Marquee LVPS Problem? - AVS Forum
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post #1 of 9 Old 08-11-2012, 05:19 AM - Thread Starter
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While watching a movie this morning, the projector shut off.

The red LVPS LED is on on the rear panel.

On the LVPS itself, the 2nd from the left LED is flashing about once/second (my projector is ceiling mounted, so for some of you that would be "second from the right").

I don't think that the PS is necessarily bad as I took another LVPS and swapped it out and got the same LED flashing.

What should I try next?

Thanks!

Jeff
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post #2 of 9 Old 08-11-2012, 07:16 AM
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Try disconnecting or unplugging every module in the set save for the CLM. IN order for the bottom fans to turn on, which indicate that the set has gone from standby mode to 'on' mode (the green LED on the CLM will also indicate this), only the LVPS and CLM need to be installed. Everything else can be disconnected. A short anywhere in the set can cause the LVPS not to come out of standby mode.

Usually however, a short will cause the LVPS to pulse, so it is a bit unusual for a short to cause it not to come out of standby mode. ONce you've disconnected the module with the short in it, the fans should fire up, and the green LED on the back should come on.

Don't forget that a shorted wired keypad under the top cover can cause thil, so if you still have a wired keypad in the set, disconnect that as well.

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post #3 of 9 Old 08-11-2012, 08:48 AM - Thread Starter
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Curt - Thanks Very Much for your suggestions.

I disconnected the two big boards inside (horizontal and vertical boards, I believe), the two boards at the back of the unit, the video decoder modules and the wired remote.

It didn't make any difference :-(

I tried swapping out the CLM and with the other CLM, if I try to turn on the projector the "C" light on the back panel flashes (while I'm pressing the Power button) but nothing happens (neither of the two LVPS leds - back panel and on the lvps) come on or flash. But, if I plug the wired remote back in, then I get the
same symptoms I was getting with the original CLM.

Is it toasted? Is there something else I should be disconnecting and/or trying?

Thanks again for your help!

Jeff
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post #4 of 9 Old 08-12-2012, 07:29 AM
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Yes, disconnect and unplug EVERYTHING. CRT Sockets, focus board, HVPS, H board, etc etc. If you still get nothing, then either both LVPS have the same issue, or both CLMs have the same issue. Which model of Marquee do you have?

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post #5 of 9 Old 08-12-2012, 08:00 AM
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Curt your getting lazy:)
Second from the right ceiling mount is the +85Volt rail. the only 2 modules that share that rail is the Horizontal deflection (big upright card between Blue and green tube), and the 3 video neck-boards= Cards on back of tube inside gold cage.

I'm betting it's the video neck-board. I'll even put my money on the green one, since it's the hardest working. I bet the big power resistor solder joints are burned from the capacitor leaking (most common failure),
Might be one the Motorola transistors as well but unlikely. Unplug the green neck-card and see if machine powers up with no video or error lights

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post #6 of 9 Old 08-12-2012, 08:09 AM
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check for this

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post #7 of 9 Old 08-12-2012, 12:56 PM - Thread Starter
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Thanks - I'm going to check now. But, in the ceiling mount position it's second from the left....
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post #8 of 9 Old 08-12-2012, 01:09 PM
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yup, still the +85 volt rail, I mis-typed the location but did get the rail right.smile.gif
=2 from left floor,
2nd from right ceiling.

is the +85 VDC rail

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post #9 of 9 Old 08-12-2012, 02:32 PM - Thread Starter
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DRAGAN, YOU ARE AWESOME!!

I give you an A++ for remote diagnosis. It was the Green Neck Board (FYI - it doesn't appear to be the power resistor solder joint). But, I did swap in a spare neck board and my projector is back in business!!

THANKS - THANKS - THANKS!!

Jeff - smile.gif

PS: Curt, if I'd realized yesterday that I should have pulled the neck boards too, I would have found it even earlier - thank you for pointing me in the right direction.
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