tstraub
11-28-2009, 09:30 PM
I have a Grinch board populated with 2 alegro chips and 8 SSRoz's The Grinch is connected th the pc parallel port and power is coming from the pc power supply through the RJ-45 connector. All was well for over a week but tonight I looked out the window and my mini trees were on green solid instead of blinking.
So I started to try to diagnose this and here is what I have found. Any time any of channels 29-32 go on all of them come on and stay on until I remove power from the Grinch. So I looked at all the solder joints on that jack and chip. all looked fine but I decided to re-flow the joints and scrub them with 91% alcohol just to see if it would help. That did not change anything. Then I swapped in a new chip, no change. Any thoughts on this?
I Did throw a 3rd chip and one more jack in the Grinch then remapped those channels so at least the show is still going, but I would still like to fix this problem because I plan on using all 64 channels next year
thanks
Tyler
So I started to try to diagnose this and here is what I have found. Any time any of channels 29-32 go on all of them come on and stay on until I remove power from the Grinch. So I looked at all the solder joints on that jack and chip. all looked fine but I decided to re-flow the joints and scrub them with 91% alcohol just to see if it would help. That did not change anything. Then I swapped in a new chip, no change. Any thoughts on this?
I Did throw a 3rd chip and one more jack in the Grinch then remapped those channels so at least the show is still going, but I would still like to fix this problem because I plan on using all 64 channels next year
thanks
Tyler