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Title: Vision Board Dead Post by: idesign on February 21, 2009, 12:08:07 PM I have a couple of vision mpu boards that are dead. I replaced the inverter with a known good one and the screen now lights up using a jumper on JP1 but I get nothing on the screen. Both boards look perfect with no burn spots. I'm assuming there is a common component on these boards that just fails after so many years of use. It's not the LCd since I tested the lcd in another working machine and they are fine. Any techs out there know if this is a common problem and what the component is that would cause this?
Title: Re: Vision Board Dead Post by: brichter on February 21, 2009, 03:55:24 PM Hmm, that's basically a PC motherboard. Is there any connection for a speaker that could signal POST codes? Usually something that will cause a no boot issue is display or memory related and the code would be output to the speaker in that case.
By the way, where is JP1 located? Title: Re: Vision Board Dead Post by: idesign on February 21, 2009, 04:04:08 PM JP1 is located behind the memory sticks near the fan. If you put a jumper on it you can watch it boot up just like a laptop. Try is and you will see what I mean. I get nothing.
Title: Re: Vision Board Dead Post by: brichter on February 21, 2009, 04:19:30 PM Question: I just jumped mine, and the LCD screen goes white then black when it initially powers up. Does yours do that?
Title: Re: Vision Board Dead Post by: idesign on February 21, 2009, 04:23:35 PM Nope, just white forever. No black, no messages.
Title: Re: Vision Board Dead Post by: brichter on February 21, 2009, 04:40:47 PM Whatever it is, then, should be pretty basic, as the motherboard isn't even trying to control the display. I'd start working the Vcc circuit (most likely 5v). Looks like the +12 is ok since the inverter powers up. I assume the little fan powers up also.
I'd start at J4 pin 4 That's where Vcc comes in. Title: Re: Vision Board Dead Post by: idesign on February 21, 2009, 07:50:51 PM Fan works fine so it's getting 12 v. The inverter runs on 5v as I recall.
Title: Re: Vision Board Dead Post by: brichter on February 22, 2009, 12:08:30 AM Hmm. Most of them I've seen use 12v for power, and could be 3.3 or 5 for signaling. There are a few that use 5v power though, mostly on small applications..
Title: Re: Vision Board Dead Post by: KirkLasVegas on February 22, 2009, 05:07:15 PM JP1 is located behind the memory sticks near the fan. If you put a jumper on it you can watch it boot up just like a laptop. Try is and you will see what I mean. I get nothing. Thanks for the "Heads Up" on the JP-1 jumper. Helped me with the Mata-Hari. Might install the jumper on the rest of my Visions... Kirk Title: Re: Vision Board Dead Post by: brichter on February 22, 2009, 05:53:40 PM Thanks for the "Heads Up" on the JP-1 jumper. Helped me with the Mata-Hari. Might install the jumper on the rest of my Visions... Kirk Yup. I'd give him a K+ but... :25- :25- :30- :3- :131- |