Hitachi tweaks Q&A thread - Page 6

When preforming the calibration should the ISF calibrator adjust the gray scale using the trimpots, or does it matter at this point?

Thanks!
However, the trimpots are out of adjustment now! The SM values have not been modified.

ty marc i found it on cd rom for 9.50 us dollars!! now if i could only find someone to upload it to my ftp server......for free...heh

Marc and steviec, (Color trimpots)
I had a ISF service guy over last night for more than (3) hours, he was not able to properly set the output of the color trimpots correctly. He suggested that I have a senior technician from the mfg. come out and balance the crt outputs, which will allow the correct temperature settings for gray scale to be made. Does this make sense?

You cannot use the screen trimpots alone to correct grayscale. They act identical to the CUTS in the service menu, which means you are not correcting the upper IREs. What they should do is set the trimpots per the manual and adjust grayscale by using the CUTS and DRIVES.

Bill

Thanks!
He was able to set the gray scale to the following: 30 IRE=6436k, 50 IRE=6454k, 80 IRE=6487, but when we put the 5th element dvd on, the whites were better than ever, but had unacceptable green push, so we started over and over. He did not have a SM.

Wow, your service tech had a color analyzer? However, it sounds like he didn't know how to use it. You can obtain 6500K without hitting D65 (the appropriate 6500K). You cannot rely solely on color temp. You have to use the cooridinate system to determine the appropriate 6500K (D65). It sounds like he was a little high on the Y axis (hence the green 6500K).

Bill

That sounds pretty good but the hardest window to set is the 20ire.
The excess green should be fairly easy to fix.
Did he setup the color decoder properly?

No! He said i should have the Mfg. SMan do that, and decoder setup is not part of the standard calibration service. Just a little history on my set. The initial trimpot adjustment were done by a local Mfg. approved service center, he told me he was going to improve the picture sharpness and focus, from that point, (3) service calls and last nights calibration, has not resolved my sets problems.

Hi gang - great thread! I have around 30 hours on a new Hitachi 57s500 and have improved the picture immensely with info on this thread and others. A couple of problems:

1. I haven't been happy with the results from the Magic Focus convergence auto mode and decided to do a manual mode convergence. This worked well except for some reason the convergence won't hold for more than an hour or two before drifting off significantly. Although I don't have 100 hours on the set as suggested by some berfore making this kind of adjustment, with 30 hours logged on the set, I wouldn't expect the convergence to drift so significantly in only a couple of hours. I've done this a couple of times now with the same results each time. The set was warmed up for several hours before doing the convergence, and also, the last time I did it, I removed my speakers from the area just in case speaker magnetic fields were causing problems.

2. A different problem is that on a grey or white screen, a slight but noticable pink hue is present on the left side of the screen, fading away gradually from the left to the right side of the screen. It is slight but present even after a manual convergence calibration.

Has anyone had either of these problems or have any ideas on what could be the cause?

Larry

Thanks Marc - I agree. Last night, I did find a changing magnetic source that might have affected things - a subwoofer several feet away that I didn't remove from the room when I removed the two other speakers nearest the TV in my last convergence test. The subwoofer cuts on and off as it detects a signal. I set it to stay turned on last night and so far, the last covergence seems to be holding pretty well.

How about the 2nd problem I mentioned: slight pink hue on left half of the screen noticable on all white, grey, or dark scenes - any ideas on this one? Is this a normal artifact of the CRT RPTV or is there a tweak or adjustment I need to do?

It's normal ...caused by the position of the red gun. Do a search on lens striping. I dont recommend you do lens stripe untill you're more familiar with the inner workings of your set.

Paul - thanks, I wasn't familiar with lens striping. I think I'll leave this problem alone for awhile!

Larry

I have a 12" subwoofer a few feet away. Will this effect my display? and if so how?

Not if it's properly shielded. Most newer subs are. My energy 12" sits 3" from my 57s500 ...no effect.

Marc,

I paid 350. Before the service calls, my 57uwx20b had great color.

Hmmm...a minor criticism of this thread. IMO any discussion about making service mode adjustments should at the very least provide instructions for how to enter the service mode and how to navigate it (unless it is logically laid out: on front projectors it usually is and on TV sets it usually isn't).

That info may be here, but if it is it is burried somewhere.

I know the information can be found elsewhere, but people looking for tweaks are more likely to happen upon a thread such as this, and then have to do more searches to find basic service mode information. It's better to have all that here, it seems to me.

--Jerome

Or is it what is right about Americans?

Sometimes folks follow a link into the middle of a thread, then becoming interested, they ask for more info.

Or maybe they are a relative newbie and don't know the in's and out's of forum etiquette.

Either way, we were all new once, so give a brother a chance!

By the way, Mr. Alexander's quoted link will be most helpful! By the way I'm not meaning to tear on you Mr. Alexander, just the premise of us "Lazy Americans!" Heck were getting all fired up about how to be the ultimate couch potato!

I cannot agree with Marc more... Spend a few minutes and even type something in the search box. There are about 3-4 threads specifically on the Hitachi CRT's, The are posted on the most popular threads at the top, each one points to the other threads. I mean the only thing we could do is everyone can put the SM procedure in thier Signature ....

chris

Ok, so we are lazy couch potatoes. We spend a small fortune on TV sets and sophisticated remotes so we don't have to even press too many buttons. And to what end? To lay on the couch and watch our favorite movies and sports.

To complain about folks within that genre as being lazy could be a tad disingenuous

You know something guys, it was an honest mistake. Instead of being gentlemen (and this goes for you too Marc), you decided to take personal offense at what was intended to be an honest critcism, one that I said at the outset was minor. Thanks for making a mountain out of a molehill.

Furthermore, you are way out of line with the lazy remark. I've been around here longer than you have Marc, and have made my share of contributions to AVS Forum, so you are barking up the wrong tree. I appologize for having missed that one word hyperlink. A simple "please check the hyperlink in the first post" would have been sufficient. If it pissed you off that much then you could have simply ignored it.

Whether you agree or not,

Hitachi 51F500 Tweaks Thread

is more attention grabbing than

here

Sorry to have bothered you.

--Jerome

I'm not unsympathetic Marc. You should check out the Windows Media 9 HDTV encoding guide in my signature. That guide took over 200 hours of my time to write, and considerably more than that to do the research and testing. It didn't take long for my PM box to overflow with requests for information...information that I had painstakingly put into the guide. It got to the point where I had to back away from it for a while because it started to take up all my forum time. As it turned out that was a good thing, because people then started using the guide because they had no choice. That thread is at something like 550 posts, so can understand how someone new to the discussion might have a hard time playing catch up.


Mainly because I thought it would be helpful to have those instructions in the same thread (keeping in mind that I missed the hyperlink), but secondarily because I just bought a Hitachi 65S500 and was searching the forum looking for those very instructions for myself. I know my way around a CRT display (have lots of CRT FP experience), but need to familiarize myself with the Hitachi service menu. I do plan on getting the service manual, but for now all I want to do is an eyeball grayscale since this unit is very green heavy at the bottom. I found the information I was after over at HTS, so it isn't a big deal. Think of it as a request rather than a critcism, and that is how I should have worded my post. Poor choice of words on my part.

--Jerome

--Jerome