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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Nov 27, 2007 11:51 pm Post subject: |
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Check the jumpers in the DVDO, chances are that they are not set for RGBHV.
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Wed Nov 28, 2007 5:53 am Post subject: |
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To be set in RGBHV the jumpers have both to be set to "normal" right? So something is wrong with DVDO or with my 1271! 
I can lock the picture only in RGsB or RGBs. This way is there something special on M8000 to have RGsB or RGBs working properly?
Ciao
A
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Mon Dec 03, 2007 9:26 pm Post subject: |
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Update.
I followed the magnetics 101.
The result is better but
1. On RED tube I cannot focus the side part of the tube. I mean that I can focus center, top/bottom but right/left are doing absolutely nothing. I swapped the focus plugs on Focus board but I was not able to understand if it fixed because I cannot adjust side focus while all colors are on (at least I think I can't). However was clear that RED focus was working properly (driven by GREEN focus board) so it's not the tube. I visually inspected the card. I did not find any burned resistors or anything strange.
2. I still cannot focus perfectly the left/right part of all colors. I'm sure that it's not a lens' issue because
a) I watched with soldering glasses throught the lenses, the focus is blurry ON THE TUBE itself.
b) I can perfectly focus the sides of the CRTs working on electronic CENTER focus (without moving the lenses). But I cannot have both center AND sides focus the same.
Focus become very blurry from sides to center over 50 of contrast...
Hints? Focus Board faulty?
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Mon Dec 03, 2007 10:35 pm Post subject: |
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| tony359 wrote: | Focus become very blurry from sides to center over 50 of contrast...
Hints? Focus Board faulty? |
here's a hint, stop wasting your time on that thing. It's just not worth it 
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1031
Joined: 22 Mar 2006
Posts: 657
Location: Finland
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Tue Dec 04, 2007 9:36 am Post subject: |
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1031
Yes, I saw there are three section on that card. I can check but I cannot have decent focus on all colors (I do not remember the blu one).
I can't believe that focus board is fault for all colors...
Ciao
A
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sat Dec 08, 2007 1:41 am Post subject: |
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I have an Idea.
Since, if I remember correctly, at low contrast setting the image are sharp, and since the HV transformer is hissing at high contrast, could a bad HV transformer be the cause of the bad focus at high contrast? I still did not test one tube at a time.
The guy I'm helping reported a "H-Fail" on the CRT one time...
I know Draganm, but I'm doing it the same!
Ciao
A
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