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As an example, the detection solution adaptes to the relevant MSTAR Motherboard:

The solution MST9E19:

When TV is in the stand-by state, the 6th foot of CON4 in the power board MLT668 outputs directly 5V voltage to the system main board. At this time, the power indicator will light on the front of the shell (usually in red).Press the «standby» button when the TV needs to enter into the starting state, then the red power indicator on the front shell should flash a while and then turn into «green light», which indicates that the program of motherboard has started normally now. The control pin «STB-H»  in the motherboard outputs HI voltage to the power supply board (eg MLT668) , then the power supply board starts 12V & 24V voltage to control the audio circuit and high-voltage board circuits, meanwhile, the control pins «5V-BK» (or BL-SW ) and «AD» (or BL-ADJ) in the motherboard MST9E19 are the high pressure backlit panel controlled by High. While the screen backlight circuit starts, the CN10 pin in the motherboard MST9E19 outputs voltage, typically which is 5VDC (has 12VDC or 3.3VDC too), and is connected to the logic board by the screen line (in general, the «red» line is the voltage output pin in the screen lead wire.).

Particular attention must be paid to the power supply voltage from the logic board of the screen, to avoid that the incongruent voltage leads the screen to be damaged, dark screen or blank screen.

For details, please refer to the parameters for different types of panels.

The solution MST9E89:

When you click the «standby» button with ON, the red power indicator on the front cabinet should flash, and then the «green light» will illume, which indicates that the program of the motherboard starts normally now. After the mother board starts, the 5th foot control pin «STB -H » of the CON14 in the motherboard outputs voltage to the power board, then the power supply board starts 12V & 24V voltage to control the audio circuit and high-voltage board circuits, the and the CON2 in the motherboard outputs » ON «(or BL-SW) and the voltage pin » AD «(or BL-ADJ) outputs High to the high voltage backlight. Meanwhile, the pin CON6 in the motherboard MST9E89 outputs voltage (typically 12VDC) and is connected to the logic board of LCD screen by the screen line (in general, the «red» line is the voltage output pin in the screen lead wire.).

Particular attention must be paid to the power supply voltage from the logic board of the screen, to avoid that the incongruent voltage leads the screen to be damaged, dark screen or blank screen.

For details, please refer to the parameters for different types of panels.

If it is confirmed that the fault locates on the motherboard, please do not remove or replace the major components privately without the consent of our after-service staff. You may apply for the replacement for the new board to our after-sales Division, and we will arrange the repair for the defective products uniformly.

At present, the “factory setting” code of TV sets produced by Express Luck is the default value “MENU 1147”, which is different with the earlier main board project. For example, the code of MST9EX9 main board project is MENU 9257, the code of MST608DMBT main board project is SOURCE 2580, the code of ST309BT-DMBT main board project is MENU 2580. Please mind the following:

  1. The “factory setting” is the specialized item for R&D personnel and quality inspectors to detect and adjust. There is no need to adjust it once again for it is already in the best condition. So, no adjustment is allowed unless by professional maintenance technicians in case of leading to other negative phenomenon.
  2. If relative items needed to adjust, record the original parameters of these relative items beforehand. Remember to adjust to the original parameters if the adjustment failed.
  3. If adjustment disorder or failure happens, the product can return to the initial condition of menu by operating “reset” item.

1. Keep the model and the specification of the new material in accordance with these of previous material. If the panel is replaced by a new one with different model, the relative parameters, voltage requirements and resolution should be clearly understood. Attention：Panels in different model and specification are corresponded with voltage. For specific information, please refer to the sheet of panel voltage of panel T-CON.

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2. When replacing the main board, only the main board in the same model and same production batch can be used. If using the main board in different model and different production batch, first should be clear whether the parameter is in accordance with the panel or not. Meanwhile, pay attention to whether the voltage that panel T-CON needs is in accordance with the output voltage of main board’s LVDS VCC. Remember that the panel will be damaged when the voltage of LVDS VCC is much too high, and the T-CON board cannot work when the voltage is too low.

3. When using the main board of different model or different patch for replacing, the modification and adjustment of relative panel parameters should be clearly understood. Relative items can be properly adjusted in the “factory initial setting”. If failed to do so, software upgrading is needed to meet the requirements of panel parameter.

Replacing panel, glass, main board or shielded wire must be accompanied by appointed technical service staff.

4. When using the main board of different model or different patch for replacing, the modification and adjustment of relative panel parameters should be clearly understood. Relative items can be properly adjusted in the “factory initial setting”. If failed to do so, software upgrading is needed to meet the requirements of panel parameter.

5. Please mind electrostatic protective measures: avoidance of static electricity damaging panel components or IC and other sensitive and vulnerable components is the issue that maintenance instructors should pay attention to.

