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Post by Casethecorvetteman on Apr 1, 2016 22:41:38 GMT -5
Hi all  Ive got some distorted raster lines, about 1 foot of the left of the screen, im reasonably sure it is controller related but not sure where to look. Not the H or V board, swapped those last night. Not EHT board, swapped that last night. I have another controller here that doesnt seem to have this issue. |
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Post by Casethecorvetteman on Apr 2, 2016 2:33:38 GMT -5
Probably not the controller either, i just did a minor repair to my spare and swapped the whole tray. Issue is still there, but reduced and slightly different.
Id have to take a punt it could be the convergence board, id be amazed if it was the astig board.
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Post by gregstv on Apr 2, 2016 3:23:13 GMT -5
Any pictures of the problem?
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Post by Casethecorvetteman on Apr 2, 2016 3:59:39 GMT -5
Yeah ill see if i can get one.
I have the image a fair way to the right of the raster, but it is still an issue on the left.
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Post by Casethecorvetteman on Apr 2, 2016 4:04:45 GMT -5
Not really easy to see here because ive done a fair bit of work with the green fine convergence, but it affects all 3 colours about the same.  |
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Post by dummyload on Apr 4, 2016 10:33:59 GMT -5
Don't know if this is your problem but there is a potential problem in early versions control boards that can cause little distortion in raster. It's about the core supply +5vp +3v that is unstable (basically a to big ripple ,oscilation that occurs) because of far too low capacitance value on the output circuit +5vp. In early versions there is only 330NF at the output circuit of +5vp the core suplys +3,3v and 2,5v are also generated from +5vp, the correction is to add two capacitors of 100UF on or in proximity to output I68 (lm7805, +5vp) (in pdf new version board these are c396 and c397 page 8 ,pdf older versions page 9) R780822_01_Draft.compressed.pdf (825.66 KB) R780822_04_Draft.compressed.pdf (715.62 KB)) On early version boards there is no place reserved for them so the solder side is an easy way to add them plenty of place there. The value of output capacitors of the +3,3v c223 and +2,5v c225 must also become 100UF instead of 47UF now. Barco uses no longer elektrolytic types but smd keramic ones for these four capacitors in the upgraded version (smd tantalium is also good),every c223 on every early version board I had to repair was greatly degraded and had to be replaced. Normaly this will do it for the supply but it is possible that ripple on +3,3v at I13 and the rams is still off than extra caps parralel on c20 , c22 , c23 , c24 (I13 altera chip) are needed to bring +3,3v to spec. (yes it's number 13 that causes the havok) (it also depends on what type of ram that was used, making a big difference in load on +3,3v) I suspect this is a pcb issue , routing off the +3,3v traces not optimal the new version board has different routing and the core supplys on a new version board are perfect everywhere on the board. Also check all other caps to because they are not high quality types and they stand near a heat source. |
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Post by Casethecorvetteman on Apr 4, 2016 17:15:12 GMT -5
Thanks mate, so you reckon replace all those electrolytic capacitors on the controller board and add a few extras?
Believe it or not, its actually worse on the 2005 controller board i have here, the original board did not have the issue to start with, but it is there now, and you can almost adjust it out with convergence.
The 2005 board has 23,330 hours on it.
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Post by Casethecorvetteman on Apr 4, 2016 17:23:32 GMT -5
So because these are power supply lines it wont hurt to add another 100uF to each of those you speak of?
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Post by dummyload on Apr 5, 2016 1:34:58 GMT -5
No problem .
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Post by Casethecorvetteman on Apr 5, 2016 4:55:53 GMT -5
Thanks mate Ill give that a go sometime soon. |
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Post by Casethecorvetteman on Apr 8, 2016 6:40:18 GMT -5
Don't know if this is your problem but there is a potential problem in early versions control boards that can cause little distortion in raster. It's about the core supply +5vp +3v that is unstable (basically a to big ripple ,oscilation that occurs) because of far too low capacitance value on the output circuit +5vp. In early versions there is only 330NF at the output circuit of +5vp the core suplys +3,3v and 2,5v are also generated from +5vp, the correction is to add two capacitors of 100UF on or in proximity to output I68 (lm7805, +5vp) (in pdf new version board these are c396 and c397 page 8 ,pdf older versions page 9)) On early version boards there is no place reserved for them so the solder side is an easy way to add them plenty of place there. The value of output capacitors of the +3,3v c223 and +2,5v c225 must also become 100UF instead of 47UF now. Barco uses no longer elektrolytic types but smd keramic ones for these four capacitors in the upgraded version (smd tantalium is also good),every c223 on every early version board I had to repair was greatly degraded and had to be replaced. Normaly this will do it for the supply but it is possible that ripple on +3,3v at I13 and the rams is still off than extra caps parralel on c20 , c22 , c23 , c24 (I13 altera chip) are needed to bring +3,3v to spec. (yes it's number 13 that causes the havok) (it also depends on what type of ram that was used, making a big difference in load on +3,3v) I suspect this is a pcb issue , routing off the +3,3v traces not optimal the new version board has different routing and the core supplys on a new version board are perfect everywhere on the board. Also check all other caps to because they are not high quality types and they stand near a heat source. Im contemplating using either Panasonic FR capacitors or some good tantalums if i can find the right values rather than surface mounts, and adding them parrallel instead of uprating existing values. |
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Post by Casethecorvetteman on Apr 8, 2016 20:34:16 GMT -5
Don't know if this is your problem but there is a potential problem in early versions control boards that can cause little distortion in raster. It's about the core supply +5vp +3v that is unstable (basically a to big ripple ,oscilation that occurs) because of far too low capacitance value on the output circuit +5vp. In early versions there is only 330NF at the output circuit of +5vp the core suplys +3,3v and 2,5v are also generated from +5vp, the correction is to add two capacitors of 100UF on or in proximity to output I68 (lm7805, +5vp) (in pdf new version board these are c396 and c397 page 8 ,pdf older versions page 9)) On early version boards there is no place reserved for them so the solder side is an easy way to add them plenty of place there. The value of output capacitors of the +3,3v c223 and +2,5v c225 must also become 100UF instead of 47UF now. Barco uses no longer elektrolytic types but smd keramic ones for these four capacitors in the upgraded version (smd tantalium is also good),every c223 on every early version board I had to repair was greatly degraded and had to be replaced. Normaly this will do it for the supply but it is possible that ripple on +3,3v at I13 and the rams is still off than extra caps parralel on c20 , c22 , c23 , c24 (I13 altera chip) are needed to bring +3,3v to spec. (yes it's number 13 that causes the havok) (it also depends on what type of ram that was used, making a big difference in load on +3,3v) I suspect this is a pcb issue , routing off the +3,3v traces not optimal the new version board has different routing and the core supplys on a new version board are perfect everywhere on the board. Also check all other caps to because they are not high quality types and they stand near a heat source. And where is C225? I cant see it there on the sheets. I see C223 right below IC67 EDIT, found C225, thats a 330nF on the input side of I68, im going to have to assume you meant to say C253 which is the 47uF on the output of I69, the 2.5v output. Why 2x 100uF and not just 1x 220uF? |
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Post by Casethecorvetteman on Apr 8, 2016 20:57:23 GMT -5
Is this how you do them?  |
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Post by gregstv on Apr 9, 2016 3:47:05 GMT -5
Maybe a bit of non-corrosive silicon to help support them (RTV3140) seeing they are on the underside. Looks good to me. |
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Post by km987654 on Apr 9, 2016 6:42:39 GMT -5
You could use "Liquid Electrical Tape" comes in a tube and is made for just this purpose.
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