Search the Community

Hi all, I just received a UX8 I bought on eBay as spares or repair because it does not power on. According to the prior owner, this was due to a vaguely defined “short on the motherboardâ€, which an (unaffiliated with Line 6) engineer could not diagnose, so the decision was made to give up and sell it. Fair enough: it would be quite a bargain in almost any condition. I opened it up to have a look (which was easy due to all but 3 of the screws having been discarded during the aforementioned attempt at repair), and found that, not far from the power input, there were: a burnt/scorched area on the paper wrapping around the induction coil/SMD named L6 and/or L9 (both labels are next to it and don’t seem to refer to any other part), what might be burning and/or partial lifting out at the through-holes of diode D5, possibly the same effects at capacitor C120, and —get this—what seems to be an entirely missing part, of some type, perhaps a MOSFET or vreg or similar: a section labelled U57 U37 with one side bearing five pins that seem to have residual solder on them, a square that seems to have some kind of adhesive or heat-sink paste from a previously emplaced component, and yet no component to be seen! I’m no expert detective, but this all suggests to me that component U57 U37 has been overloaded and exploded, damaged the others in the process, flown clean off the board, and—via a less-than-careful previous handler, I can only assume—somehow disappeared never to be seen again. I have requested more information from the previous owner and engineer, but, given that they claim not to have noticed this obvious blast-radius, I’m not holding my breath for any revelation. When I buy things as broken, I expect them to be broken but not entire parts to be missing. If they genuinely didn’t know, I’m unsure how the trail of evidence can have been overlooked. I have opened a ticket with Line 6 to request a schematic or some other form of assistance. However, I wonder whether any other owners of a UX8 would be kind enough to open their UX8 up and describe what they see in the equivalent area, preferably with a good-resolution photo? It would be massively appreciated. Seeing what that area looks like in a functioning machine will hugely improve the chance of me being able to repair this one. I’m especially keen to find out what component U57 U37 is supposed to be—type, value, and any other information I would need to replace it. Thanks in advance, fellow UX8 owners! [edit] fixing cmpt # [/edit]