Line 6 DM4 repair question

[nash]

it's water damaged from someone mysteriously spilling a load of water on it. are Line 6 helpful and is it worth getting repaired?

[Alien]

The big question is whether it was powered up when the water went on it, or if it's been powered up while wet.
With a few exceptions such as relays, electronic components don't actually have much of a problem being wet (hence water soluble flux).
If it's not been fired up wet, take it apart, let it dry out somewhere warm for a few days and give it a try.

A

[nash]

It was powered up when the water got spilt. I think it may just be the EPROM chip that's gone.

[escholl]

If it's just the EPROM it will be a cheap repair for them, and should be for you. If it's the FPGA or whatever other microcontroller might be in there, it may be a bit more.

Crazy as it sounds, try putting it in a bag with lots of dry rice, and let it sit there for a couple weeks. That sometimes will suck out the excess moisture that might remain and can get things working again. The other thing you can try might be (carefully) re-seating the EPROM, and cleaning it's contacts, as water can sometimes make them corrode enough to stop conducting.

is the unit completely non-responsive? no lights, no sounds, nothing?

[nash]

It powers up and goes into some kind of error mode with multiple lights on and no sound. Contacts etc have been cleaned etc

[escholl]

[quote name='nash' post='917322' date='Aug 6 2010, 07:28 PM']It powers up and goes into some kind of error mode with multiple lights on and no sound. Contacts etc have been cleaned etc[/quote]

Ok, it could be the EPROM or FPGA being faulty, or it could be traces of water under one of the IC's shorting a logic high or low, or messing with the clock signal -- try the rice thing, you could also try cleaning the two main IC's with IPA, make sure you really get it underneath and then blow it out with some canned/compressed air, this should help remove the water if there is any underneath. By the way, I meant the EPROM contacts, not the I/O jacks, just in case there was any confusion.