CurtPalme.com Home Theater Forum

[that1crzywhtguy]

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I'm afraid for my beloved projector!

This is going to be a bit of an odd one to describe, but bear with me if you will. To skip to the end a touch, it seems to be okay right now, but I'm very fearful of long-term problems.

Okay, so here is the whole story:

I've been having a lot of fun with my Runco lately, and it's been getting a bit more use lately. I've never used it heavily (i've only put maybe 200 hours on it max of a total 3200hrs), and I've always been very careful with it. Well, I've never been totally happy with how well the blue lens focused, but overall the picture has still been quite good. I had done some more reading, and found out about the focus pots on the inside. I also immediately read that I should be very careful not to touch the G2 pots, and not to get them mixed up. When I popped the cover open, I saw that Runco was nice enough to put a plastic guard that needs to be removed to even get to the G2 pots: smart. So, i fiddled with the blue, and VOILA! Super sharp and better than ever! So I proceeded to grab some sunglasses, and focus each pot looking right into the tube, then loosening the wingnuts and focusing the lenses. I was pleased as punch, because it looked better than ever.

So I sat down and started watching some TV for about ten minutes, when i heard a loud POP from the projector, and suddenly there was a red tint and red diagonal lines through my image! I of course kind of freaked, and shut it off. After a little while, i worked up the guts to turn it back on, but the issue was still present, and the red tint seemed to be almost pulsing. I got the cover open again, and thought it was a really big coincidence, but that it was time to inspect the G2 pots. I used a bit of nail polish to mark the starting positions, then turned the red down a bit. It seemed to look back to normal mostly, but then the red would pulse in a bit here and there. So I turned all three pots all the way down, and began to nudge the green up on a black screen till I saw it come in, and here I saw the diagonal lines in green too... not sure what those were coming from, but I edged it back down until it was dark again, then just a hair lower. Did the same for red and blue, and now it seems to be operating completely normal again, with the exception of a little red bloom when I shut the projector down. This last bit wouldn't be very concerning since I've seen this behavior very commonly in crt televisions and computer monitors, but I don't remember it doing this before.

That being said, thanks to my marks, I can see the red pot is set lower than it was before, while the green and blue ended up right where they were before. Although it seems to be operating normal now, I'm afraid to even run it, and just can't imagine what could have happened. I'm very concerned that something happened that has turned my poor baby into a ticking time bomb.

If anybody has ANY recommendations or experience or advice, I would be extremely grateful.

Thanks so much in advance!

TL;DR: Loud pop noise resulted in red gain going way up. Turned gain down and picture is normal, but afraid of long term problems.

P.S. Here are some images of the symptoms.

This is the screen showing a black screen. As you can see, red is definitely on, as well as the weird diagonals.
https://drive.google.com/open?id=1MYJG7xxAxa1w6ND04GmyM7cco0ve8fuq

This is the screen showing a blue screen. As you can see, red is tinting it and showing diagonal lines.
https://drive.google.com/open?id=1pADuW8GMoyCtovVw6OnQAfmDa-sZ2WNB


And finally, here is the little red light bloom.
https://drive.google.com/open?id=1Erowe4Q1pOWt5Dy319k4DskCjfIrkafP

[Curt Palme]

First, set your G2 pots properly, in the service menu. There are three green LEDS on the main RGB input board one for each color. IN the service menu, go into the G2 setting and adjust those G2 pots so that each green LED goes out. then see if you still have problems.

You had an HV arc somewhere that threw something off. It could be an arc right in the red tube, which is what I expect, and that changed the characteristics of the tube, throwing off the G2 balance.

It could also be a problem on the G2 board itself, or the red CRT socket/video amp, but most likely not.

[Curt Palme]

First, set your G2 pots properly, in the service menu. There are three green LEDS on the main RGB input board one for each color. IN the service menu, go into the G2 setting and adjust those G2 pots so that each green LED goes out. then see if you still have problems.

You had an HV arc somewhere that threw something off. It could be an arc right in the red tube, which is what I expect, and that changed the characteristics of the tube, throwing off the G2 balance.

It could also be a problem on the G2 board itself, or the red CRT socket/video amp, but most likely not.

[that1crzywhtguy]

[Curt Palme]

Then I think my guess is correct, you had an internal arc in the red tube, but that went back to normal now. That can happen due to impurities in the tube, don't worry about it.

The green LEDs should be right on the motherboard, about 2"/5cm back from the RGB input connectors.

[Curt Palme]

Then I think my guess is correct, you had an internal arc in the red tube, but that went back to normal now. That can happen due to impurities in the tube, don't worry about it.

The green LEDs should be right on the motherboard, about 2"/5cm back from the RGB input connectors.

[that1crzywhtguy]

[that1crzywhtguy]

[that1crzywhtguy]

In the meantime... Looks so good!!!

https://drive.google.com/file/d/18zSpBTGdIvFdFg7H5cPz-yhHDHpj8pSY/view?usp=drivesdk

https://drive.google.com/file/d/1NQ51FrCxmOT23n5dw6p00WGyPjfSW4w9/view?usp=drivesdk

https://drive.google.com/file/d/1q6hGtEXcMy3lbLNHUCIblY9ldFoxJw-8/view?usp=drivesdk