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
