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Post by mastertech on Aug 22, 2015 10:24:28 GMT -5
The flicker remain with connector J571. No flicker with J572. So I am thinking J571 is the problem that makes BV or RV or GV likely candidates I think. Here is the part for BV. I would check R82 and C92?  You are thinking incorrectly here. Your assuming the problem is coming in on one of the convergence adjustment lines. Why are you leaving out the WOK line? All 3 grids are being affected so it has to be something that is common with all 3. Now you could be right as I have not looked over the schematics yet and wont have time for a while, but if it were me, I would try to disconnect just the WOK line and retest the projector to see. If the grids were then stable I would check to see if the convergence is still working or not. |
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Post by Deleted on Aug 22, 2015 11:49:14 GMT -5
Oo you are right. I just said likely candidates. There are more and you have a good reason. I was thinking that perhaps blue was the problem and that the common power line made it go to the others too. But it is a guess.
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Post by Decibel on Aug 24, 2015 8:30:15 GMT -5
Your assuming the problem is coming in on one of the convergence adjustment lines. Why are you leaving out the WOK line? All 3 grids are being affected so it has to be something that is common with all 3. Now you could be right as I have not looked over the schematics yet and wont have time for a while, but if it were me, I would try to disconnect just the WOK line and retest the projector to see. If the grids were then stable I would check to see if the convergence is still working or not. How can I do this test? |
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Post by mastertech on Aug 24, 2015 9:28:26 GMT -5
Well there are a few ways you can disconnect the WOK line. Which ever one is easiest will be fine.
The WOK line is J571, pin 7 on the convergence board.
You can try removing the wire from the connector if it is removable.
Or you can cut the wire going to this pin.
Or you can remove D204 or R220 on the convergence board. Either one, which ever is easier.
Once this line is disconnect then retest projector for grid vibration.
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Post by Decibel on Aug 24, 2015 9:34:08 GMT -5
Well there are a few ways you can disconnect the WOK line. Which ever one is easiest will be fine. The WOK line is J571, pin 7 on the convergence board. You can try removing the wire from the connector if it is removable. Or you can cut the wire going to this pin. Or you can remove D204 or R220 on the convergence board. Either one, which ever is easier. Once this line is disconnect then retest projector for grid vibration. Tomorrow morning I'll try to cut a wire 7 from a donor cable. This time I predicted this step but I was expecting your confirmation. |
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Post by Decibel on Aug 25, 2015 2:07:05 GMT -5
I am very disheartened. I tried to disconnect that line and no solved. Instead I felt burning smell. I found another (apparently) burned resistor in the convergence board. It still works but somewhere there is still a damn problem. And I must to solve the new problem at vertical board.
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Post by Deleted on Aug 25, 2015 4:42:04 GMT -5
I am very disheartened. I tried to disconnect that line and no solved. Instead I felt burning smell. I found another (apparently) burned resistor in the convergence board. It still works but somewhere there is still a damn problem. And I must to solve the new problem at vertical board. Perhaps you can conclude that the WOK line did not fix it but made it worse somehow? Time to try the other options? What resistor burned? |
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Post by mastertech on Aug 25, 2015 8:40:04 GMT -5
I found another (apparently) burned resistor in the convergence board. Which resistor is it? |
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Post by Decibel on Aug 25, 2015 11:43:34 GMT -5
I found another (apparently) burned resistor in the convergence board. Which resistor is it? R52  |
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Post by mastertech on Aug 25, 2015 15:15:47 GMT -5
I guess it could of been caused by the lack of the WOK line. But why not the same resistors of the other colors and such also overheat. If it still reads its correct value I would not worry about it.
I would just reconnect the WOK line and then try cutting the color lines 1 at a time to see if just 1 color corrects all 3 grids. If not then some testing will need to be done on the controller.
But I agree you should probably get that vert board problem straightened out first cause you never know. What was not working? Pin or bow or something. Thread is getting to long to look back, lol.
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Post by Decibel on Aug 25, 2015 17:30:32 GMT -5
I have a suspicion: tomorrow I have to check with calm. The desire to solve the problem of the projector is making me commit many silly mistakes. To make the last test I did not cut one of the 7 little wires, but I used a 6-wires connector. Perhaps I have left free the WOK pin of the convergence board but covered the WOK pin of the controller causing totally bad connection between boards. If so, I hope I have not damaged anything.
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Post by Decibel on Aug 27, 2015 4:57:01 GMT -5
I entered the good controller and restored the proper connections between the two cards. The resistor R52 overheats. The green hops (?!?!) on the screen. Below the picture of the circuit of the resistor R52.  |
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Post by Decibel on Aug 27, 2015 6:57:42 GMT -5
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Post by dummyload on Aug 27, 2015 10:45:48 GMT -5
These two resistors are mounted very fragile and break easy, the result is smoking convergence board because dc offset is way off. Had this fault on a controller board ,fix it .
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Post by dummyload on Aug 27, 2015 10:49:15 GMT -5
It's no repair it's standard on all boards by barco
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