods:
•
Press the following key sequence on the remote control transmitter: “062596”
directly followed by the OSD/STATUS/INFO/i+ button (it depends on region which
button is present on the RC). Do not allow the display to time out between
entries while keying the sequence.
•
Or via ComPair.
After
entering SAM, the following screen is visible, with SAM in the upper right
corner of the screen to indicate that the television is in Service Alignment
Mode.
Menu
explanation:
1.
LLLLL. This represents the run timer. The run timer counts normal operation
hours, but does not count Stand-by hours.
2.
AAAABCD-X.YY. See paragraph “Service Modes” ->“General” -> “Software
Identification, Version, and Cluster” for the SW name definition.
3.
SAM. Indication of the Service Alignment Mode.
4.
ERR (ERRor buffer). Shows all errors detected since the last time the buffer
was erased. Five errors possible.
5.
OP (Option Bytes). Used to read-out the option bytes. See “Options” in the
Alignments section for a detailed description. Seven codes are possible.
6.
Clear. Erases the contents of the error buffer. Select the CLEAR menu item and
press the MENU RIGHT key. The content of the error buffer is cleared.
7.
Options. Used to set the option bits. See “Options” in the “Alignments” chapter
for a detailed description.
8.
Tuner. Used to align the tuner. See “Tuner” in the “Alignments” chapter for a
detailed description.
9.
RGB Align. Used to align the White Tone. See “White Tone” in the “Alignments”
chapter for a detailed description.
10.
NVM Editor. Can be used to change the NVM data in the television set. See also
paragraph “Fault Finding and Repair Tips” further on.
11.
ComPaIr. Can be used to switch the television to “In Application Programming”
mode (IAP), for software uploading via ComPair. Read paragraph “Service Tools”
- > “ComPair”.
Caution:
When this mode is selected without compare connected, the TV will be blocked.
Remove the AC power to reset the TV.
12.
SW Events. Only to be used by development to monitor SW behaviour during stress
test.
How to Navigate
•
In the SAM menu, select menu items with the MENU UP/DOWN keys on the remote
control transmitter. The selected item will be indicated. When not all menu
items fit on the screen, use the MENU UP/DOWN keys to display the next /
previous menu items.
•
With the MENU LEFT/RIGHT keys, it is possible to:
–
Activate the selected menu item.
–
Change the value of the selected menu item.
–
Activate the selected sub menu.
•
When you press the MENU button twice while in top level SAM, the set will
switch to the normal user menu (with the SAM mode still active in the
background). To return to the SAM menu press the MENU button.
•
Command OSD/STATUS/INFO/i+ button from the user remote will toggle the OSD
“on/off” with “SAM” OSD remaining always “on”.
•
Press the following key sequence on the remote control transmitter: “062596”
directly followed by the MENU button to switch to SDM (do not allow the display
to time out between entries while keying the sequence).
How
to Store SAM Settings
To
store the settings changed in SAM mode (except the OPTIONS settings), leave the
top level SAM menu by using the POWER button on the remote control transmitter
or the television set.
How to Exit
Switch
the set to STANDBY by pressing the mains button on the remote control
transmitter or the television set.
Note:
•
When the TV is switched “off” by a power interrupt while in SAM, the TV will
show up in “normal operation mode” as soon as the power is supplied again. The
error buffer will not be cleared.
•
In case the set is in Factory mode by accident (with “F” displayed on screen),
by pressing and hold “VOL-” and “CH-” together should leave Factory mode.
Customer
Service Mode (CSM)
The
Customer Service Mode shows error codes and information on the TV’s operation
settings. A call centre can instruct the customer (by telephone) to enter CSM
in order to identify the status of the set. This helps them to diagnose
problems and failures in the TV before making a service call. The CSM is a read-only mode; therefore,
modifications are not possible in this mode.
Specifications
•
Ignore “Service unfriendly modes”.
•
Line number for every line (to make CSM language independent).
•
Set the screen mode to full screen (all contents on screen are viewable).
•
After leaving the Customer Service Mode, the original settings are restored.
•
Possibility to use “CH+” or “CH-” for channel surfing, or enter the specific
channel number on the RC.
How to Activate
To
activate CSM, press the following key sequence on the remote control
transmitter: “123654” (do not allow the display to time out between entries
while keying the sequence).
Upon
entering the Customer Service Mode, the following screen will appear:
Menu
Explanation
1.
MODEL. Type number, e.g. 32PFL7762D/05. (*)
2.
PROD S/N. Product serial no., e.g. AG1A0712123456. (*)
3.
SW ID. Software cluster and version is displayed.
4.
OP. Option code information.
5.
CODES. Error buffer contents.
6.
SSB. Indication of the SSB factory ID (= 12nc). (*)
7.
NVM. The NVM software version no.
8.
Flash Data. PQ (picture quality) and AQ (audio quality) data version. This is a
sub set of the main SW.
9.
DISPLAY. Indication of the display ID (=12 nc).
10.
TUNER. Indicates the tuner signal condition: “Weak” when signal falls below
threshold value, “Medium” when signal is at mid-range, and “Strong” when signal
falls above threshold value.
11.
SYSTEM. Gives information about the video system of the selected transmitter
(PAL/SECAM/NTSC).
12.
SOUND. Gives information about the audio system of the selected transmitter
(MONO/STEREO/NICAM).
13.
HDAU. HDMI audio stream detection. “YES” means audio stream detected. “NO”
means no audio stream present. Only
displayed when HDMI source is selected.
14.
FORMAT. Gives information about the video format of the selected transmitter
(480i/480p/720p/1080i).
15.
DFR SW ID. Referring to bolt-on SW ID.
16.
FPGA FW. Only applicable to sets with an FPGA.
17.
Reserved.
18.
