I'm here to confirm my podhd400 has been fixed by the "vanroboli" method. initially, I thought the problem was somewhere else and I removed the bios and tried to dump the memory to see if it was corrupted or not because there wasn't any sign of digital life in the system. after resoldering the bios, it start booting up without the clear sound and had the distinctive cutting out sound of a blown transistor and bad capacitor. so I start chasing the signal by injecting 1khz audio from iPhone + youtube 1khz video to input and soon realized signals wouldn't get through the guitar input but was no problem with MP3 input so I start looking more closely to those preamp areas actually under the microscope and despite checking with a powerful magnifier I missed the blue Cooper corrosion 1st time. so when I saw the corrosion I realized those little capacitors should have been leaked and the galvanic resistance between opamp legs plus damaged caps caused the issue. to fix the issue just removed the caps and replace them with new ones except 1 which I replaced with tantalum as I couldn't find more than 3 new caps in my parts... anyways I applied a generous amount of Rosine flux and reflowed every single part under the shield adding lots of rosins was important to draw out those Cooper salts from corrosion and after cleaning with alcohol and reassembling it fix and worked as good as new. honestly a little bit sad it fixed so quickly I was looking forward to troubleshooting and fixing this unit. this is my 3rd broken line6 board which I purchased from eBay to fix and all of them are fixed and working properly.
I'm a bit surprised how and why so many of these signal capacitors leaked and damaged prematurity as they are not subjected to any high voltage, high temperature, or lots of current going through them like switchmode power supply capacitors. I hope this information helps people who are interested to restore or fixing their podHd boards.
