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Post by Decibel on Sept 30, 2015 11:56:05 GMT -5
The current limiter is common to all three colours. I think you created a new problem or the new part was broken etc. Do the tests mastertech told to do! Pictures of what was done are also usefull. I want to do what Master asks. I would just like to understand if the circuit cross is still useful for testing. I checked several times welds of I90 and should be good. |
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Post by Decibel on Sept 30, 2015 12:00:36 GMT -5
All caps seems no short.
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Post by Deleted on Sept 30, 2015 12:01:04 GMT -5
Not ask just do  By the way did you work with a wrist thingy to prevent static electricity from destroying chips? |
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Post by Decibel on Sept 30, 2015 12:08:27 GMT -5
Z2 ... meter in diode mode show value 922.
This is the same value of Z62 in the blue circuit.
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Post by Decibel on Sept 30, 2015 12:09:29 GMT -5
How to test Q1?
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Post by mastertech on Sept 30, 2015 12:42:08 GMT -5
Just set your meter to diode scale and test the 3 legs in all different directions comparing the readings with the same transistor in another color. |
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Post by Decibel on Sept 30, 2015 12:47:09 GMT -5
Just set your meter to diode scale and test the 3 legs in all different directions comparing the readings with the same transistor in another color. Checked. The values of Q1 are the same of Q61 |
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Post by mastertech on Sept 30, 2015 14:54:44 GMT -5
Then I guess try changing I1. Leave the colors crossed. It should not matter.
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Post by Decibel on Sept 30, 2015 15:12:47 GMT -5
I tried to change I1 then I90. The fault remains. I say enough with attempts to repair. I give up, I'll try to seek another spare part. Thank you for everything you have done for me Master.
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Post by mastertech on Sept 30, 2015 15:34:53 GMT -5
Sure, no problem. If I had a 909 test unit here I would say send the board to me. Which is why I was trying to buy that 909 that is local to me. But he just wants a little more for it then I think I could recover in doing 909 board repairs.
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Post by Decibel on Sept 30, 2015 15:41:34 GMT -5
I hope you will be able to take the projector. But not just to make a test unit, but also to see the movie/video. It is an amazing projector.
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Post by mastertech on Sept 30, 2015 15:49:38 GMT -5
I hope you will be able to take the projector. But not just to make a test unit, but also to see the movie/video. It is an amazing projector. I already have a couple of the most amazing projectors ever created and have owned them for decades. Ampro...... |
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Post by mastertech on Sept 30, 2015 16:00:25 GMT -5
You should try removing those jumpers and put everything back to normal and try it in the projector one last time.
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Post by Deleted on Sept 30, 2015 16:21:58 GMT -5
Ok one final remark from me. I do not see how it could be possible that the convergence output board subtracts the green bow from red. In my opinion logically the fault has to be in the controller but I know the test indicated otherwise. But now that no solution is found on the convergence board I would start doubting the test. Perhaps the red did not move because a wire was not connected properly?
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Post by mastertech on Sept 30, 2015 16:26:16 GMT -5
Ok one final remark from me. I do not see how it could be possible that the convergence output board subtracts the green bow from red. In my opinion logically the fault has to be in the controller but I know the test indicated otherwise. But now that no solution is found on the convergence board I would start doubting the test. Perhaps the red did not move because a wire was not connected properly? Well then all he would need to do to verify this after removing the jumpers is swap the r vin and b vin. |
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