Kunkin KP184 DC electronic load--anyone else seen this problem?

[drm1]

I have a relatively new KP184. After a few uses (no traumas I know of) it starts up with every panel indicator and 7-segment display fully lit up, and does not respond to any key press.

All the rails check OK (+/- 12, +5, +3.3). For a while, anyway, there was a sine wave on the crystal and some signals on a few processor pins; now I don't see those, either. Has anybody else seen this failure? And has anybody had any luck getting the manufacturer to reply to a warantee repair request--or at all?

Thanks, --Dan M

[interflexo]

You can test if it responds to serial commands. A normal working unit works the front panel disconnected.

[drm1]

I pulled this out again after a year. Because the rails all seemed OK and the display worked, on a hunch I tried reflowing the processor as a last resort. It took a few tries but lo and behold that did the trick--the unit seems to work fine. Bad solder joint, I guess; maybe this will help somebody in the future.