Question about Computer Monitors

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Disconnected lcd from case but connectors came out need wiring di

I have a xerox xa7 19i lcd monitor and I had white out on start up.
I saw your thread on capacitor replacement and step by step dismantling instructions which looked like the answer to my problem.
I purchased the capacitors, and followed the instructions, but when lifting the lcd screen away from the casing the wire connectors pulled free before I could mark them for reassembly.
I need a wiring diagram or instructions as to which connectors connect to which ( There are four connectors each containing two different coloured wires on each side ).
Can anyone help me with this problem?

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  • 4 more comments 
  • buddha steve Dec 05, 2008

    Yes I am refering to the 4 connectors that connect the LCD screen to the power board.

    I can tell you that all the connectors are interchangeable and as they disconnected themselves as I lifted the LCD screen away from the case, I have no way of telling which should connect to which.

    I have changed the 6x470uf 25v and 1x220uf 25v capacitors but I daren't connect and start up the monitor for fear of damaging the unit.

    What I am requesting is either a wiring diagram preferably but not necessarily in colour or failing that a detailed description of which connectors connect to which by means of their position from top to bottom as they appear inside the unit.



    Many thanks,



    Steve Prior

  • buddha steve Dec 05, 2008

    sorry but the proview manual you kindly supplied is of no use.



    maybe I should give you a step by step rundown of what I did.



    I googled my monitor, reached your forum, and read the thread on white-out at start up, as this was the problem I was having.

    Rugauger, posted on 20th November, mentioned changing the capacitors as this had solved his problem and gave the link http://www.fixya.com/support/t145392-whi...



    having gone to this link, the second entry by Guest posted 19th July, gave a detailed run through of how to dismantle the monitor which was extremely valuable to me, I followed his instructions, but as you will see from instruction 5 in this run through, he says to mark the connectors so that it is possible to reconnect them after replacing the capacitors. Unfortunately, the wires are very short and when I lifted the LCD screen away, the connectors pulled free by themselves and I now don't know in what order to reconnect them.

    It is frustrating to think that having replaced the capacitors, I potentially have a working monitor but I cannot check this until I reconnect these wires and power up.

    For fear of damaging the board and or the LCD screen, I am reluctant to try connecting by trial and error so I am requesting the correct reconnection sequence.



    I hope this has clarified my requirement and I look forward to your reply.



    Steve Prior

  • buddha steve Dec 05, 2008

    Ok thanks, I am in an internet cafe at the moment (as obviously I have no monitor at home), so I will need to go home to obtain that information.

    I will post you the reply in about an hour.



    Many thanks,



    Steve Prior

  • buddha steve Dec 05, 2008

    Hello again,



    In response to your request, I have noted the numbers on the power board, although I don't know which it is so I include all numbers on the board.



    At the top of the board (printed onto the board) it says Mirage Electronics co ltd AD-1700 REV:F date 1,14,2005 200-000-1700TLi version: A+.



    In the middle of the board (again printed on the board itself and in this case in larger characters)

    E67640 94V-0.



    There is also a small white label on the board that reads; 860-AB0-190DTL1-A AD-190DTL1 J33-007 D 8132951



    I don't own a camera so I can't submit any photos of the board, however, should this prove to be necessary, I'm sure I can borrow one.



    Many thanks,



    Steve Prior

  • buddha steve Dec 06, 2008

    My mistake, sorry.

    The you tube video clip was very helpful as the board and capacitors shown were exactly the board I have. The poster said he didn't know if this was the invertor board or not but it seems from what you are saying that it is.

    If you watch the video clip, at the moment he removes the LCD screen, he shows the connectos and wires that I am having problems with. On the board they are all pink and white and from the LCD screen, two are pink and white and two are blue and black. each corner of the screen has 1 pink and white and 1 blue and black connector but all the board connectors are pink and white.

    Unfortunately, in the clip he just removes them all without saying which go where.

    again my appologies for the confusion but at least we are both on the same page now.

    If you could let me know which way these connectors go back together I can let you know if the caps solved the problem or if there is something else wrong.



    Many thanks for your patience and perseverance.



    Steve Prior

  • buddha steve Dec 08, 2008

    Hello again,

    I decided to connect the wires anyway, as if it wasn't the power board it would be unlikely to damage the unit. Hey presto I have a working monitor again so many thanks for your help.

    However, when I now switch on the monitor it goes black after a second or two and remains so. Switching the monitor off and on four or five times, results in the monitor staying on and therefore it is usable but obviously this isn't normal. Any ideas?



    Again thanks for the help,



    Steve Prior

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  • Computer Mon... Master
  • 19,396 Answers

You can connect the plugs only to the right connectors, I see if I have schematics for this CRT.

Posted on Dec 05, 2008

  • 4 more comments 
  • Ginko
    Ginko Dec 05, 2008

    I am sorry, I confused the model, I see this is a Xerox Tft, are you talking about the connectors to the power board?

  • Ginko
    Ginko Dec 05, 2008

    I found a service manual for a proview, that mounts dame power board and digital board, see here Untitled

    Connectors should be the same.

    I have part list for Xerox Xa7 series at home, but no schematics or diagrams.

    See if the service manual above can do.


  • Ginko
    Ginko Dec 05, 2008

    I can see , you replaced the caps on the power board, try giving me the power board part number, that is printed on top of the board or on a sticker.
    Schematics for the monitor are not available, I can see if I find the board diagram.

  • Ginko
    Ginko Dec 05, 2008

    Send me also some picture of the board, showing the connectors, and the connectors cables.

    If I am not online I usually answer within 24.

    Regarding the repair you should have tested the caps before replacing, or checked that they were bulged or burnt. Even if a blown capacitor is the most common, there are more components and problems that can give white screen on a TFT. Lets hope the caps can fix it.


  • Ginko
    Ginko Dec 05, 2008

    If this is your power board:



    (fromhttp://parts.discount-merchant.com/modim... )

    Then the connector at the left should have same voltages, you need to test connectors voltage out , if they are the same, use the connector that is nearer to the cable.

    I need to put this disclaimer for your information ad safety.To test voltages out you need to work with live power on, this operation should be performed by a qualified technician, observing all the safety rules.

    If you still get the problem after connecting the board, that means that the problem were not the capacitors, in that case I can tell you what to test.

    I am going offline soon, I will see if I can at least find schematics for the PSU board.

    Let me know if the part I was referring to is the same as your board, that is a PN: E67640 PSU board, used on different monitors and TVs.



  • Ginko
    Ginko Dec 05, 2008

    I have got the right part, but is not a power supply board, it is an inverter board. This is confusing me.

    860-AB0190DTL1-A AD-190DTL1



    The complete part code is : (
    MAG LT916s 900P Inverter Mirage Electronics AD-1700 Rev:F 200-000-170DTL1 VERSION:A

    Sticker: 860-AB0190DTL1-A AD-190DTL1 J22-001 A 5083725)

    If you had white screen with light , the inverter should be OK.

    When the inverter board is faulty you get no light, or light flickering, or dim light , or monitor turning off after few minutes, or wavy lines.

    The inverter is a variable high voltage power board , thet energizes the LCD backlight.

    When you get intense ligt eith no picture usually the inverter is fine, it is either the main board or the power board.

    Moreover the inverter should have only two connectors, and they are different.

    Let me know if you have replaced inverter caps or PSU caps.

    Watch this movies on disassembly a similar TFT, they may help.

    If you need to connect back the inverter, there should be no problem, if it is the power board, you should have same voltages on both connectors, the voltages must be tested before connecting it.




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