PCB etching with photosensitive dry film – now working consistently. – The Society of Secretive Squirrels
Rectangular Brown Lg Washing Machine Pcb Board at Rs 2949/piece in South 24 Parganas | ID: 24595649788
That shiny brown stuff is flux right? Is that bad? Should I remove it? : r/AskElectronics
what causes the black corrosion /deposit on the pcb? | Electronics Forum (Circuits, Projects and Microcontrollers)
should i worry about this stuff? there's some brown stuff on what looks like a black capacitor, with one side having a silver top, and some yellow stuff under what looks like
How to Prototype Without Using Printed Circuit Boards : 8 Steps - Instructables
Sticky brown gunk smeared all over the underside of a PC Engine Duo system PCB — Could it be that infamous electrolytic fluid from leaking caps, or something more harmless? : r/consolerepair
Printed circuit board - Wikipedia
Desoldering...... I have another soldering question for you guys, what's the best method of desoldering large pads like this without hurting nearby components? I have a Hakko FX-888D and an old Weller