Quite a few of those corroded VIAs look to be ground but you would still need to fix many of them in order to get this board working again. If you get another board for reference, that would be great however it will be a lot of work. I restore them by scratching off the solder mask on both sides and solder in a wire. No need to drill or anything.
well that sucks, you have to be careful with these, if a battery leaks on these they are done for, it just eats the entire board from the inside out, the basic issue is that it eats all the vias first which is enough to make the board unrecoverable without extensive rework
Hey mate, by any chance would you be willing to sell this thing? I bought one myself but it was sold as advertised without a card reader. But it turns on. So if I bought this off you I might be able to fix it. Let me know if you're interested :)
