Chosen Solution
So I don’t know if I should buy this but I probably will. It is a iPod touch 4 with no backlights. As far as I know, it had no water damage. Where would I test things on the board? Any backlight filters, fuses, diodes, etc. I should check?
The iPod Touch’s are difficult to troubleshoot at a board level because there are no known schematics (if someone has them, please share a link!). That said, I’m certain the circuit is very similar, if not identical, to the iPhone 3GS/iPhone 4. You just need to figure out where on the logic board these parts located. Always start with the filter, then diode, then coil, then driver IC.
