9
3.3. Side Board(s)
3.3.1.
Keypads
The keypads
(17TK15, 16, 17, 20, 21, 26)
for 17MB18 main board are listed in the Table below. (They have the same
connector pinning though):
Key Name
Type
Function
21
Power
Soft sw.
Power shut-down and turn on
X
Stand-by
Tact sw.
Switch between stand-by and turn on modes.
-
TV/AV
Tact sw.
Input source select button.
X
Menu
Tact sw.
Display main menu on the screen. If any menu is
active, display the upper menu. If main menu is
active, turn menu off.
X
Program-
Tact sw.
Go to the lower program at any time in TV mode.
In menu mode, go to down menu item.
X
Tact sw.
Go to the upper program at any time in TV mode.
In menu mode, go to up menu item.
X
Volume -
Tact sw.
Decrease the volume level in the volume. In menu
mode, go to left menu item.
X
Tact sw.
Increase the volume level in the volume. In menu
mode, go to right menu item.
X
Connector PL1 on keypads (connected to the connector PL175 on the main board):
Pin No:
Name
Pin No:
Name:
1
6
2
Volume-
7
Program-
3
Ground
8
Menu
4
Not Connected*
9
TV/AV
5
Ground
10
Stand-by/Shut-down
*Reserved: It can be +5V in the future designs if needed.
3.3.2.
IR&Led Board
IR&LED board contains LED indicator(s) to show TV’s status (Red for stand-by, green for normal operation) and one IR
receiver to get remote control instructions. All the IR&LED boards have the same circuit and connector pinning but the
different mechanical structure to fit different cabinets (see the related section for schematics and connector pinning).
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