CurtPalme.com Home Theater Forum

[CasetheCorvetteman]

This could be why your fans spun faster earlier in the piece? Mine almost never do!!

[CasetheCorvetteman]

Curt, what could be the downside to running this P1 voltage higher??

Tjeerd, are you at 18v on the 31.5kHz pattern? Thats about where i wound it up to.

[redfox001]

[redfox001]

[CasetheCorvetteman]

Mine is well covered, its not the quad arcing. Ive had that twice, different squeal sound and different on screen issues

[redfox001]

There seems to be nothing in the EHT or the PFC that is regulated by this 17,3V but the PFC does regulate itself in some complicated manner. I measured 325V now while it used to be 370V and the specs say 380V. The 17,3V is on 18V now.

Hope Curt knows if there is a danger in this situation. Don't think so because Eltopo would have been around more

[CasetheCorvetteman]

Well mine was on 18.86v since ive had the set, so if there was youd think it wouldve come up now.

[Curt Palme]

Ignore the voltage charts in the Barco menus, they are a bit meaningless, other than to tell you that one is way off, in which case you usually don't get a picture.

I've seen the 17 volt test point vary +/- a volt or so, it seems to drift more than other older Barco sets.
The onscreen voltages are probably +/- 20% or so, which is why I ignore them. THey can't be individually adjusted anyway, the only adjustment you have is the 17 volt trimpot for all of them.

I don't think too high a voltage can cause an issue, as long as the voltages of the electrolytics isn't exceeded, which I don't think you can do.

All I'm interested is the streaking changes as the voltages change.

[Curt Palme]

Ignore the voltage charts in the Barco menus, they are a bit meaningless, other than to tell you that one is way off, in which case you usually don't get a picture.

I've seen the 17 volt test point vary +/- a volt or so, it seems to drift more than other older Barco sets.
The onscreen voltages are probably +/- 20% or so, which is why I ignore them. THey can't be individually adjusted anyway, the only adjustment you have is the 17 volt trimpot for all of them.

I don't think too high a voltage can cause an issue, as long as the voltages of the electrolytics isn't exceeded, which I don't think you can do.

All I'm interested is the streaking changes as the voltages change.

[redfox001]

Yes watched a very long movie 'transformers 4' and no streaking at all during the whole 2,5 hours Also the Max became very quiet in time. The lowest voltage seems to resonate a bit more in my case.

Have to add that the internal moome had much more visible streaking than the external vga and that is I think because of the different contrast settings. A few days ago I watched 'the signal' and the streaking was very bad in that movie. Now there is nothing.

One other thing the streaking got less when I exchanged the 300/380VM cap with two very low esr 450V/105c 47u caps. That already made the streaking appear in less scenes. But one movie that I keep for test (never watched it so bad) still very clearly showed streaking during the opening scenes where a camera in the desert is directed to the very hot sun and you see the sky. Than I raised that voltage to 18V or close and it was totaly gone. Have not seen it in any movie since so I call it solved but you never know


As I don't know any testpictures to bring out the streaking I recommend 'Swelter 2014' the opening scene is the worst I found.

[CasetheCorvetteman]

I never had a streaking issue til i dropped the voltage, since i raised it again i have been fine

[redfox001]

When you look at the schematics Barco says the voltage from the mains should be 300V but the PFC produces 380V. A friend told me that if the schematics are not what is really there than Barco must have changed it later because of problems. I have the idea that raising the voltage gives the same power with less current. So bad caps will be less bad that way, internal resistance will cause less heating etc.

[CasetheCorvetteman]

Its quite possible i spose yes

[CasetheCorvetteman]

I cant for the life of me remember what OPTION 1 in the menus does...

Does anyone else know?

[ElTopo]

How many hours on your Cine 9's ?

Mine has about 1600 hours with new LUG's and i cannot see streaking at all.

You think it's related to the boards ?

[CasetheCorvetteman]

I dont have and never had streaking.

Mine has 6970 hours.