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Thread: EBY 701, mainboard troubleshooting help!

  1. #1
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    Unhappy EBY 701, mainboard troubleshooting help!

    I've been working on this project for over 3 months now (could have been done in under 1 week if all went smoothly. )

    I'm doing a custom enclosure to level the screen with the dash bezel.
    So far I've broken:
    The front bezel (bought another for $15)
    The touchscreen (bought another for $35)
    The new touchscreen (it was for the old 701, tried soldering onto the ribbon cable; bought correct for ($35)
    The LCD 40 pin ribbon cable connection (bought another screen for $45)
    The 40 pin cable (bought another for $5)

    So far I'm up to $135 on this project that could have been free.

    Now, as far as what I have, and what problem I'm having:
    The LCD, touchscreen, 40 pin ribbon cable, and front bezel (with switches) are all brand new.

    With the first LCD, where I broke the 40 pin connector, I could manually hold the cable in, and if held very precisely in the correct location, I could get it to work.

    I took my chances, and soldered the 40 pin cable directly to the LCD board, I triple checked each and every solder joint to be tight and also checked to make sure no points were bridged. I plugged it all in, and that's when absolutely nothing came up, just black. Not even the back light.

    Now being that the touchscreen still works, and I still get the windows "hardware inserted" noise, I made a logical guess that it was time to bite my lip, and fork out the money for the new LCD & cable. I was so excited when it came in! Put everything together, and NOTHING. Just the windows noise and a working touchscreen. No LCD. After getting myself back together, I tried taking it all apart and moving the cables around, and tried again, nothing. Tried again, nothing. Tried a 4th time, nothing...

    Is there a chance my main control board is partially fried? Any cheap fixes besides buying a new control board (Making my list of items individually bought be a complete screen assembly? )
    I can still switch the inputs, the side buttons still work, touchscreen still works, just no LCD display!

    Thanks for any insight.
    This project has had me depressed for far too long.
    -Tim

  2. #2
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    I verified that the motherboards on-board vga is in fact outputting a video signal. (Used a known working LCD screen.)

    I also tested to see if it would show anything in the AV inputs, sound works! But the screen stays black as night.

    Hope this helps narrow it down?

    Any help?
    Anyone?

  3. #3
    Maximum Bitrate tft_lcd_org's Avatar
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    Let me get this right, you took the 40 pin ffc cable and soldered it to the LCD controller board?

    Why??

    There is a locking tab on the connector that holds the ribbon securely. If you bought a new LCD, I am guessing that lock tab is good?

    I don't see how you could have soldered the ribbon to the board without melting it into a giant mess anyway, given how thin the pins are.

    Please post pictures.

    Thank you

  4. #4
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    The original plastic connector was broken, I tried various posted fixes on it, but no luck.
    Figured I'd try this as a last resort.

    IT ENDED UP BEING THE CONTROL BOARD.

    I chatted with Chris from Mobile Computing Solutions, and he said he's seen it before, but no clue what causes it.

    Fixed! Just have to get the auto power on to work now! (The code isn't bringing up the menu, and yes it's in PC mode with a live image feed.)

  5. #5
    Maximum Bitrate tft_lcd_org's Avatar
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    After looking at your pictures, and re-reading this part of your first post :

    "I took my chances, and soldered the 40 pin cable directly to the LCD board, I triple checked each and every solder joint to be tight and also checked to make sure no points were bridged. I plugged it all in, and that's when absolutely nothing came up, just black. Not even the back light."

    It is obvious that you fired the controller with the poor solder job.There are several places where pins are soldered together, including power to ground, etc.

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