CurtPalme.com Home Theater Forum

[Meemil]

Hey!

This is my first post here in Curtpalme forums and so far this place seems really nice! I didn't know that CRT projectors even existed half a year back so yeah, I'm beginner with these monsters. However, I've started studying and reading a lot on how they work so I guess it's okay for me to ask help at this point haha.

Basically, I received a VPH 1251q almost for free which is in pretty good condition (some minor wear on blue tube). I've been trying to get this thing up and running for few months now and it surely is hard. Everything goes pretty smoothly in the process except convergence of the red and blue.

So far i have:

- Set the PJ in correct distance using PJCalc and made sure that it's square to the screen.
- Set all the values to 128 (default).
- Centered and maximized the rasters.
- Done the tube toe in for all 3 tubes.
- Tweaked the yokes to get the images straight using minium amount of correction.
- Fixed the astigmatism
- Focused the lenses & done the lens flapping w/ the mod.
- Converged the green tube

The green looks really good right now, it's almost perfect and not much correction is used. However the other colors fail at the keystone/pincushion stage. For some reason the corner lines are weirdly bent and I can't get the keystone distortion uniform as described in the manual. Here are some pictures: http://imgur.com/a/Ys3Ih

Thanks in advance!

[Curt Palme]

Looks good so far! Can you not correct that with the 'zone' controls? A bit of misconvergence like that is normal with the key and pin controls, use the 'zone' controls for fine tuning. Judging from the pix, you've done a far better than average setup for a first timer!

[Curt Palme]

Looks good so far! Can you not correct that with the 'zone' controls? A bit of misconvergence like that is normal with the key and pin controls, use the 'zone' controls for fine tuning. Judging from the pix, you've done a far better than average setup for a first timer!

[draganm]

Sooo close, just one more menu to navigate,

oh oh oh , not so far to go

[AnalogRocks]

Yeah what Curt said. Use the ZONE to dial in the edges now. What you are seeing is likely causes by the offset of the tubes. I run a little ZONE on my 1272 no problems.

Looking great so far.

[AnalogRocks]

Yeah what Curt said. Use the ZONE to dial in the edges now. What you are seeing is likely causes by the offset of the tubes. I run a little ZONE on my 1272 no problems.

Looking great so far.

[Meemil]

Alright, I'm finally back after a little break. PJ's psu died out and I didn't have motivation to troubleshoot it until this week and believe me, I didn't think that resoldering few joints on the board would resurrect it

In any case, thanks a lot for the responses! The projector is now up and running with a pretty decent convergence! However, I am now facing another issue. Convergence seems to drift a bit, especially after turning it off. It's not a very big problem as the center positions of red and blue only move a bit from green, and it's not a big task to fix. It does drift more noticeably when I'm feeding 1080i 60hz signal to it via DVI though. Sometimes it gets so troubling that I have to start tinkering with the settings even during a movie. I was wondering if this is normal behaviour?

Thanks!

[gregstv]

Tinkering during the movie is one of the side affects of this hobby.
I don't recall my 1272 drifting that much. Let it warm up and then do the convergence.
When you turn it on again it should come back into alingment once it warms up. It will be out slightly when cold.

[AnalogRocks]

[AnalogRocks]

[jbltecnicspro]

Not to hijack the thread (you've got a great setup, OP - good job!), but I find that I have to push horizontal keystone out quite a bit to get the image to be square. What am I doing wrong? The projector is a G70 ceiling mounted on the PSS-70 mount and it's as flat as the stand will allow it to go, so there is a bit of an off-angle with the tubes and they're not squarely hitting the screen.

Also - what do people here do for lower ceilings? My ceiling is about 7 ft high (if that - maybe it's more like 6ft, 8 inches) and the PSS-70 adds quite a bit of offset to the projector. I was thinking about spreading out the unistrut and removing the feet of the projector, and using the screw holes to mount the projector, bypassing the need for the PSS-70.

[Meemil]

[Curt Palme]

Analog gives good advice, but I'm not sure why he says to turn the projector on without a signal present. The electronics runs the same with or without a signal, in fact, the tube face will get hotter with a signal present, so in case of any minute shifts in the tube housing due to heat, I'd run a signal during warmup time.

The only thing I don't agree with is that all white Sony warmup screen. I'd turn that off, as I'm not a fan of all white on a screen for any length of time, it wears the tube phosphor.

[Curt Palme]

Analog gives good advice, but I'm not sure why he says to turn the projector on without a signal present. The electronics runs the same with or without a signal, in fact, the tube face will get hotter with a signal present, so in case of any minute shifts in the tube housing due to heat, I'd run a signal during warmup time.

The only thing I don't agree with is that all white Sony warmup screen. I'd turn that off, as I'm not a fan of all white on a screen for any length of time, it wears the tube phosphor.

[AnalogRocks]

[AnalogRocks]

[AnalogRocks]

[AnalogRocks]

[ecrabb]