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Post by jaredjaric on Jan 11, 2021 9:49:05 GMT -5
HI Hulio,
Both fuses on eht and g2 boards are fine,
it is very strange that the g2 diagnostics indicates everything is normal.
I do not believe all three tubes failed at the same time, or even all the video amp on the neck board.
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Post by jaredjaric on Nov 2, 2020 15:02:44 GMT -5
My Cinema9 is being used as a test bed , and was working with all original barco boards two weeks ago. I always need this PJ to be in good normal condition to test boards and to harvest parts. I left it off for two weeks to attend to my regular day to day activities. But previously or two months ago ,this unit has a tendency to have no video , even if there are no scan fail indications. The G2 diagnoistics will have no red led and the rgb switcher board will respond to my remote and have green leds on and off. The solution was to keep alternately swapping the g2 diagnostic board to get it working. And so i thought it was all good to go. i used it for the next two weeks to check on my DIY splitters without suffering any shorts or scan fail. Then put back the original Barco splitter, double checked for the next succeeding days that all is normal, then left it off for the next two weeks until now. I have swapped out all the HV parts, and smps, and tried on another new barco splitter. Tried the g2 switch again and again. Decibel had an almost similar issue, for his situation it was the eht board. I have four good eht swapped in and still no go. it is as if the three crts are not connected to the splitter, though the splitter's sub board does measure 33.7 volts, and no red leds on all eht boards used. Hope the experts can help me on this.
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Post by jaredjaric on Sept 21, 2020 11:46:45 GMT -5
thanks Rob,
I was hoping it is not the neck board. Yes i do have the manual, and a tech person close by. He is old school as can be.
i was hoping it is somewhere on the RGB driver section.
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Post by jaredjaric on Sept 19, 2020 22:14:45 GMT -5
Hi again guys.
I now have another pj with g2 issues, one of the tube is overdriven and the raster is too bright with the G2 lines exposed.
it is all in the neckboards, after swapping all boards, from smps to G2 diagnostic boards,it narrowed down to the neck boards.
It followed wherever the tube this neck board connects to.
There is a trimpot on the neck board for Gain adjustments with a test point, is this safe to fiddle with?
What should be the voltage?
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Post by jaredjaric on Sept 16, 2020 10:28:31 GMT -5
Am doing it all for this.
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Post by jaredjaric on Sept 16, 2020 10:25:58 GMT -5
Thanks for the advice and heads up, i am happy that this unit is razor sharp again
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Post by jaredjaric on Sept 16, 2020 7:39:24 GMT -5
Can you post a video (youtube may be an easy way to publish it), so we can see how it shakes/modulates? Hi Robin,
The video can not show the glowing or modulation, but it shows it fully out of focus. i will send it via youtube and send the link.
And the good news is, the culprit is found, it's another failing splitter.
It now measures 33.7 vdc, and is quite sharp and very stable.
I will send pictures of the images later.
You were on it and i just never thought it could be a splitter again and again.
You could see on my old 2018 post, that i had this exact issue, missed out on the actual suspect again.
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Post by jaredjaric on Sept 16, 2020 7:33:07 GMT -5
Good to hear. Glad you got it worked out. Sorry i havent been around, i was going to say the only item that really causes that issue is the splitter, ive had a couple do that. Can not believe this, it is another splitter issue causing this.
on my recent thread , i was trying all other boards to close in on the situation, and never thought that this same scenario can happen.
everyone was right, it was all in the three HV section ONLY. and it was the splitter again and again.
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Post by jaredjaric on Sept 15, 2020 10:47:59 GMT -5
and another one ,whole image is blooming, also very shaky.
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Post by jaredjaric on Sept 15, 2020 10:46:41 GMT -5
here is the out of focus image
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Post by jaredjaric on Sept 14, 2020 14:56:34 GMT -5
it seems like a diode or something shorting
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Post by jaredjaric on Sept 14, 2020 14:55:27 GMT -5
yes swapped in four focus boards, it is becoming very strange. swapped three quads also.
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Post by jaredjaric on Sept 14, 2020 14:39:31 GMT -5
It should be around 33-34V, but stable, if the value is swinging, something in the EHT line is wrong. This is a feedback of 1:1000 of the EHT voltage. Robin I just measured it, it is very stable at 34v DC.
still can not focus well and the image is still modulating.
Lawrence
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Post by jaredjaric on Sept 14, 2020 14:26:07 GMT -5
Hello, That still looks like it is splitter-related... Do you have a multimeter? There is a coaxial wire on the splitter we can probe, giving the value of the EHT voltage. That can confirm/infirm it is EHT-related or not. But do so only if you are aware of the high voltage risks. Robin Hi Robin,
What should be the value on the coaxial cable ?
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Post by jaredjaric on Sept 14, 2020 13:56:21 GMT -5
Dear Robin,
Thanks for the reply, yes I can test it. What is the voltage i need to have ?
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