Reserved.
If
an NVM IC is replaced or initialised, the Model Number, Serial Number, and SSB
Code Number must be re-written to the NVM. ComPair will foresee in a
possibility to do this.
How to Exit
To
exit CSM, use one of the following methods:
•
Press the MENU button twice, or POWER button on the remote control transmitter.
•
Press the POWER button on the television set.
Digital
Customer Service Mode (DCSM)
This
section only applies to sets where the Digital bolt-on Module is mounted
(China: CTNs ending with “D/93”).
Purpose
The
Digital Customer Service Mode shows how the Digital Module performs.
How to Activate
To
activate DCSM:
1.
Put the set in “digital mode”.
2.
Press “digital MENU” key on RC.
3.
Press “123654” key sequence on RC (do not allow the display to time out between
entries while keying the sequence).
How to Exit
To
exit DCSM, press “digital MENU” key on RC.
Error Codes
Error
codes are required to indicate failures in the TV set. In principle a unique
error code is available for every:
•
Activated protection.
•
Failing I2C device.
•
General I2C error.
•
SDRAM failure.
The
last errors, stored in the NVM, are shown in the Service menu’s. This is called
the error buffer.
The
error code buffer contains all errors detected since the last time the buffer
was erased. The buffer is written from left to right. When an error occurs that
is not yet in the error code buffer, it is displayed at the left side and all
other errors shift one position to the right.
An
error will be added to the buffer if this error differs from any error in the
buffer. The last found error is displayed on the left.
An
error with a designated error code may never lead to a deadlock situation. This
means that it must always be diagnosable (e.g. error buffer via OSD or blinking
LED procedure, ComPair to read from the NVM).
In
case a failure identified by an error code automatically results in other error
codes (cause and effect), only the error code of the MAIN failure is displayed.
Example:
In case of a failure of the I2C bus (CAUSE), the error code for a “General I2C
failure” and “Protection errors” is displayed. The error codes for the single
devices (EFFECT) is not displayed. All error codes are stored in the same error
buffer (TV’s NVM) except when the NVM itself is defective.
How to Read the Error Buffer
You
can read the error buffer in 3 ways:
•
On screen via the SAM/SDM/CSM (if you have a picture).
Example:
–
ERROR: 0 0 0 0 0: No errors detected
–
ERROR: 6 0 0 0 0: Error code 6 is the last and only detected error
–
ERROR: 9 6 0 0 0: Error code 6 was detected first and error code 9 is the last
detected (newest) error
•
Via the blinking LED procedure (when you have no picture). See “The Blinking
LED Procedure”.
•
Via ComPair.
Error Codes
In
case of non-intermittent faults, write down the errors present in the error
buffer and clear the error buffer before you begin the repair. This ensures
that old error codes are no longer present.
If
possible, check the entire contents of the error buffer. In some situations, an
error code is only the result of another error and not the actual cause of the
problem (for example, a fault in the protection detection circuitry can also
lead to a protection).
1.
Some of the error codes reported are depending on the option code
configurations.
2.
This error means: no I2C device is responding to the particular I2C bus.
Possible causes: SCL/SDA shorted to GND, SCL shorted to SDA, or SCL/SDA open
(at uP pin).
The
internal bus of the Trident platform should not cause the entire system to halt
as such an error can be reported.
How
to Clear the Error Buffer
The
error code buffer is cleared in the following cases:
•
By using the CLEAR command in the SAM menu:
–
To enter SAM, press the following key sequence on the remote control
transmitter: “062596” directly followed by the OSD/STATUS/INFO/i+ button (do
not allow the display to time out between entries while keying the sequence).
–
Make sure the menu item CLEAR is selected. Use the MENU UP/DOWN buttons, if
necessary.
–
Press the MENU RIGHT button to clear the error buffer. The text on the right
side of the “CLEAR” line will change from “CLEAR?” to “CLEARED”
•
If the contents of the error buffer have not changed for 50 hours, the error
buffer resets automatically.
Note:
If you exit SAM by disconnecting the mains from the television set, the error
buffer is not reset.
The Blinking LED Procedure
The
software is capable of identifying different kinds of errors. Because it is
possible that more than one error can occur over time, an error buffer is
available, which is capable of storing the last five errors that occurred. This
is useful if the OSD is not working properly.
Errors
can also be displayed by the blinking LED procedure.
The
method is to repeatedly let the front LED pulse with as many pulses as the
error code number, followed by a period of 1.5 seconds in which the LED is
“off”. Then this sequence is repeated.
Example
(1): error code 4 will result in four times the sequence LED “on” for 0.25
seconds / LED “off” for 0.25 seconds. After this sequence, the LED will be
“off” for 1.5 seconds. Any RC5 command terminates the sequence. Error code LED
blinking is in red colour.
Example
(2): the content of the error buffer is “1 2 9 6 0 0”
After
entering SDM, the following occurs:
•
1 long blinks of 5 seconds to start the sequence,
•
12 short blinks followed by a pause of 1.5 seconds,
•
9 short blinks followed by a pause of 1.5 seconds,
•
6 short blinks followed by a pause of 1.5 seconds,
•
1 long blink of 1.5 seconds to finish the sequence,
•
The sequence starts again with 12 short blinks.
Displaying the Entire Error Buffer
Additionally,
the entire error buffer is displayed when Service Mode “SDM” is entered. In
case the TV set is in protection or Stand-by: The blinking LED procedure
sequence (as in SDMmode in normal operation) must be triggered by the following
RC sequence: “MUTE” “062500” “OK”. In
order to avoid confusion with RC5 signal reception blinking, this blinking
procedure is terminated when a RC5 command is received.
To
erase the error buffer, the RC command “MUTE” “062599 “OK” can be used.
Power supply circuit diagram
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