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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 9:37 pm Post subject: |
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Done all that, the readings on pins 3 and 4 are 2.25vdc
CPU board, that sounds like fun! 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 9:40 pm Post subject: |
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I just remembered you said that someone was messing with the front panel. Can you disconnect that front panel, except for the master power switch.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 9:45 pm Post subject: |
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All but the main power switch is disconnected
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 9:47 pm Post subject: |
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Test your DC at those pins 3 and 4 again with it plugged in.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 9:51 pm Post subject: |
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Still at 2.25vdc
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 9:54 pm Post subject: |
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Ok, leave it disconnected and give me a few.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 9:57 pm Post subject: |
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Ok, Go to the digital board, should be number 3644. Locate D401 (good luck). 
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Wed Jan 25, 2012 10:17 pm Post subject: |
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Sorry to interrupt. But I love this thread!!! I'm confident You'll get it done!
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 10:28 pm Post subject: |
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Glad your enjoying. I'm sure we'll find it also but looks like we might be getting into some SMD work and not sure if Jeremy has done any.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 10:45 pm Post subject: |
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Holy maceral, that was quite the PITA to get to now the task of looking for the diode
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 10:48 pm Post subject: |
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Before you do that see if you can locate 2 switches by the CPU. Should be S404 and S405
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 10:49 pm Post subject: |
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Okay D401 is good to go, reads 590 one way and open the other
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 10:50 pm Post subject: |
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| macgyver655 wrote: | | Before you do that see if you can locate 2 switches by the CPU. Should be S404 and S405 |
Yes, I see S404 and S405
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 10:52 pm Post subject: |
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Slide switches? How many selections on each one?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 10:54 pm Post subject: |
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| macgyver655 wrote: | | Slide switches? How many selections on each one? |
They are basically on off, 2 selections, yes slide switches 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 11:01 pm Post subject: |
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Take note of their position then switch them both to their opposite and test your DC at pins 3 and 4 again. Just want to make sure no one was messing with those switches before.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 11:36 pm Post subject: |
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Same as before, 2.25 vdc doesnt matter where they are switched
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 11:41 pm Post subject: |
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Ok, good. Put them back to original.
Now go back to D401 and note its direction and remove it. Then go test your DC again.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 11:57 pm Post subject: |
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The DC reads 2.4 on pins 3 and 4 with the diode removed, the diode is good as well
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 11:59 pm Post subject: |
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Ok, that was a Y in the road and now we know which way to go. Locate D402. Should be in the same vicinity. Test if you like but remove it and check your DC again.
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