CurtPalme.com Home Theater Forum

gnnash · Joined: 10 Jul 2013 Posts: 216 Location: Lake Elmo, MN

After taking my projector down from the ceiling in February, I've finally gotten my theater to a point where I could hang it up again and watch a quick movie. I'm sure that my progress will slow down now!

Anyway, I'm facing an issue that I also saw a bit before taking the projector down, but didn't really dig into it and honestly forgot about it. It seems that when the projector is warmed up, it will somewhat randomly drip output on all three tubes for a very short period of time, no more than 2-3 frames or so. It's so rapid, that it literally looks like the blink of an eye. Happens simultaneously on all three tubes, no loss of focus, picture size variation, brightness variation or anything surrounding the events. Just an extremely brief loss of video.

Projector is a Runco DTV-1100 (Barco Data 1209s). I don't hear any ticking, arcing or anything like that when the flicker occurs. Unfortunately, it's not very consistent, and I just got the projector up yesterday, so I haven't gotten a chance to stare inside the cover to watch for flashing LEDs or anything of the sort.

I do seem to recall that this began after changing out the green tube. At first, I thought it was just a bit of arcing with the new tube, but it has never made any noise, and doesn't arcing usually involve a loss of focus or collapse in picture size?

Any and all help appreciated as always!

**Curt Palme** · Posted: Mon Aug 24, 2015 3:31 pm Post subject:

When it does it next, put up the internal test patterns or menus, and see if those do it too or if they are solid. That would usually narrow it down to a source or projector issue.

Also, reseat all the modules. This is a bit of a weird one, I'd suspect a video issue rather than an HV one.

gnnash · Joined: 10 Jul 2013 Posts: 216 Location: Lake Elmo, MN

Well, I didn't have a ton of time to check it out, but I did watch an episode of TV last night, and the flickering was there. Every time I paused the video to take a closer look, I never saw it... And come to think of it, I never saw it when converging the projector with an external test pattern.

I suppose it must be something goofy with my Chromecast...

**Curt Palme** · Posted: Tue Aug 25, 2015 6:34 pm Post subject:

That would be my guess.

gnnash · Joined: 10 Jul 2013 Posts: 216 Location: Lake Elmo, MN

Happy to report that you were right. Still kept seeing flashing on the chromecast, but I couldn't get it to flicker at all when paused or on another source. Tried to watch something on my raspberry pi with the same USB power supply, and it was unstable, rebooting constantly.

A-HA!

Swapped out the power supply, watched half a movie before falling asleep, and all seems well now.