Chosen Solution
I replaced the digitizer and blew the backlight fuse. I jumped it and the backlight works now, but I can’t get it to go past the white apple logo screen. I’ve tried reseating the connectors, holding the home/power buttons, but it just does the same thing. What are my next troubleshooting steps?
How did you blow the backlight filter? Was it because you forgot to disconnect the battery prior to removing the LCD? If so, it is possible that the damage goes further upstream to the backlight circuit. Depending on the damage, it could also be causing other problems impeding the boot sequence if some voltage rails are current limited. You don’t really say how comfortable you are troubleshooting board level problems so I’ll let you get back to me on that front. However, ideally, you should look for an experienced micro-solderer to properly troubleshoot your board.
