Re: The evils of leaving solder flux on boards
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I just clean the flux residues with isopropanol and an old toothbrush, trying the (already dirty) liquid does not get into tact switches, trimming potentiometers, trimming capacitors, dip switches, rotary switches, buzzers, connectors. Also clean the edge connector with a cloth before the alcohol evaporates. 19 de junio de 2024, 07:33:41 p.?m. ART, Glenn Little <glennmaillist@...> escribió: Be careful with circuit boards in an ultrasonic cleaner. The bond wires between header and die can be broken by the ultrasonic energy. Glenn On 6/5/2024 7:21 PM, Reginald Beardsley via groups.io wrote:
Well, add another flux repair to the list. LG window AC wouldn't work as in no response at all. On inspection board was saturated with flux. Cleaned it and it immediately started. I'm beginning to think that this is a deliberate design defect in a lot of consumer grade stuff to sell replacement products at 2-3 year intervals. I strongly suspect that if I subjected new kit, still in shipping box to a 100% humidity chamber for a week or two it would not work when powered up for the first time. BTW I bought a 30 liter ultrasonic cleaner for this sort of "repair" work. It will take a full size HPAK PCB. Have Fun! Reg -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license" |
Daniel Ricardo Perez LW1ECP