Is the freezer part some trick or just so you can handle it?
Had a Line 6 MM4 come in.
Would not power on.
Checked all of the voltages, which where good.
3.3Vdc came up when a cord was inserted into the input jack.
Pressing any key did nothing.
Tried a master reset at power On (Hold A and D keys down, power On)
Scoped the crystal. Oscillating fine.
OK. Now what.
I used a 10X magiifier a looked at the main microcontroller.
Some of the solder pads looked iffy at best.
So I hit it with my Weller 750 degree heat gun and then popped it in the freezer for 10 minutes.
Lo and behold!
Thought I would pass this on.)
Here is a voltage measurement schematic.
And a brief of how the power supply functions from a gentleman in Scandinavia.
More than anything, I wanted to make sure the core of the ic was cooled down.
Well, after 3 hours running , it locked up.
Pulled the Eprom out & gave the pins a quick wipe with DeOxit.
Now it's working again.
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