peter_77
Urgestein
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THE mcHF and UHSDR forum !
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Re:Firmware loading trouble
« Reply #30 on: 29. March 2018, 07:23:22 »
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This is used for mounting rain gutters or soldering your heating pipes in the house with heavy duty irons but never ever for electronics.
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AC9QP
Neuling
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Ich liebe dieses Forum!
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Re:Firmware loading trouble
« Reply #31 on: 29. March 2018, 20:42:10 »
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I used the MGChemical 8341 flux. Cleans up nice, with IPA and water. Good and tacky so it stays where you put it and doesn't turn to goo when using RoHS-temp irons. You can get it at Amazon or any of the big parts distributors (Digikey, Mouser, Newark, Arrow, etc.).
https://www.mgchemicals.com/products/solder-and-accessories/fluxes/no-clean-flux-paste-8341
Anything with salts in it will ruin your day with fine-pitch SMD work.
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AC9QP
Neuling
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Ich liebe dieses Forum!
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Re:Firmware loading trouble
« Reply #33 on: 29. March 2018, 22:01:50 »
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Second on the toothbrush. Also get a cheap spray bottle for IPA and for DI water (distilled or reverse osmosis works fine). I usually do three steps, spray IPA, scrub with toothbrush, spray IPA until dripping, spray water until dripping, shake off. I'd be careful using an ultrasonic cleaner as we have 32kHz crystals which can be cracked by the ultrasonic bath.
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sm0nor
schon länger dabei
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Ich liebe dieses Forum!
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Re:Firmware loading trouble
« Reply #34 on: 30. March 2018, 08:01:54 »
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This is used for mounting rain gutters or soldering your heating pipes in the house with heavy duty irons but never ever for electronics.
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I'm trying not to feel embarrassed 
Ulf
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sm0nor
schon länger dabei
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Ich liebe dieses Forum!
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Re:Firmware loading trouble
« Reply #36 on: 30. March 2018, 08:13:00 »
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I'm having success with the cleaning. I'm only using distilled water and a toothbrush because the darn salts from the bad fluss is not solvable in alcohols such as IPA. But I have to repeat brushing and rinsing and drying several times because the residue is really sticky, but now the board starts to look really nice again.
I'm drying with pressurized air in a home made drying-tunnel made from a an old PA blower and a 3 inch tube.
This is actually kind of fun....
/Ulf
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sm0nor
schon länger dabei
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Re:Firmware loading trouble
« Reply #37 on: 30. March 2018, 08:41:46 »
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Great tip in the video! I will try that with the new MCU scheduled to arrive at my doorstep after the Easter weekend.
/Ulf
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sm0nor
schon länger dabei
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Re:Firmware loading trouble
« Reply #39 on: 03. April 2018, 19:21:02 »
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Everything is a go now! A week of brushing, rinsing and drying over and over. New MCU in place. All systems go :-). Display is stable and all button pushes result in expected action on the display.
Thanks for all support in this very educational ordeal :-)
Over and out from this thread!
/Ulf
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