日本語
Hello,
We have some all-SMD, FR4 PCBs which comprise LEDs and Driver components, or some PCBs which have just driver components. These PCBs are either double sided or 4 layer. They are 1.6mm in thickness. The components range from D2PAK FETs down to 0402 resistors, and 4mm by 4mm SMD LEDs.
We are sometimes finding that these PCBs, when delivered to us, don't work because of dry-jointed LEDs or other components.
We find this out because we can often make PCBs work by simply 'dunking' on/near the component pads with a big , wetted soldering iron.
However, we really need a better way to reflow these SMD components. Do you believe a hot-plate would be best?, or some kind of little SMD oven?, or an IR oven?
Sometimes the dry-jointed components have connection to a thermal copper pour on the PCB bottom. -But sometimes this is not the case.
We are actually wondering if the best & quickest way of doing it could be to simply put the PCB on a cheap hot-plate and waft over the suspect dry-joint components with a "gas gun" soldering tool?..(blowing scorching hot air on the suspect components)
- Comments(1)
A****min
Oct 26.2019, 10:46:09
These are certainly not dry joints. I's either tombstoning, pads under the parts not making connection because of wrong amount of solder paste or faulty components which become alive when heated. Tombstoning may happen because of incorrect pad layout, amount of solder paste or inferior reflow profile.
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