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Post by Decibel on Aug 9, 2015 15:57:04 GMT -5
Why the meter show value between probes? SR1 and (apparently toasted) SR2 show same values.
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Post by hulio on Aug 9, 2015 16:17:20 GMT -5
Not sure why, Decibel. I guess because they are still in the circuit ? You should measure both out of circuit...
Wait for Mastertech's reaction too. His electronics knowledge is beter than mine ( ond others ).
All i can say is that the resistor does not look healthy, and since your +conv voltage is off.....
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Post by Decibel on Aug 9, 2015 17:22:14 GMT -5
Replaced resistor, no fix.  |
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Post by mastertech on Aug 9, 2015 20:19:37 GMT -5
Well looks like there has been some fun while I was away, lol.
Ok, first things first. A resistor can overheat and look like that but still hold its value. But something still caused it to overheat. But it also could of happened a long time ago. But also odd that it got that hot and did not fail. Unless it did actually test open after being removed from circuit. What reading on your meter set at ohm rating do you get?
So back to where we were. Can you run the projector with the convergence board removed, meaning, will it stay running or shut down with an error? If not, then remove those 2 jumpers, W1 and W2 and recheck those voltages, if it stays running with these removed. Also, verify those 2 voltages with your meter on DC voltage to make sure it is not just a malfunction in the detection circuit. Do not be afraid to run the projector with boards not installed. That is what the protection circuits are for.
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Post by Decibel on Aug 10, 2015 1:02:55 GMT -5
I removed the jumpers and replaced SR2. Looking at the service manual of SMPS+G2 board I realized that I could control the +CON voltage at the point M100 to the top edge of the board. I made a pin for check voltage.  When I turn on the projector the correct voltage (37/39v) appears for a few seconds, then suddenly doubles until 65/67v. Of course the same thing happens to the pin of the jumper SW of the convergence board. So we can know that the control panel of Barco's software displays real data. Here a screenshot of data after some seconds of projector turn on.  Reading the service manual of convergence board, the current +/- CON is always symmetrical. In normal operating conditions it must be balanced to values of about 37/39v as we can see in the screens pictures of Hulio and Redfox. In my projector it is balanced also but with double values than normal. Maybe this is the cause of the overheating of the SR Security Resistor. We must find what generates a wrong voltage. I point out that I have two SMPS+G2 boards and both have the same behavior. I must therefore think that the problem be found before of these boards. |
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Post by Deleted on Aug 10, 2015 4:48:24 GMT -5
I am still curious what fixed the 9V? You had a spare smps and that did not fix it but still something on the smps was broken? Just curious.
if true perhaps something in you max is killing the smpts?
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Post by Decibel on Aug 10, 2015 5:20:41 GMT -5
Both SMPS has problem of ++9v.
I did all tests suggested by Mastertech on my SMPS board.
The fix that solved the issue was the replace of two diodes.
So I replaced these diodes in both of SMPS and ++9v voltage back definitely on both boards.
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Post by Deleted on Aug 10, 2015 5:29:11 GMT -5
Both SMPS has problem of ++9v. I did all tests suggested by Mastertech on my SMPS board. The fix that solved the issue was the replace of two diodes. So I replaced these diodes in both of SMPS and ++9v voltage back definitely on both boards. Ah ok I understand. Still a question what caused these diodes to break down? In fact I am thinking perhaps you changed the PFC? |
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Post by Decibel on Aug 10, 2015 6:02:18 GMT -5
I don't know if the boards that I purchased will solve the issue.
However they can be spare parts.
The PFC board during tests has shown a spark.
I don't know if this spark has damaged something.
I'm curious to swap the controller board also.
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Post by Deleted on Aug 10, 2015 6:26:06 GMT -5
Ok well lets forget it until the problem returns.
I suggest following what Mastertech said. He said to try to run the projector without the convergence board. Did you try?
One other thing I see that the EHT does not run. Do you see a red led burning on the EHT when power is on? Check the fuse on the EHT. Might be the EHT or the quad or the splitter.
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Post by Decibel on Aug 10, 2015 6:58:19 GMT -5
I suggest following what Mastertech said. He said to try to run the projector without the convergence board. Did you try? Yes I tried. No red led on the EHT board and no EHT fuse blown |
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Post by Deleted on Aug 10, 2015 7:01:59 GMT -5
I suggest following what Mastertech said. He said to try to run the projector without the convergence board. Did you try? Yes I tried. No red led on the EHT board and no EHT fuse blown Ok I think your projector should make an image even if the convergence does not work. Do you have spares for EHT, quad, splitter? I remember that in the beginning you did have high voltage and light in the tubes? Did anything happen? If the spark on the pfc has somehow overloaded something on the EHT perhaps you could see a blackened resistor on the EHT? I once had a failed EHT and a friend saw that a resistor was black and a transistor was broken. He fixed it for me. In my case there was also no red led on the EHT. I think your EHT is broken and not the quad or splitter just like in my case. |
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Post by Decibel on Aug 10, 2015 7:19:03 GMT -5
Unfortunately no more light in the tubes now Perhaps is a stupid thing but the circumstance that the failure of built-in remote always convinced me that also the controller have some issues. Now the power of the controller is supplied but it no provide the power the built-in remote. Why? |
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Post by Decibel on Aug 10, 2015 7:21:39 GMT -5
I will check the EHT board.
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Post by Decibel on Aug 10, 2015 7:44:42 GMT -5
I will check the EHT board. A resistor named SR3 on EHT board seems broken. It no appear burned but the meter no show value. Service Manual say R CFFH 1E J 0W25 |
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