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Author Topic: Vision Board Dead  (Read 4711 times)
idesign
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If it aint broke why mess with it?????
« 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?
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brichter
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« Reply #1 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?
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Bill
idesign
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If it aint broke why mess with it?????
« Reply #2 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.
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brichter
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« Reply #3 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?
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Bill
idesign
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If it aint broke why mess with it?????
« Reply #4 on: February 21, 2009, 04:23:35 PM »
Nope, just white forever.  No black, no messages.
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brichter
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« Reply #5 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.
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Bill
idesign
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If it aint broke why mess with it?????
« Reply #6 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.
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brichter
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« Reply #7 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..
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Bill
KirkLasVegas
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« Reply #8 on: February 22, 2009, 05:07:15 PM »
Quote from: 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.

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
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Definition of "Retirement"= to be able to get back all you contributed into it AND take some of their money too before dropping dead.
brichter
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« Reply #9 on: February 22, 2009, 05:53:40 PM »
Quote from: KirkLasVegas on February 22, 2009, 05:07:15 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...  Duh! Duh! frying pan   applause Hail
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Bill
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