CurtPalme.com Home Theater Forum

Yoyomaverick · Joined: 13 Mar 2024 Posts: 4 Location: Greenville, SC

Hello all! I am new to CRT projectors and this forum, so my apologies if I ask a dumb question. I have acquired a Marquee 8000 projector a couple days ago. It had worked without issues the last time the previous owner turned it on, about 8 years ago. The timeline of what happened is a bit complicated so I will break it down, and I apologize for the wall of text.

Yesterday scenario one:

When I plug it in and power on, the LVPS LED at the back comes on, but none of the LEDs on the LVPS itself come on, after a few seconds, it reverts to standby mode.

Yesterday scenario two:

If i try to power after Yesterday scenario one without unplugging, the same LVPS light comes on briefly, then turns off and the status changes to power, but then the H fail light comes on.

If i power off and back on without unplugging it, it skips Yesterday scenario one and goes to Yesterday scenario two, with the H fail light on.

If I unplug it, it reverts itself to Yesterday scenario one, and the cycle repeats itself.

I took the H board out and made sure the main connection was clear, The REALLY interesting thing is that as I was typing this, when it was on Yesterday scenario two, all error lights came off and I was able to get the help menu displayed. These are the new scenarios the projector is experiencing:

Today scenario one:
If the projector is unplugged and plugged back in, then turning on will result in Yesterday scenario one occurring, then quickly moving onto Yesterday scenario two, then after a while, the error lights turn off and the projector seems to work as it should and I can display the help menu

Today scenario two:
If the projector is turned off from the end of Today scenario one, then turned back on WITHOUT unplugging, no errors are displayed and it seems to start up as normal, no error lights and I am able to display the help menu

Please note that currently both Yesterday scenarios are not occurring anymore, only within the context of Today scenario one.

Could all this have been the result of the projector sitting for eight years? If so, how? It seems to have a perfect startup now if I keep it plugged in, so maybe I shouldn't be concerned anymore? I apologize for the length of the post and deluge of questions, and I greatly appreciate y'alls time.

**Curt Palme** · Posted: Tue Mar 19, 2024 6:30 pm Post subject:

Wow, 8000s are still out there!

These pretty much are now the Ford Model T of the CRT industry, so keep that in mind. First thing would be to replace the memory battery on the controller board. They are long discontinued of course, but any 3 volt lithium battery will work.

I'll bet most of your problems will go away with doing that.

Yoyomaverick · Joined: 13 Mar 2024 Posts: 4 Location: Greenville, SC

Thank you very much! Will do that ASAP. I was pretty surprised when I got it too. The phosphor on the red and blue tubes appear to be practically virgin, and the green maybe 1/3 through its life. Do you think it would be a good idea to plug this up through a UPS to possibly extend the life of the power supplies? I've always heard you do this with expensive PCs, but I was wondering what your perspective was on the CRTs.

**kal** · Posted: Tue Mar 19, 2024 10:57 pm Post subject:

**Curt Palme** · Posted: Tue Mar 19, 2024 11:51 pm Post subject:

What Kal said. Even a surge protector power bar has nothing more in it than the Marquee supply already does.

Yoyomaverick · Joined: 13 Mar 2024 Posts: 4 Location: Greenville, SC

The way I've always heard it (please correct me if I'm wrong here), was mostly because Line Interactive UPS's will clean up the electricity coming from the wall. As I've heard it, normally, the electricity coming directly from an outlet is not a consistent 120v output. You can have brownouts or other small irregularities. Neither of these issues are catastrophic to a power supply, but I have heard they do wear and tear to it. Whereas, a Line Interactive UPS will ensure you have a much more consistent power flow going to the end devices, I believe Eaton calls this "Pure Sine Wave Power Output". I have attached a link below. Eaton seems to only recommend it if you attach sensitive electronics to it, but I was wondering if this might help extend the life of the power supply. My apologies, I should have specified the Line Interactive type of UPS.

https://tripplite.eaton.com/products/ups-types

**kal** · Posted: Wed Mar 20, 2024 12:25 am Post subject:

If you have a device that needs exactly 120V then sure, that may help. As an electrical engineer I will say, if any device needs exactly a specific voltage it should have that sort of circuitry built in to compensate for that. That's always built in when required as main voltage will vary.

A Line Interactive UPS make make sense if you absolutely must run equipment in brownout (low voltage) situations. Like life saving equipment. Not required with consumer electronics. No company in the world producing electronic/electrical devices will also tell you "our electronics are very sensitive and we haven't built into it anything to compensate for that so we really think you should put a line interactive UPS in front of it".

Keep in mind you're running a projector from 30 years ago that isn't worth anything today. While I don't feel it protects anything looking at how the power supplies on CRT projectors are built, why would you spend more money to protect it in the first place?

Kal

Yoyomaverick · Joined: 13 Mar 2024 Posts: 4 Location: Greenville, SC

Ah, I see now. In hindsight I suppose I asked a pretty dumb question. Thanks for clearing that up!

km987654 · Posted: Wed Mar 20, 2024 7:15 pm Post subject:

Basically whats been said.

I use a UPS on my system and have done so for years. When power is interrupted it may not be just a case of one power off and on it may go off and on several times before it settles down. I don't like that for my projector especially considering the HV elements of a CRT projector.

Not saying its necessary but its at least a nice to have.