The author explains and defines the definition of each foot by disassembling and measuring the MMI line of the beautiful US TV box.
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The MMI line of this good beauty TV box is a kind of extension cable for the connection of external audio and video signals and TV box. One end is a mini 12-pin flat plug, and the other end is three lotus and one S terminal. The female plugs correspond to the input of composite video, left and right audio and S video respectively. Many model parts of Jiamei TV Box products are equipped with MMI expansion ports, but there is no corresponding MMI cable, such as “Good Beauty†TV-3288/3288A/3388/3388A/3388AR, etc., if AV input function is required. These models of TV boxes require an optional MMI cable. Because the interface is special and the dealer may not always have the accessory, it causes a lot of trouble for the user. The author below disassembles and measures the MMI line of the good beauty TV5688 TV box. The definition of each foot of the MMI terminal (above) is as follows:
In fact, the 12 pins of the MMI terminal only use 7 pins. The rest of the positions are empty feet. There is no contact spring. The side with the contact spring is facing up. The left to right pins are defined as empty feet. Not calculated):
1. Y-end of composite video and S-terminal (two signal wires are welded together)
2. S end of the C end
3. Right channel (red)
4. Left channel (white)
5. Ground
6. Ground
7. In the specific production, find a 1.5mm thick copper plate, cut into 13.5 × 25mm, and divide it into 1mm at 13.5mm with a knife to divide into 12 thin strips, with elastic thin copper wire (can be RJ-45 network straight through the socket), take about 10mm long, the front end is curved into an arc, and the rear end is welded to the corresponding position of the copper plate, see the figure below.
Then connect the corresponding pins of the soldered copper plate to the audio, video and S-side sockets. In actual production, you can also leave the appropriate area behind the copper-clad board that makes the MMI socket, and directly solder the audio, video and S-terminal sockets on the same board. The author believes that this solution using MMI socket has a big advantage in reducing the volume of the whole machine, and there are big disadvantages in signal loss, ease of use and versatility between the transfer and the line. Please ask the manufacturer. Consider it.
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