The change of the keypad will encounter both bus and line selection. The line selection modification scheme is relatively simple, and only needs to adjust the line sequence, and the corresponding function keys of the universal board are correspondingly matched with the function buttons of the original machine key board. If the keypad is a seven-key, the universal board is a five-button, you can give up the left and right buttons; if the keypad is a six-button. The universal board is a five-button, you can give up the AUTO button; if the keypad is a four-button. The universal board is a five-button, and you can give up the EXIT button.
Bus type
It is relatively troublesome to change the Samsung and LG monitors using the bus type.
Because there is no LCD program for the bus driver board in the hands of maintenance, if these programs are simple, there is no need to change the button board. When using the general 2013, 2013, and 2621 changes, it is necessary to increase the connection cost between the keypad and the driver board, and ensure that each button switch is connected to the corresponding pins of the driver board one by one.
Samsung is a six-button single-lamp solution that requires eight wires: LG is a five-button dual-light solution. Eight lines are also needed. When changing the bus type to line selection, be careful to remove the voltage divider resistor, otherwise the button will be invalid.
2. Line selection
Because most of the universal driver boards are line-selectable, only one-to-one connection is sufficient.
When changing the board, there will always be problems with the connection between the universal drive board and the original keypad. The original keypad is often used with the connector. These connectors are of course not connected to the universal board.
(1) ordinary four-button, five-key, seven-key board
1) DELL LCD 4 button DELL LCD multi-use four-button solution, the GM2621-LF free drive board should be used when changing the board, because the OSD menu adjustment only needs MENU and LEFT, RIGHT three keys to complete. The 2025, 2023, RM3331 and other boards require four keys to complete the adjustment.
2) HP, Lenovo five-key board Such machines can use 2025, 2023, RM3331, RM3451 and other boards because they have enough buttons to choose from. Which one to use depends on which board is easier to light the screen.
3) Philips and other seven-key board 2025, 2023 we use, although the program is marked with the five-key program, in fact, other buttons can also be used. Like AUTO, EXIT, MENU, LEFT, RIGHT can be used, which one to use, according to the number of buttons and definitions to determine.
(2) Samsung, LG bus type keypad
Samsung and LG use thin film buttons. When changing such machines, the film buttons must be uncovered. Remove the voltage divider resistance between the buttons, and then find the appropriate position to lead out the connection line (note: use a thin line, otherwise the film is not easy to paste back), then the corresponding connection can be.
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