Don't dump your CRT RPTV! - Page 373

Pioneer, yeah i wish Just a lowly hitachi uwx20b so i'm not sure how dirty the internal optics get over time.
I don't think this tv was used much either, after I cleaned off the lenses and mirror when I first got it I was quite shocked at how bright it was for a 10 year old display.

It's definetly the opposing side reflections that i'm getting, a crescent of sorts can it be mitigated with duvetyne or felt or is it likely to be within the lense casings?

Having never owned one of these displays before i can't really tell you if it's bleary, i know it was pretty bad when I got it and it's alot better now, i don't expect the world out of crt's for static contrast but it beats the px80u plasma i had for dark room viewing.

"Or you could have simply goosed up the master sm brightness a bit instead, which affects all 3 colors automatically."

What's the master sm brightness? All i've touched in the service menu is the cutoff and gain controls. I should also mention i'm calibrating for slightly purple tinted glasses so there will probably be some imbalance.

"Yes. At the same time it does not compare with the huge improvements made by full blown optics cleaning."

I'm a "try the easiest things first" kind of guy I'll probably end up doing it eventually though.

"I coulda told you that"

It seems like they went overboard in the improvements they made to the crt so they could perform at such a high brightness, I see single tube crt's dimming to nothing left and right so it was definetly a pleasant surprise

"Expect.

There's nothing better than CRT for contrast ratio, whether you're talking static or dynamic. If yours is not cutting it, we need to talk."

That's a very long and complicated topic For my viewing environment and preferences crt's fit the bill pretty well, but alot of people like more brightness than i do and crt's static contrast seems to fall of exponentially as the brightness rises and the bright areas cover more of the screen, whether the human eye can detect benefits of the display tech in those circumstances is certianly up for debate.

So is felt likely to help mitigate these detail eating crescents or is it something that's buried in the optics?
It sounds like something that would take alot more work to improve: http://dgibbons.members.sonic.net/essay7.html

I'm surprised manufacturers didn't work harder to mitigate it.

An example of the kind of content i got this screen for: http://www.pcgames.de/screenshots/original/2011/12/Dragon_1.jpg

Oh your talking about the basic menu video controls? Yeah I set black level to where a black screen nearly blends into the darkness for dark room viewing.
Contrast is usually set around 30.

So will felt lining work to mitigate lens flare crescents or are the reflections within the lens casings?

Yeah the article i linked a few posts back talked about minimizing them by using an anti reflective paint inside the lens casings and on the edges of the lenses, sounds like something that's really easy to screw up leaving me with a 240 lb paper weight ;p

So if i'm following correctly, dirty internal optics will cause a haze around brighter objects and a decrease in brightness, where i would then turn up the contrast to compensate and lose black level performance in doing so while doing nothing for the haze.

Lining the cabinet will only get rid of some misplaced washout of dark areas upping the ansi contrast not doing anything for crescent shaped reflections that start inside the lenses.

I'm guessing that i'm calibrating for what most would consider a very low contrast setting which in turn will cause some crushing of detail near black, i've been trying to mitigate it with the cutoff controls but if say the screen controls were maybe set slightly to high (dimly visible up close in a dim room) would that cause the scale to crush some detail near black making it impossible for me to achieve true black without crushing close detail?

I once found a bug in mine, so there's plenty of room for dust.

And it's no big deal. Take it slow, one lens at a time, and get some first-hand advice from Bob.

Michael

Hitachi 57F59A

"Skinny"? We got a whole damn thread:

http://www.avsforum.com/t/1010146/rpcrt-reference-material-color-decoding/960

Yeah I certainly could have done worse for 0$, I almost bought a Samsung and a Philips both priced at 100$,
I only read later about the frequent gun death of Samsung's and coolant contamination of the Philips.
I certainly hope the Pioneer elites are better though, considering what people paid for them.

Yeah there weren't to many other options, i think it was down to a Sony from 2004 a Panasonic from 2003 and my hitachi from 2002. I had heard good things about the Sony's and good things on this thread and elsewhere about the Panasonics but all i had to do to get the hitachi was walk in and take it where as any other tv i was looking at was right around 100$.

You mention tests to see if deeper optics cleaning is needed, can you divulge one or two or are they trade secrets?

I didn't want to come off as a prick or anything and it's perfectly fine if you want to keep some information to yourself. I did indeed get an incredible deal and I appreciate that, hopefully I'll keep this tv running and eventually pass it on to someone who will do the same rather than the guy I got it from who couldn't have cared less about it. The poor sap who bought it new bought in a time when their was nothing else out there that could compete in any area, be it picture quality, value or even power draw. He also didn't have to carry It up and down flights of stairs and put 30 hours of work into it.

Considering I am currently broke until I finish the training for comptia a+ (and I mean 0$ broke) i can't afford things like phone coaching, unlike many who would simply hit and run I have tried to help others around the forum as much as I can with what little I know about other areas of electronics. That's about all I can afford to give back right now.

I would recommend to get a hold of the service manual. Research anything you want to perform to your tv.

Even then if you are sure what you are doing I would still recommend talking to Bob. He has invaluable knowledge that you can't find anywhere else.

Hitachis can be tweak to the max, the service registers have great flexibility, nevertheless this is not for everyone. It requires time and dedication to do it right. Like I mentioned before, if you want to get it right the first time get help from Bob, very well worth it.

Well maybe sometime in the future, but like I said, i'm broke :P

I picked up a service manual when i first got the tv, it helped out a little but this thread has been much more helpful.

I would love to eventually have my Hitachi tweaked to the max but i'm focusing on the little things right now that i have time to do while studying and that i can afford to do.

As always thanks for all the help

Good luck to you... in the mean time you should check the thread Michael posted. There are very good and specific ideas for the Hitachis there, just remember to always write down your starting registers before changing anything.

Thanks man, i'll definetly check out the thread.

I always take photographs of any service menu values that i change.

Good luck to you and thank you for your understanding as well. I'm hoping the a+ training will be my ticket into the electronics job market where I can work my way into other areas as well,

Mr Bob,

Any chance you have the Factory directions on how to split a Hitachi 65T500 in two? I know the top comes off somehow and I need to move mine from the downstairs to a friends house without breaking it. It has served me well for almost 9 great years. If I can't remove the top half I will have to junk it to get it outside. It would be a shame as it is STILL an awesome picture.

Thanks in advance if you can help,

Joe

I have parts available for a Mitsubishi WS-65903. Unfortunately I am scrapping the TV, but prior to recycling it, I wanted to see if anyone is interested.
I also have both full service manuals, schematics etc.
Probably best if you emailed me.
zoidsmith@aol.com

I presume he's on YOUR side of the continent?

Michael