Homemade TV box dedicated MMI line ----- MMI Wire

Author: Guangxi Chen Qingfeng Through dismantling, the author is measured, the best-in-TV box MMI line is measured to illustrate the definition and production process of each pin. The MMI line of the author of the author is a transfer line for external sound, video signal and TV box. One end is a mini 12 pin flat plug, the other is three lotus and a S terminal The female plug, corresponding to the input of composite video, left and right audio, and S video. Many models in the US TV box products are set to have MMI expansion ports, but there is no configuration corresponding MMI cable, such as "Jia's beauty" TV-3288 / 3288A / 3388 / 3388A / 3388Ar, etc., if AV input function These models of TV boxes need to purchase MMI cables, because the interface is special and the dealers do not necessarily have this accessory, so many troubles have been brought to the user. The following author uses the MMI line (above) of the MMI terminal as follows: In fact, the 12-pin of the MMI terminal only uses a 7-pin, and the remaining positions are empty foot, no contact reed, the terminal with the contact of the reed, from left to right of the pin definition, respectively (empty foot Not calculated): 1. Composite video and S terminals of the S terminal (two signal line welded together) 2. S-terminal C-terminal 3. Right channel (red) 4. Left (white) 5. 6. 7. In the specific production, find a 1.5mm thick copper plate, cut into 13.5 × 25mm, and the interval between 13.5mm is separated into a 12 thin strip, with a flexible fine copper line (can The RJ-45 network straight-through socket is removed, takes about 10mm long, the front end is bent into a curved shape, and the rear end is welded to the corresponding position according to the copper plate, and is shown below. Then, the weld is then connected to the tone, video, and S-end outlets accordingly. In actual production, you can also leave the copper-copper produced by the MMI socket, and the sound, video, and S terminal socket are directly welded to the same plate. The author believes that this solution using the MMI socket has a large disadvantage in the transfer and the line signal loss, ease of use and versatility in the reduced machine. Consider.

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