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Post by mastertech on Sept 18, 2015 14:36:19 GMT -5
If all connectors are plugged into their correct spots and you then disconnect the green convergence coil harness (J257) and then try adjusting the N/S Bow and Key, does the green grid move correctly?
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Post by Decibel on Sept 19, 2015 4:43:12 GMT -5
Works only "side precorrection" (bow and keystone).
No works top and bottom bow/key.
No works left bow/key
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Post by Deleted on Sept 19, 2015 6:07:13 GMT -5
Just for the record.
I see my advise was confused. The north south bow is not done by the vertical (or horizontal) deflection. They can only do the east west bow. Makes sense as only the horizontal scan can be adjusted in timing.
So forget me and do not bother with the scanning yokes as the north south bow seems to be the problem.
Mastertech is up to something.
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Post by Deleted on Sept 19, 2015 6:38:06 GMT -5
Ok one idea. If I understand correct that switching the yoke connectors did not shift the problem we are sure the problem is not in the controller convergence boards.
So check the wires for red convergence perhaps a small wire is broken.
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Post by Decibel on Sept 19, 2015 6:45:31 GMT -5
Ok one idea. If I understand correct that switching the yoke connectors did not shift the problem we are sure the problem is not in the controller convergence boards. So check the wires for red convergence perhaps a small wire is broken. you mean the harness between the controller and the board of convergence? |
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Post by Deleted on Sept 19, 2015 7:00:03 GMT -5
No the harnass between the convergence yoke and the motherboard. You could change the comlete yoke but I do not know how easy that is as you have to remove the tube.
it is possible that the convergence yoke does not get the signal because a wire in the connector is loose. Or a pin is oxidated.
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Post by Decibel on Sept 19, 2015 7:37:48 GMT -5
I removed the tubes then I swapped whole defl/conv and focus yokes of the red and blue tubes.
The issue remain to red.
So it's impossibile that's the harness of the yokes.
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Post by Deleted on Sept 19, 2015 7:44:56 GMT -5
I removed the tubes then I swapped whole defl/conv and focus yokes of the red and blue tubes. The issue remain to red. So it's impossibile that's the harness of the yokes. Ok that is a clear and perfect test. Now the question is why do those electrons in the red tube not know they have to move when they see a magnetic field  Anyone? Just kidding. We have to reflect on this. I guess you used the red connectors on the motherboard for red and vis versa. That would mean that it is in the convergence board or controller and it means that i did not understand the results when you switched the harness from red to the blue connector on the motherboard. Could you explain what happened in that test? Did the problem shift? Might be easier to attache the red convergence yoke harness to green connector and green to red if the cables are not long enough. |
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Post by Deleted on Sept 19, 2015 8:02:40 GMT -5
Oh take care not to hurry and not to misplace a pin!
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Post by Decibel on Sept 19, 2015 8:04:27 GMT -5
What happens is very clear redfox. When we all begin to calibrate our projectors make a coarse adjustment of the geometry of the image.
When we go to adjust the sides (top, bottom, left and right) of the picture, the projectors they show only the grid of green because the other two colors must follow the adjustments of the green of the north, south, east and west. In my projector the blue grid moves in sync with the green in the adjustments that I mentioned just above. The red instead it does not. Simple.
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Post by Deleted on Sept 19, 2015 8:11:50 GMT -5
Yes that is clear. Now my logic goes like this. The correcting signal is made by the controller and send through the convergence output board to the convergence yokes.
You made sure that from the motherboard connector to the convergence yoke there is no problem.
Now I wonder if you tested if from the convergence output to the motherboard connector there is no problem?
To check that you could connect the red yoke harness to green on themotherboard and than the red should follow the corrections. I am sure that will be the case but it should have been the first test. I just missed if you did that?
If so it is simple in the convergence output or the controller. Probable the conv output and we can search further.
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Post by Decibel on Sept 19, 2015 8:24:28 GMT -5
I've done the test that you ask.
The red grid has behaved like green. Instead the green grid, being connected to the connector of the red, has not reacted. So the problem is on the circuit of the convergence of the red. Now we have to understand where is the fault in the red circuit.
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Post by Deleted on Sept 19, 2015 8:42:10 GMT -5
I've done the test that you ask. The red grid has behaved like green. Instead the green grid, being connected to the connector of the red, has not reacted. So the problem is on the circuit of the convergence of the red. Now we have to understand where is the fault in the red circuit. Ah ok. Very clear. If I understand wel the red does react on the convergence buttons but does not follow the green. So that means the problem likely is in the part where the green convergence signal is added to the red and that is on the controller. |
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Post by Deleted on Sept 19, 2015 8:56:46 GMT -5
I think there is only one resistor doing this when I check the schematic and that is R420. It should be a 1k resistor that adds the green vertical convergence to the red vertical convergence. Since it works well with blue only R420 could be broken in my opinion.
Could you check that one?
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Post by Decibel on Sept 19, 2015 9:00:58 GMT -5
In motherboard?
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Anyone? Just kidding. We have to reflect on this.
