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Thread: Best way to trace pin outs.

  1. #1
    Maximum Bitrate TimmyM's Avatar
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    Best way to trace pin outs.

    I was given a no name, and I mean NO NAME, mobile DVD player with two monitors. The DVD player doesn't work. I wanted to use the two headrest monitors for the rear seats, run the video off of the video cards video out. The problem is finding the pin outs. There is a 9 pin cable going from the DVD player to each monitor that supplies power, audio, and video. I'm not going to use the audio part so all I need to determine is which is for power and video. I've taken the monitor apart doesn't have anything labeled. Also took apart the DVD player, even less labeled. So how would I go about determning which each pin is for?

    Like I said, this is a No Name setup. I can't find a manufactor's name anywhere so trying to track down a wiring digram isn't going to happen.

  2. #2
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    Yes, outside it is noname. But just open it.... on the panel there are singing numbers and identifyers

    The power and GND are quite easy, because usually the largest metal part is GND (the metal housing of the LCD, for example). Power is very often protected by a fuse (white, small smd brick, amperage is on the surface and marked as F1 on the pcb). It is possible that it is also filtered by a ferrite.

    First you have to determine, what is the system of the video. Inside the monitor, on the PCB there are white labels, eg. +12V, GND or so. Read them.
    Search especially for those small silver metal discs that are not covered by that insulatory green resin.

  3. #3
    Maximum Bitrate TimmyM's Avatar
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    I've opened it up and there are two boards inside. One has all the controls, Vol, Color, Brightness, Pwr, etc. Then there is the board on the LCD. Found a number on that, NO: PVS1960 V1.3 SS-1 94V-0 04/02/03 4204 E229342. Really don't think that will do much good because I have to use both boards. I don't need the pins for the second board. From the first board to the LCD are two sets of wires which are clearly marked on the main board. First set is TFT, GND, TFT V+9V, Video GND, and Video. The second set has Colour, Bright, CND, +5V, Screen and ON/OFF.

    THe case is plastic but the surrounding area of the plug is metal and I assumed as you did that that was the ground. I had also found the fuse so it should be easy to find those two. It's the video thats going to be a problem I think.

    I cut the end off the cable, it has yellow, Black, Green, Blue, Grey, White, Red and a thicker black wire which, when stripped looks like your standard RG6 TV cable but way smaller. I'm assuming this is probably video. Might also be an issue trying to sodder a connector on to that!
    Of course I've forgotten my OHM meter at the other house so I'm off to buy a new one.

    Thanks for the ideas,

    Tim

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    Maximum Bitrate TimmyM's Avatar
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    [IMG][/IMG]

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    Unfortunately, that photo is not clear enough to recognise anything...
    Tim, I think it is a simple LCD TV + some electronics, so video can be composite. Sound is independent and uses a small amplifier. When the sound is stereo, it is clearly visible by L and R markings on the PCB.

    Usually thick wires are power and ground, thinner is the control, shielded are signals, shieldings are gnds.

    GND
    +12V POWER
    enable on/off
    video
    video GND
    stereo L
    stereo R
    stereo GND

    So, 8 of 9 is identified. Internally, the grounds are common, so you need your ohmmeter. Sometimes the ground is doubled.
    It is also possible, the ninth wire is not connected at all.
    Would be good to know, what were the original functions of the monitors (e.g. brightness is controlled centrally or locally) that can reveal the function of the ninth wire...

  6. #6
    Maximum Bitrate TimmyM's Avatar
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    Thanks for the info. Sorry about the picture, it was a cell phone camera. I didn't have time to get another ohmeter yesterday so I'm going to the other house today to work on it. Most of my tools are there anyway.
    I've got a feeling most of the 9 wires are not being used. I'm thinking the only thing that are being sent is:

    GND
    +12V
    Video
    Video GND
    Audio
    Audio GND


    It's not stereo, there is only one tiny little speaker in the monitor. Volume, Colour, Brightness, ON/OFF are all controlled on the monitor it's self. I'm hoping that red and black are GND and +12V and the sheilded cable is Video GND and Video.

    Another question, I think I should be able to figure out GND and +12V easy enough. When I get that figured out would it hurt anything to strip some wire off a cable, hook it to a DVD player for signal then by process of elimination, connect that to the remaining wires until I find the correct ones? I wouldn't think it would hurt anything, it's just the video signal. Can't be a lot of voltage in that.

    Again, Thanks for the help.
    I'll let you know how it goes.

    Tim

  7. #7
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    The web is a miraculous thing. Just type 'pvs1960' (from the PCB) and it gives you a lot of sites. Seek them. I believe, the sound is stereo, but it is not used by the monitor. It is just a spare feature for the future.

    You can not hurt anything with the video signal. I also assume that, there is an enable signal that makes the monitor active.

  8. #8
    Maximum Bitrate TimmyM's Avatar
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    The PVS1960 is the second board, it's attached to the back of LCD. You can just see a little bit of it at the top of the picture. I really don't need the pin outs for that since they are clearly marked on the first board. I've circled them in the picture.

    I've made some progress. I've traced the cable and know the order of the plug. I've ID a most of the wires:

    Grey - V+
    Green - V-
    Red - Unknown
    Yellow - Unknown
    Blue - GND
    Black - Audio
    White - Audio

    Black shielded - video GND
    Black inner - Video

    I've put power to the Grey and Green wires and got the standby light to come on. I've connected the black shield/core to a DVD player but no picture. Hooked audio from the DVD player to the white/black and got sound. I'm stumped as to why I can't get the video. Not sure if the red and yellow have something to do with that or not.

  9. #9
    Maximum Bitrate TimmyM's Avatar
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    I did do a search on the PVS1960 and came up with the excact DVD player and monitors!

    http://www.gadgetmadness.com/archive...dvd_player.php

  10. #10
    Maximum Bitrate TimmyM's Avatar
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    Chick-a boom Baby! We've got video!!! I did a search for the PVS1960 and whole crap load of sites came up. Sounds like these are junk and break a lot. Found someone else who was trying to do the same thing as I am. I had one wire wrong, green was GND for the standby light, White was the actual GND for the monitor. Switched that around and I've got picture!

    Thanks for all the help, couldn't have done it with out it!

    Thanks,
    Tim

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