Sega Genesis VA2 Board Rev. SMD Component Replacement

Discussion in 'Repair, Restoration, Conservation and Preservation' started by DHeth, Aug 21, 2016.

  1. DHeth

    DHeth Member

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    I have a Sega Genesis VA2 Board Rev. that outputs garbled video, sound is fine.

    https://goo.gl/photos/JxpuiPovkzVbCTSU7

    I tested both the AV out and RF out, tried different game carts, different power supplies, all with the same results. I cleaned the cartridge connector and looked for bent pins but it appeared to be in excellent shape.

    My next step was to look inside for bad solder joints when I discovered this :https://goo.gl/photos/oqYceUjPzATbUrmy8

    the small (light beige) ceramic component in the picture. It appears to be chipped in half, or blown do apart ? can these components explode?

    (zoomed out) https://goo.gl/photos/z4nwXXsQkXuBfdKj6

    It think it is a surface mount ceramic capacitor but I'm not sure. I'm hoping replacing this part fixes it , however I can't identify it to know the specifications to buy a replacement part.

    I'm very new to console repair and have never done surface mount soldering before (just leaded through-hole components) . Currently I have a 40W iron and .6 MM 60/40 Solder, would solder paste and a heat gun be better ?

    Also any recommendations on flux, right now I have a cheap flux pen and it is pretty terrible.

    DHeth
     
  2. DHeth

    DHeth Member

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  3. Ronnie

    Ronnie Spirited Member

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    Last edited: Aug 21, 2016
  4. DHeth

    DHeth Member

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    I'm still pretty green and even more so about schematics. What is a capacitor going to look like or be labeled as on one of those schematics.
    Two lines parallel to each -||- other and a curved line for polarity? + -|(- - ?
     
  5. Ronnie

    Ronnie Spirited Member

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    Those cer caps are non-polar, so it will look like -II- .
    I'm in the middle of a project but If you give me about a week or two I may be able to dig my VA2 and help you out.

    Anybody else, please feel free to jump in :D
     
  6. DHeth

    DHeth Member

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    Yeah, i'm in no rush, it has been sitting on the shelf for a while and I had some spare time to look at it.

    The majority of the non polarized I see on those schematics are 33pf or 100pf and the max voltage in a Genesis is going to be is 5V ?

    so if I got a ceramic capacitor rated for 10V or more and 100pf I should be ok?

    What happens if I put a 100pf to replace a 33pf , it would just draw a little more on power up to charge the capacitor ?
     
  7. DHeth

    DHeth Member

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    I went to Dave Jones EEVBLOG forum to try and figure out the capicatance. It can be measured with a multimeter on the FCx setting unfortunately my Autoranging multimeter doesn't have that setting. So i'll have to put it on hold until I can pick up a meter capable of that.
     
sonicdude10
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