cpuwiz wrote:
Based on what you've described, I'd say you blew the fuse. I didn't even know it was blown for quite awhile and was pulling my hair out trying to figure out what was wrong. I went over all my cabling several times until I finally noticed the fuse and tested for power across it. I got +5v on side, 0v on the other.
Here's a pic of the back of my unit. It's mounted in an HTPC that I'm building, so pardon the angle.
http://izzywizzy.org/images/IMG_2745.jpgAnd a closeup of the new fuse:
http://izzywizzy.org/images/IMG_2742.jpgIt's a Littelfuse 2A SMT fast-acting fuse. I actually ordered this from Digikey:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=214079&Site=US&Cat=31916779'cause I wanted the fuse block to make it easy to replace a blown fuse in the future. Unfortunately, the fuse block was too wide and just wouldn't squeeze in there between the IC, capacitor and power connector. I ended up just soldering it directly, though it was a bit tricky to get my soldering iron in there on the left side.
The fuse by itself is this:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=219381&Site=US&Cat=31916779Just for grins, here is a comparison of the old fuse to the new one. The blown one is on the bottom:
http://izzywizzy.org/images/IMG_2749.jpg
Wiz, to your knowledge is there more than one fuse?
I had my vfd working fine. I was testing out a new cable for it and decided to try the self test. When I connected the power I saw a small spark between pin 2 and pin 3 of the power connector, after that the unit would not respond to either the self test or data sent with a known good cable.
I broke out the volt meter and I get 5 volts on one side of the fuse and 0 on the other. The "inner" side of the fuse has 5v. The side closer to the edge of the board has nothing.
I thought that before I go about soldering on the board I should try bypassing the fuse. I bypassed the fuse with a small piece of copper wire. Still no go. No self test and no image using a parallel cable.
I don't see any other obvious fuses, but I could just be missing it.