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  1. #1

    1997 Polaris SLT 780 "Need MFD!" and any other info

    Hey everybody, I'm rebuilding a pair of 97 SLT 780's. One of my displays is dimmed an i will try the fix i found in other posts to bring that back to life but i have one MFD that i cut open and it had Exploded chips all over the Water strike Circuit board inside the unit. So i have a perfectly good bright screen and insert but my board is fried. I am looking for an entire MFD unit or just the board. If somebody has one that would be great. Even if the screen is cracked i can still use it and just take out the board inside and put it in my unit with my screen. I have been searching the internet for this part but people want entirely to much money for a part that is from 1997. The few i found have been priced at $100+ and i feel like that is crazy since i bought the skis as a pair with the trailer for $500. This is just a fun project for me i'm not looking to spend thousands repairing old skis. I would just like to see them both in good running condition to have some fun with. Carb rebuild kids are in the mail . Also if anybody has any key information for these models like cheap or DIY performance upgrades (i'm not scared to take a dremel to anything i own) i'm all ears!

    Thanks in advanced
    Joe


  2. #2
    Click avatar for tech links/info K447's Avatar
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    Good working condition MFD are not inexpensive. I have a working unit that needs a good front panel (working buttons).

    If you want to send your exploded unit to me I can try to repair it. PM me if you want to proceed.

  3. #3
    Do you know where i could find a cheap MFD?. The buttons and screen on mine work fine the main board is shot. It has chips on it that are exploded. If i could find just the board itself i could seal it up and have a working MFD. I can post you pictures of the board to see if you think its worth even trying to fix.

  4. #4
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by Sonix View Post
    Do you know where i could find a cheap MFD?. The buttons and screen on mine work fine the main board is shot. It has chips on it that are exploded. If i could find just the board itself i could seal it up and have a working MFD. I can post you pictures of the board to see if you think its worth even trying to fix.
    Post some clear photos here of the front panel situation.

    It is important that the repaired MFD be 100% watertight afterwards or it will not last long. The front panel buttons are fragile, as are the ribbon wires right behind the buttons.

  5. #5
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ID:	364997So i applied the fix i found on the website for dim screens only because when my ski was running all the MDF did was blink. The clarity on the screen is perfect but when its running i don't get any readings at all. I thought it had something to do with the ski itself so i took the display off my other ski and swapped it out and it works perfectly on both skis so i'm sure its this display. On the board you can see the square brown chip is damaged. That might not be the only problem with the board but i'm fairly sure the unit would work perfectly if i had another board to put in it.

  6. #6
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by Sonix View Post
    Click image for larger version. 

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ID:	364993Click image for larger version. 

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ID:	364997So i applied the fix i found on the website for dim screens only because when my ski was running all the MDF did was blink. The clarity on the screen is perfect but when its running i don't get any readings at all. I thought it had something to do with the ski itself so i took the display off my other ski and swapped it out and it works perfectly on both skis so i'm sure its this display. On the board you can see the square brown chip is damaged. That might not be the only problem with the board but i'm fairly sure the unit would work perfectly if i had another board to put in it.
    I have a board. I have an entire MFD that just needs a front clear plastic panel with working buttons.

    The board is effectively the core of the unit. A non-functioning circuit board means what remains is a just plastic shell and the front panel.

  7. #7
    Well i'm fairly sure if i have the working board i can get the unit to work. When the ski was off the clock and options came up perfectly on the display after i cleaned the contacts using the guide from this website but like i said it just blinks like crazy when the ski is on. It's obvious to me that the board is dead . Would you be looking to sell of the board so i can try fixing mine or are you trying to make a working unit yourself for a ski you own?

  8. #8
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    Is the red part the only damaged component?

  9. #9
    It's the only "Obvious" part to me that's broken but the other chips could be damaged too. The unit seems to work when the ski is off the clock displays perfect. however, once the ski is running the entire display blinks like crazy almost like its getting surged with power. I tested this ski with another MFD on it to make sure everything from the MFD back was working and it all checked out. I was talking back and for with User K447 and he may have the board that i need but no reply yet on what he would like to do. I'm fairly positive if i can get my hands on a replacement board i can fix the unit.

  10. #10
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    There's nothing else to it besides the board.

    My guess is that that is a simple capacitor or coil that is meant to clean up the pulsing DC the ski provides.

    If possible, it would be interesting to try powering the MFD off of a 12V battery that is not connected to the ski electrical system but still have the rest of the signals coming in to the MFD. You'd have to make up some y cables to manage that though.

    Does it still go nuts if the gray lead to the MFD is disconnected at the electrical box?

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