[chbot] Help SMD !

[Robin Gilks]

Many thanks for the offers - I might still need some help  but I've
borrowed a preheat hotplate from work and got some new flux and had my
first success putting down a lfqp64 10x10 processor (0.5mm pitch) with said
hotplate running up to 120c (checked by a sensor stuck to the PCB) and a
hot air gun with very low air flow but at 370C.
Next test is a microUSB connector with solder paste rather than tinning and
flux - should be fun ;)

I've ploughed on knowing that if I don't try (and get at least one winner)
then I'll be forever bugging other people at odd times.

Note to self - when redoing the PCB, put at least one LED on a GPIO to
flash when it's running.😁


On Fri, Sep 20, 2024 at 9:08 AM Tim Buchanan <clairinshkiwi at gmail.com>
wrote:

> Hi Robin,
>
> I can help you out with this if you still need. Flick me an email to
> clairinshkiwi at gmail.com.
>
> Cheers,
> Tim
>
> On Thu, Sep 19, 2024 at 11:30 AM Robin Gilks <gb7ipd at gmail.com> wrote:
>
>> Is there someone available over the next few days with the skills to
>> solder a LQFP64 STM32F303RCT6 chip to a PCB ? (I've actually 2 PCBs I want
>> to populate to continue my weather station prototype development). I've
>> managed to cook 2 CPUs now (possibly 3) and I'm running out!
>>
>> I've a whole list of likely causes to my dilemma, some of which I can't
>> do anything about (like the cataract in one eye) and other things like 3
>> weeks before the preheat hotplate arrives! and I also didn't add a solder
>> mask when I ordered the PCBs (hence my questions of a 2/3 of weeks ago
>> about PCB manufacture).
>>
>> On another note, any recommendations on supplies of solder paste
>> (preferably type 4 or 5) and gel flux. Most sellers on Aliexpress for
>> solder paste  seem to be obsessed with the melting temperature with no
>> information about ball size, leaded etc. Looking at Digikey, I'm sure they
>> have what I want if only I knew what I was trying to buy.
>>
>> Cheers
>>
>> --
>> Robin Gilks
>>
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