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Are These Bad Solder Joints?

Discussion in 'General Discussion' started by npalen, Mar 8, 2016.

  1. npalen

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    The pic shows some typical solder joints on my PV2+ onboard WIFI card. I suspect that the board has overheated which is apparently a common problem that drops the video to the mobile device. I get video feedback for about 60 seconds when the bird is powered up cold a WIFI_1.jpg nd then it drops the video but still shows telemetry on the app.
    I notice that all the solder joints are a dull color as shown in the pic and wondering if that indicates bad connections. Shouldn't the solder be bright?
    Also wondering where I can find the circuit diagram of this WM301_WIFI_2G_V1 circuit card that is one of the two cards in the wifi module. Is it possible to repair the board by reflowing the solder using a home oven?
     
  2. mcphipps

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    I wish the image was a bit clearer.
    Do you see any cracks in the solder?
    Color usually is a reflection of the temp on the original solder joint.
    Doesn't always mean it is a bad joint or connection. Hairline cracks at the edges of the joints is pretty much a dead give away from my experience, usually caused by vibration of a cold joint.
     
  3. Fplvert

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  4. npalen

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    Here's another area of the board that shows what may appear to be cracks in a solder joint. I'm trying to avoid spending $200 on a new WIFI module so probably don't have much to lose in trying to reflow the solder. There are lots of youtube videos on reflowing solder.
    I would like to find the website where circuit board numbers can be searched. I believe it's from when the circuit board design is submitted for approval but can't remember the name of the electronics association that does the approvals. WIFI_2.jpg
     
  5. mcphipps

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    Well, you could try to re-flow the solder to shore up the cracks.
    If it don't work, you are still looking at replacing the board I think.
    But....if it works, easy fix.
     
  6. LuvMyTJ

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    What is the black line in the circle?

    WIFI_1.jpg
     
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  7. npalen

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    Can't see it with naked eye and the pic is shown with about 50X magnification. Maybe a piece of lint?

    Looks like it was embedded in the solder paste before flowing.
     
  8. npalen

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    Pics of the front and back of the WIFI board. Kinda blurry but wondering if anyone can identify the main wifi chip? board_1.jpg board_2.jpg
     
  9. N017RW

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    Lint would not survive reflow.

    Dull appearance is one indicator of lead-free solder.
     
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  10. myeyecu

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    I believe its the lead free solder.