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The machine keyboard circuit (i.e., K plates) is a plastic film circuit, which consists of S001 ~ S013 thirteen micro switch, RO () 2 ~ R014 thirteen resistor (see Figure 1), Q and K plate connected plate line (see Figure 2), Q and R board plate (Fig. 3) of the connection components. Which, s001 ~ s013 folded together by a plastic film. The main causes of the failure, there are two: First, the keyboard circuit box in the keyboard, the keyboard box and installed in the bottom of the TV cabinet, and promote the use of the keyboard case, keyboard case automatically pop up later pushed into, then self lock. Over time, the connection due to wear plastic film on the lead circuit (if a fault occurs on the socket to connect Q2 R between the plates, used fine wires); Second, the plastic film circuit elements and wiring aging deterioration, causing malfunction .368service manual download site
Since the special keyboard circuit can not buy, for maintenance work has brought some difficulties. Here are a few faults and solutions.368service manual download site
Example l: remote failure (R board components normal), keyboard dysfunction. Press the volume key changes in program number, press the program key or keys are preset volume changes occur, not preset programs.368service manual download site
This fault is a Q plate and K plate, Q and R plate connection plate while bad cause, the solution is: Reconnect these connections and making K board to allow the keyboard to normal.368service manual download site
Connection must pass through the keyboard box, but too much will increase the connection pop-propelled friction, and thus the connection possible. The first plate K R013, R014 respectively welded between plate ¢Ú Q Q1 socket, ¢Ý feet and ¢Û, ¢Ý feet, this can be omitted Q2 5V power socket to the new connection between the plate K, Q panels to between the new K board, are just three wires to complete the connection between the Q board to R board.368service manual download site
Remove the plate Q2 Q and R socket board feet ¢â ¢à pin socket R1, make these two holes for welded connections. Hauled K board abandoned the original keyboard box.
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