  1. Please avoid throwing, falling and wetting of the remote. Keep the surface and the battery of the remote clean.
  2. Try to avoid children playing with remote for the frequently start will shorten the lifetime of remote and television.
  3. Never wipe the surface of remote with solvent or potent chemicals. If there is slight dust, wipe it lightly with clean and soft cloth or cotton yarn. If the dirt in surface is too heavy, remove it with clean and soft cloth or cotton yarn which has dipped in neutral detergent, then let it air-dry.
  4. If the battery drops down from the remote accidentally and needs to put back in place or needs to change the battery, please be clear with polarity of battery and make it in accordance with the polarity in battery compartment, and avoid the phenomenon of remote or battery burnt even battery explosion caused by reverse installation of battery.

The motherboard with the FLASH ROM storage procedures, which can be repeatedly erased, can be pre-recorded the software to the FLASH IC, and then load it to the appropriate location of the motherboard, or can be upgraded the software via a VGA port or a USB port. Procedures are related to the functions of the motherboard, that’s to say, the motherboard with different functions or different solutions should be recorded with the different versions of the programs. In general, directly upgrading the software through the USB port is the most simple and efficient method.

Take the motherboard solution MSTAR 6M181, 6M182 and 18VG as examples.

Regarding those upgrading procedures and upgrading precautions, see the following, and directly upgrade the TV software via USB port :

  1. Copy a new software in a USB disk, and then plug the USB disk into the TV’s USB port;
  2. Then connect the power supply to make the TV with «red light» on (Note: Just let the TV standby, but do not switch on). About 2 seconds later, you should find that the light will automatically enter the slow flashing; A few seconds later, the indicator light will change the state into «flashing» from blinking slowly, and finally stop flashing and change back to the “red light” status (which indicates the upgrading is ended, and you can unplug the USB disk).
  3. Turn off the TV power supply, then turn it on, and the upgrading operation will be completed.

Please Note:

  • When the indicator is in blinking, it means that the upgrading process has been entered. At this time, do not power off;
  • When the indicator light changes the state into «flashing» from blinking slowly, it means that the upgrading process will be completed quickly. Please wait for a while, until the indicator light stops blinking.
  • The quality for U disk used for upgrading software must be good, and it cannot have virus documents or other documents;
  • If the new software “Bin file” is inside the RAR compressed file, then firstly you must unzip the corresponding the software Bin file from the pressure package, then copy the new software Bin file to the U disk directly;
  • The name of the Software Bin file cannot be changed, otherwise the upgrading operation cannot go on!

Option 1: Upgrading User Menu

  • Please copy the new software to the USB;
  • Power ON the TV and then link the USB to the USB port；
  • Press MENU to display the main menu. Then press /  to the OPTION menu；
  • Select the software in the root of your USB memory;
  • Press ENTER, then press to update;
  • After finishing the above steps, the screen will be black, then the indicator will be turned to red color, which means all the operation is finished.

Option 2：Upgrading By Powering On

  • Please copy the new software to the USB, link it to the USB port of TV;
  • Re-power on, if the LED blinks continually, it means the upgrading is on processing;
  • When the LED light is off, it means the upgrading has been completed.

Remarks：

  1. Do not turn OFF the power during the upgrading；
  2. The USB devices should be without computer virus or other files inside;
  3. If the new software is put in a RAR package, you must decompress the software from the RAR package；
  4. The new software name below (cannot be changed): bin_6m181.bin；bin_6m182.bin；bin_6m182_VG.bin;
  5. When upgrading, the LED blinks slowly every 1 second：
  • If upgrade succeeds, the LED will blink quickly every 1/4 second；
  • If upgrade fails, the red LED will light for a long time and green LED will light for a short time in cycle；
  1. After upgrading the software, you had better enter the default menu to resume as follows:
  • Press the remote control and enter the password “MENU1147”, now the TV will display with “Factory Setting”；
  • Select the option “INIT TV”, and then press on the remote control to reset it.

  1. Safety Warning:
  • The inside key components in the LED TV must be offered and replaced by qualified and appointed manufacturer. Otherwise it may generate electric shocks, fires or other important unsafety cases;
  • Don’t try to change the circuits without authorized permission;
  • Ensure to study the maintenance and service manual thoroughly before doing any of the maintaining actions.
  1. High Voltage Warning:
  • Please be highly noted the high voltages in the circuit.
  1. Electric shocks and Fires Warning:
  • Connect the insulate transformer between the AC current to the LED TV before repairing the panel;
  • Take care of the Soldering Pad related to the high voltage circuit. When there occurs short-circuit case, please replace the overheated components in time;
  • All protective equipment must be re-installed according to the original design;
  • Check the rosin joints, stack welds and the insulations, ensure there is no objection attached.
  1. Antistatic Warning:
  • The inner circuit boards in the LED TV are sensitive to the statics. Please take care of the ESD protection when replace the circuit boards;
  • The circuit boards must be packed by antistatic bags. Please wear antistatic ring and gloves when during repairing works.
  1. Attention:
  • LVDSVDD – If the LED TV is in 5V, it must be switched to the setting of 5V; If the LED TV is in 12V, it must be switched to the setting of 12V.

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