Are These Bad Solder Joints?

[npalen]

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

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?

 

[mcphipps]

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.

 

[Fplvert]

HOW TO: Removing/Replacing your WiFi Module
Probably best to replace.

 

[npalen]

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.

 

[mcphipps]

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.

 

[LuvMyTJ]

What is the black line in the circle?

 

[npalen]

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.

 

[npalen]

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

 

[N017RW]

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.

Lint would not survive reflow.

Dull appearance is one indicator of lead-free solder.

 

[myeyecu]

I believe its the lead free solder.