CurtPalme.com Home Theater Forum

[dvh99]

these are the 1s i used

[mp20748]

If your vertical or convergence board has the double resistors, there's absolutely No reason to change them out.

The problem with these resistors was the single resistors being used. Once they doubled them, that solve any drift or otherwise problem caused from the convergence board alone.

On my test unit, the doubled resistors solved the measured (test gear) variances that were noticed with the single resistors in place.

On my personal 9500 I'm using dual 1.5 ohm @ 1/2 watt each. I put those in before finding out that 90% of the drifting had nothing to do with the resistors if they were doubled. If not doubled, the drifting is more like 15 or 20% caused from single resistors.

back when I was checking for this earlier this year, I found the drifting to come from three different places.

1, circuit tolerance warm-up, which involved vertical, HDM and convergence circuits. The main being the HDM and its multi-pin connector.

2, coils and tube warm-up is also involved, but minor.

3, some of the rails have a different voltage reading after warm-up. Not sure how much that effects drifting.



So there is no one source for drifting. But what i did find to be a concern was age and mechanical centering to be the main problem. Being able to eliminate drifting on any of the three boards by simply swapping resistors is just not going to happen. nor would any number of caps play a good part in making the problem really go away.

It's really a combination of several things, and I'm sure Scott and some others would agree. I have a late model VDC marquee 9500LC Ultra, that regardless of all my efforts, it still requires warm-up.

I don't know of a CRT projector, nor has ever known of a CRT projector that did not require warm-up to deal with drifting.



The best solution to solve drifting if you already have the doubled resistors would be to remove all three boards from the rear heat sink. Clean the surface of the rubber-like heat transfer strips on the main rear Heat Sink, and then apply a lubricant or heat transfer substance on the strips. You'll notice right after doing that and re-installing the boards the difference in how much hotter the heat sink gets.

This method along with proper mechanical centering has been my best solution so far in solving a drifting problems. And depending on the age of the projector and hours on it, it's best to simply expect a little drifting, but deal with it by establishing a warm-up period before use.

If after the warm-up period you later notice drifting, it then you have a real problem. And if going after the problem. keep in mind, drifting involves a lot more than just the convergence board...

[CZ Eddie]

My ESR meter meter on my 16,000 hour unit measured no more than a 10% difference in uF between old & new resistors so far, on my LVPS. I only tested about ten so far.

Still haven't fixed my red convergence zone problem. May just have to suck it up and try another board.

Btw, the solder sucker sqeazy bulb sucks.

[mp20748]

[draganm]

[CZ Eddie]

Capacitors.
Mike Parker knew what I was talking about. I'm a little surprised you didn't pick it up.

And it's "You're". As in "You are".

[JOneil]

[draganm]