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Post by Decibel on Jun 23, 2015 3:53:20 GMT -5
Hi guys  Sorry for language but I live in Italy and I'm not familiar with english language. Well ... finally I have a projector of my dreams, it's a Barco Cinemax. It have a chassis gray and cover blue, gold logo Cine Max. HFQ900 lenses in minty conditions, absolutely no scratch in the bodies or glasses.  Previous owner was a crt killer because he placed the projector on the floor under the enormous and heavy wood box. When he wanted to turn the projector, opened a door in front of the tubes Absolutely no air circulation, it's a miracle that the projector never burned. I just bought the projector not working for 1000 euro. I think that the HT chain is good because the tubes show light ... very low light. The blue tube show also a noise with a light more intense than others. But no menu appear. Someone suggest to connect video source but I know that Barco must to show his logo/screen also without sources connect. So I think that the issue is in a video chain. I hope that the issue not in controller. There are red led lit on vertical board and rgb input board.     |
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Post by Decibel on Jun 23, 2015 4:20:18 GMT -5
Other pictures ...   |
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Post by Deleted on Jun 23, 2015 5:48:39 GMT -5
Since the red led on the vertical board is on there is no vertical sync so that is normal. Red led on switcher is also normal you do not have a source connected.
I would try connecting a source and see if you can get the two red led out.
Seems the controller is not injecting its menu's so you might not see feedback but still have a picture. If you do not get a picture I would try replacing the RGB driver.
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Post by gregstv on Jun 23, 2015 7:08:12 GMT -5
On the bottom of the RGB driver board near the connectors that plug into the main board there are 3 100uf caps. check them. I know this board differs from the 808s but from this part of the circuit appears to be the same. These caps caused the same problem on my 808s including the lit blue tube but not menu or pictures. There is one cap on each 12 volt supply to the output driver transistors for each Red Green and Blue driver stage. I have 2 units and both had all 3 caps leaky. Its a simple check and worth a shot.
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Post by Decibel on Jun 23, 2015 7:28:16 GMT -5
Since the red led on the vertical board is on there is no vertical sync so that is normal. Red led on switcher is also normal you do not have a source connected. I would try connecting a source and see if you can get the two red led out. Seems the controller is not injecting its menu's so you might not see feedback but still have a picture. If you do not get a picture I would try replacing the RGB driver. I tried to connect source, no result, I can't select input, so the red leds remain lit. I begin to suspect a controller failure  |
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Post by Decibel on Jun 23, 2015 7:34:56 GMT -5
On the bottom of the RGB driver board near the connectors that plug into the main board there are 3 100uf caps. check them. I know this board differs from the 808s but from this part of the circuit appears to be the same. These caps caused the same problem on my 808s including the lit blue tube but not menu or pictures. There is one cap on each 12 volt supply to the output driver transistors for each Red Green and Blue driver stage. I have 2 units and both had all 3 caps leaky. Its a simple check and worth a shot. Thank you gregstv. I tried to swap R7627205 (Cinemax) <---> R762720 (808s) driver board without success. The board of 808s is surely working with 808s |
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Post by Deleted on Jun 23, 2015 7:46:17 GMT -5
808s driver is not compatible.
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Post by mastertech on Jun 23, 2015 11:13:55 GMT -5
Does the blue tube look like your picture posted here or is that from the camera? Meaning is it a solid blue or like the picture.
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Post by Decibel on Jun 23, 2015 11:55:05 GMT -5
Does the blue tube look like your picture posted here or is that from the camera? Meaning is it a solid blue or like the picture. Like the picture, no solid blue. |
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Post by Decibel on Jun 23, 2015 12:15:26 GMT -5
Checked, no leaks. However I replaced the three caps with new caps, same value. Unfortunately no fix. |
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Post by mastertech on Jun 23, 2015 12:16:40 GMT -5
Well then the image tells us something. You have HV, you have deflection. Image looks like you don't have sync. If you had sync then the raster should be a smooth blue. It needs a sync signal from the controller even to display the menus properly. If this is the case then that could also explain the no green or red. They may be blanked. So the question is what is causing it. Well I am thinking you may have lost a rail voltage. Not all voltages have an LED to indicate they are working. So I would suggest testing some rail voltages.
The next question then is which board could the problem be on. Since you don't have more boards or a power supply to swap out are you able to do DMM testing? I'm thinking SMPS or controller at this point.
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Post by mastertech on Jun 23, 2015 14:25:11 GMT -5
In thinking about this some more I am starting to wonder if this is a vertical problem. Do you have a vertical board to try? I am trying to locate the service manual for the 808s to post here. I do not have the s version.
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Post by Deleted on Jun 23, 2015 17:00:42 GMT -5
If it is just the driver than connecting a source would show everything synced just no picture. I can't believe he does not try that.
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Post by mastertech on Jun 23, 2015 17:17:12 GMT -5
I believe he said he did try connecting a source and there was no change. Cause he cannot select an input.
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Post by Decibel on Jun 23, 2015 18:31:42 GMT -5
Yes I tried to connect source but I don't able to select input. I tried to swap vertical board also, with a cine 8 spare. No fix and bad noise from SMPS. No one has considered the mystery about no backlight of the fixed remote. All symptoms seems to show a controller failure.
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