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Post by mastertech on Aug 11, 2015 9:03:28 GMT -5
When I said "tested sr2 resistor" intend with convergenge tray pulled. Projector power off. Right, I knew that. I am trying to determine what is the difference now with both conv voltages being high and from what you have been saying, the only difference is the jumpers are still disconnected. Unless you reconnected them and did not say so and now both voltages are still high. So which is it? |
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Post by Decibel on Aug 11, 2015 9:09:55 GMT -5
don't remember if the jumpers was removed in the check of the picture above.
Yes I replaced anyway the SR2 resistor with a fresh one.
Actually the jumpers are both removed.
Say me which test I must try.
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Post by mastertech on Aug 11, 2015 9:25:23 GMT -5
Put jumpers back in, make sure all boards and everything are connected, hook up a source and see if it displays an image and then check the onscreen voltage readout. Also keep an eye on that SR2 when first running to see for smoke.
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Post by Decibel on Aug 11, 2015 9:31:44 GMT -5
Put jumpers back in, make sure all boards and everything are connected, hook up a source and see if it displays an image and then check the onscreen voltage readout. Also keep an eye on that SR2 when first running to see for smoke. Oookkk I tried this test as soon as possible. |
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Post by mastertech on Aug 11, 2015 11:35:27 GMT -5
My last screenshot of the voltages:  These voltages are when operating of cause. Do not know what they are in standby. The do not seem to far off from Decibels on data. Except the +con. Nice find on decibels EHT board redfox. I noticed your HTHD voltage is much higher then the others. I wonder what this is. |
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Post by Decibel on Aug 11, 2015 14:37:04 GMT -5
Put jumpers back in, make sure all boards and everything are connected, hook up a source and see if it displays an image and then check the onscreen voltage readout. AlBoth Security Resistor went overheat but SR2 is completely deadso keep an eye on that SR2 when first running to see for smoke. Well I tried the test that you suggest Here the voltage WITHOUT jumpers.  Then below the voltage WITH jumpers  Both Security Resistor go to overheating and SR2 was completely dead   |
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Post by Decibel on Aug 11, 2015 15:25:24 GMT -5
Replace the burnt resistor on the convergence board reinstall but disconnect j571 and j572 , the convergence amplifiers are dc coupled so any wrong dc level coming from the controller can make one off these resistors burn . So by unplugging the controller , if the board is fine nothing should happen with the resistors ,if they burn again there is something wrong with the board. I have had this error on a controller board waveform ok but about 2v wrong dc offset, caused by a broken smd resistor . You think that if I had disconnected the controller, the resistance would not be fired? On which card was the broken SMD resistor that caused you problems? Controller or convergence? Now I need other Security Resistors. Hulio wrote that they are very rare. |
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Post by hulio on Aug 11, 2015 16:21:05 GMT -5
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Post by Deleted on Aug 11, 2015 16:33:57 GMT -5
Nice find on decibels EHT board redfox. I noticed your HTHD voltage is much higher then the others. I wonder what this is. Yes ok I see it too. It might be because I had the pot p700 that adjusts the horizontal width far off in the beginning. I have to check again when I fire the Max up again. Good point to check! |
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Post by Deleted on Aug 11, 2015 16:44:19 GMT -5
Like Mastertech said. It is strange that without the jumpers the +con and -con is not that high anymore.
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Post by mastertech on Aug 11, 2015 16:44:27 GMT -5
Put jumpers back in, make sure all boards and everything are connected, hook up a source and see if it displays an image and then check the onscreen voltage readout. AlBoth Security Resistor went overheat but SR2 is completely deadso keep an eye on that SR2 when first running to see for smoke. Well I tried the test that you suggest Here the voltage WITHOUT jumpers. Then below the voltage WITH jumpers Both Security Resistor go to overheating and SR2 was completely dead Well first off, those voltages now do not look that bad. Now, as to those 2 SR's overheating again........... I "STILL" "DO" "NOT" "SEE" "YOUR" "METER" "OHM" "TESTED" "VALUES". I have asked multiple times. The color bands do not value out to what the manual says is required. So where did you get the replacement one from? Did you value test it? |
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Post by mastertech on Aug 11, 2015 16:46:47 GMT -5
Like Mastertech said. It is strange that without the jumpers the +con and -con is not that high anymore. Actually, this is why I have him now running a source. The voltage may change depending on the source resolution. |
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Post by mastertech on Aug 11, 2015 16:48:02 GMT -5
It was different before when the voltage was substantially different.
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Post by mastertech on Aug 11, 2015 16:53:00 GMT -5
Once we get this SR value thing sorted out I am going to have you run the projector with a source but without the 2 jumpers. And while the jumpers are out I want you to neutral out "all" the convergence and geometry settings. Then we will see what is happening when the jumpers are put back in. But we may use something other then the SR's for now so we do not keep damaging them. I will let you know what I think we will try.
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Post by Decibel on Aug 11, 2015 17:12:07 GMT -5
I pulled the fresh Resistor from a donor Convergence Output board of one Barco 808 that I have.
Now I have many doubts but I'm pretty sure that service manuals say that these resistors have same values. Tomorrow I'll read the values with meter.
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