Receiver / Controller Stuck hard to PCB

[landed]

Has anyone had experience of removing the flight controller from the PCB board. After a crash I am replacing the PCB and the receiver is stuck to it. I don't want to add heat but it may help.
I secondarily wanted to ask if anyone has any links to the velcro double sided tape often used as I would like to afix the new PCB with it. I have seen some in the shops but the stuff I see looks like it has padding and is this a specialist modellers version ?
Thanks for replies guys.

 

[N017RW]

Many folks use dental floss to cut through the adhesive tape.

 

[landed]

Great tip ! thanks

 

[landed]

So onto the next hurdle my 25 w soldering iron maybe not powerful enough for the motor connection the end of the flex also seems a little stuck to the board to compound the problem. Will try a bigger iron but man this product seems like it was designed not to be messed with

 

[RoyVa]

Better to have a 75 watt iron to properly melt the solder. A 25 watt is just to light for motor connections solder joints.

 

[landed]

Thanks yes I have a higher powered one in my dads shed - it is a bit thicker on the end but I think I can still get in there ok. Thanks for sharing the info - peace.

 

[jason]

A 15w iron will do the job nicely that is if you what you're doing.

 

[landed]

A 15w iron will do the job nicely that is if you what you're doing.

Thats interesting as my 25 w one didn't seem to be able to melt the soulder - thought it might be higher temp stuff ? It almost was melting it but not enough that the wires could be pulled away. And I did wait for the iron to get properly hot as it was melting the soulder on my reel.

 

[jason]

Thats interesting as my 25 w one didn't seem to be able to melt the soulder - thought it might be higher temp stuff ? It almost was melting it but not enough that the wires could be pulled away. And I did wait for the iron to get properly hot as it was melting the soulder on my reel.

You need to keep the tip tinned. Have you ever soldered before?.

 

[landed]

Yes quite a bit and studied electrical and electronic engineering way back but tinning as far as I remember is for general technique of getting the wire to 'take a tin' first - I am at the stage of trying to remove the previous wires. I am not seeing the iron fully melt the soulder so that I think is the issue here - it really isnt easily removed as the flex is slightly glued and of course the earth also holds the other wire in place if the soulder was to melt just enough to let go...

 

[jason]

Yes quite a bit and studied electrical and electronic engineering way back but tinning as far as I remember is for general technique of getting the wire to 'take a tin' first - I am at the stage of trying to remove the previous wires. I am not seeing the iron fully melt the soulder so that I think is the issue here - it really isnt easily removed as the flex is slightly glued and of course the earth also holds the other wire in place if the soulder was to melt just enough to let go...

While you were studying I spent 20 some years of my life repairing circuit boards and equipment. A tinned iron is like honey to a bear. To remove the PCB and receiver takes a total of six screws, ten wires to unsolder and four cables to remove.

 

[landed]

Sry Jason I wasn't meaning to say that you didn't know what you were talking about. I was just stating that I had done quite a bit myself. In my old age my memory leaves me.

 

[jason]

Sry Jason I wasn't meaning to say that you didn't know what you were talking about. I was just stating that I had done quite a bit myself. In my old age my memory leaves me.

At 76 it I haven't lost much. The iron I use is switchable between 15 to 35w and you sure do not need 75w to do the job.

 

[kenjancef]

Maybe your soldering iron is defective? Not getting hot enough? It's a possibility...

 

[Pleuston]

The solder and boards are coated with some kind of clear protective coating. Remove that with a solvent and it should be easier to melt the solder

 

[jason]

The solder and boards are coated with some kind of clear protective coating. Remove that with a solvent and it should be easier to melt the solder

If in fact the receiver and PCB were stuck together, which is unlikely, as both are screwed on stand offs there would be more damage then two boards stuck together that would need to be replaced.