David----I'll chime in:
1.) In your photos, you're only looking at maybe 20% of the board, you aren't really cleaning 80% of the board. I used to do the same thing, and then I would sometimes pull the shields after the cleaning(s) and there would still be a ton of corrosion/oxidation---the ultrasonic isn't enough.
My advice--pull the shields if you are attempting to clean any board that shows any oxidation on/next to the shields---this one sure did.
2.) No magic cleaner will reform broken solder connections from 'old' water damage like this one. You have to reflow components for success. In the board you have shown, no amount of cleaning can overcome the fact that your LCD connector has lost its pad required for backlight (the third pin). This board will never show a display unless a microjumper is built to connect the socket pin with the 'good' part of the trace under the solder mask.
3.)---I have started using Kester 951 flux as a cleaning solution since the purpose of flux is to remove oxidation, I figured a light flux would be a great choice for water damage cleaning solution, but who knows. My success rate went way up once I started with a microscope eval---if the board has focal oxidation, I will attempt it. If the board has diffuse oxidation, it is not worth the time. The process is then just microscope eval, shield desolder, ultrasonic plus spot clean, reflow oxidation, test. This seems to be the ticket to success for me.
keep us posted with what you find out!
jessa
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