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Post by Decibel on Aug 10, 2015 8:44:40 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 Ok ... replaced resistor in the EHT board. Now the projector show light from the tubes. The blue flashing with intense light. The others seems shut down but when power off the projector I noticed also flashes from them. Absolutely no menu and built-in remote always dead. I'm going to check +/- CONV voltages with Barco's software. |
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Post by Decibel on Aug 10, 2015 9:02:34 GMT -5
YEAHHHHHHHHHHHHHHHHH  |
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Post by Decibel on Aug 10, 2015 9:06:42 GMT -5
The jumpers of convergences board are always remove.
Now I'm afraid to reinstall they.
The blue tube sometimes seems power off. When lit appear too high. Perhaps it have G2 too high.
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Post by Decibel on Aug 10, 2015 9:22:20 GMT -5
Thank you all for the support, but especially to the Mastertech for his patience and expertise  Now I must to solve the mistery of the dead of built-in remote and anomaly of blue tube. |
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Post by Deleted on Aug 10, 2015 16:58:04 GMT -5
YEAHHHHHHHHHHHHHHHHH Great Decibel! You did it. Seems you are an expert by now |
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Post by Deleted on Aug 10, 2015 17:01:17 GMT -5
The jumpers of convergences board are always remove. Now I'm afraid to reinstall they. The blue tube sometimes seems power off. When lit appear too high. Perhaps it have G2 too high. Keep brigntness and contrast low. Might be the protection kicking in. G2 goes automatically nothing you can adjust. Also make sure the image width and height is not to big. Keep the image within the tube face! About the convergence board. I would check the transistors close to the black resistor. The resistor might have survived but perhaps the transistors not. Q201 and D201 perhaps? |
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Post by Deleted on Aug 10, 2015 17:23:11 GMT -5
One mote thing you could try to figure out the blue tube problem is to change the neckboards and see if the problem shifts.
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Post by Decibel on Aug 10, 2015 17:30:04 GMT -5
Tomorrow I'll try other tests, included swap of neckboards.
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Post by mastertech on Aug 10, 2015 22:30:17 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. What I find here interesting is, with the jumpers removed, both conv + and - are high. So this would be free running voltages, even though there is a +con line that runs to the vertical board. Then with jumpers installed we "had" only the +conv high. This would most likely indicate that the +conv line is still free running. Now if SR1 were in fact still open then it may explain it. But with it having been replaced and still no change could mean that line is still free running. Of course I have still not heard what the actual ohm readings were of SR1 and SR2. Anyways, this could mean you still have a failed component "after" SR1 which could be why SR1 was overheated. Meaning, a component went short and SR1 started to overheat and then the shorted component blew open. So this is my thought as of now but the 2 jumpers must be installed now and I need the ohm readings of SR1 and SR2. As far as the flickering blue, it could be a dirty pin on the CRT tube, a bad neckboard or solder joint on it or even the tube itself. So changing a neckboard would be a first good try but at that same time I would push that neckboard on and off a bunch of times to clean the pins somewhat also. |
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Post by Decibel on Aug 11, 2015 3:30:15 GMT -5
The toasted resistor was SR2 in the -CON line. Not SR1.
However the high voltages was in both CON lines.
This evening re-check all voltages.
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Post by dummyload on Aug 11, 2015 6:11:04 GMT -5
I was on vacation the last 4 weeks (no internet or phone) so great to see the beast has come to life. I assumed that your spare smps was a good working one.
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 .
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Post by mastertech on Aug 11, 2015 8:46:32 GMT -5
The toasted resistor was SR2 in the -CON line. Not SR1. However the high voltages was in both CON lines. This evening re-check all voltages. Have you checked it with the jumpers back in place? You had said that the over heated resistor still tested the same and the other one. And I am assuming you do not remember what those reading were cause I still do not see that posted. |
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Post by Decibel on Aug 11, 2015 8:52:13 GMT -5
I tested the resistor SR2 in his place. With jumpers. Then I tried to test pulled from pcb.
Meter show value.
The resistor appear toasted but should be good.
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Post by Decibel on Aug 11, 2015 8:53:18 GMT -5
When I said "tested sr2 resistor" intend with convergenge tray pulled. Projector power off.
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Post by mastertech on Aug 11, 2015 8:56:51 GMT -5
Meter showed value but you don't remember what it was? Resistor appeared toasted but you replaced it anyways, correct? This last picture you posted of all the voltages was with the jumpers removed, correct? |
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