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Small Squiggly interference lines on NEC XG 1352 ??

9197 Views 283 Replies 23 Participants Last post by  Gary Murrell
Guys I got my new NEC 1352 in the other day, been working on him for a few days


I have one major issue right now


the 1352 is showing faint small squiggly interference lines, sometimes they alternate between tubes, sometimes they are on all 3, the blue seems to be the worst


the lines are very small and are horizontally across the screen and at a slight angle

they travel down a inch and up a inch, very fast moving back and forth, they do not deviate from that movement


I can see them from my seating distance of 1.6 times back


sometimes they are bad, sometimes they are only faintly on the blue


Any ideas guys as to what this could be ??


I have left my sync's connected and unplugged the color lines, they are still visible on the raster with brightness cranked


I had also tried a cheater ground plug


Thanks for anyones advice or help


-Gary
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Gary I don't know what causes that but congrats on yout new puppy.

HAve tried anothe outlet and/ reseating some of the cards. Check your input line like contact points etc.
Gary, have you tried a power conditioner? You may have some high frequency noise on the AC line to the projector.
might of been the huge salad fork ups tried to insert :)
no it was the forklift damage, that got the case and was within inches from destroying the unit, it seems to be in 100% perfect working condition


Caspian, I have tried 2 different outlets, one a dedicated circuit and outlet, haven't tried a conditioner yet, I think I have one around, a 400$ monster unit from a few years ago


I will try resetting all the cards, I think I did half of them already when checking the unit out after the back upper right panel had been hit


this is worse at sometimes and better at others, but it IS visible from my seating, if you know how to look for it


-Gary
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What is your input source?


Have you tried different resolutions, moving the input to another line and porches if you can adjust them? Is the phase set? Are your convergence controls within normal limits, are you using point, did you disable it?


Deron.
Ok, I'll take a stab at this. XG's have always been known to be noisy. My G70 has this slightly as well.


I have been told that a power conditioner can do the trick. The G70 has one built in believe it or not hence why I say it's slight.


I will ask my buddy at little guys about this. He is into this kind of stuff and when he had his XG, he ran one on his. I will find out the model.


Cliff
thanks Cliff, Deron


Ok, it seems to get worse with higher resolutions(and worse with progressive ones at that), I am running 1920x1080i in 2.35:1 raster right now


I am using no point, I normalized all those in my memory block and didn't touch them(That darn XG convergence is a bear and I still haven't got it figured out yet :mad:)


input source is VP30 via RGBHV, my Moome DVI card is coming today so I will be using HDMI > DVI from the VP30 after it arrives(Thanks DVD Man ;))


the VP30 does have porch adjustment, I have just started learning the NEC over the past week, the shift control moves the image in the rasters, so I have adjusted that correct


I have adjusted convergence phase also


Thanks guys, I will try all these suggestions


-Gary
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Cliff, video noise is a residual background noise. In this case there is a strong line noise. XG ver. 2 actually has a clean output.

Gary it seems there is something buzzing in a single frequency somewhere. It may not be audible. I have no idea what I am saying. I hope it works out for you.
Quote:
Originally Posted by Gary Murrell
no it was the forklift damage, that got the case and was within inches from destroying the unit, it seems to be in 100% perfect working condition


Why didn't you go and pick it up or meet halfway?


Ericglo
Quote:
Originally Posted by Ericglo
Why didn't you go and pick it up or meet halfway?


Ericglo
because I am a friggin moron and my vehicle is nut up to snuff :mad:, plus school finals etc.


Caspian it has to be something fairly simple, maybe not, it seems to be getting a little worse


I have also been told by many folks that the 1352's much cleaner, I can't tell though right now because of this issue


the lines have a halo around them and move very very rapidly up and down really fast, they aren't looping, the just move up and down a inch or two up and down


to update I removed and reinsert all the cards in the unit, no dice :(


I added a power conditioner, no dice :(


I changed my source today from RGBHV to the Moome DVI card, using it's DVI input, no dice :(


I carefully positioned the video leads from the back to the neck cards, keeping them away from everything else, no dice :(


tried cheater ground remover plug, nope :(


-Gary
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I found someone in the archives with my exact problem :), almost 100% identical, it changes from tube to tube and the amount as you change to different frequencies, my lines are much much smaller though

http://archive.avsforum.com/avs-vb/s...ighlight=lines


the poster never followed up though :mad:


-Gary
I can ask JSP if you like - but his PKlus is dead currently - that PJ had lots of issues.


I know he had some noise issues caused by his switcher.
Let me assure you that there is not such thing with my 1352 and I see no noise even at a few feet from screen. Very clean picture. Sorry that you ended up with this problem. Did Cliff had this issue or just something new?

Perhaps Doug and some other Nec's guys with experience would jump in helping you out. It could be as simple as changing a board. Good luck.
Gary, you might want to also try resetting your linear-balance settings to 0 since they can cause banding. There are separate settings for RED and BLUE. The GREEN one is for alignment (global) balance. You get to it by hitting CTRL-LINEAR if you are already in SERVICE mode.
Wait till Doug shows up before doing anything drastic. Hope you get it squared away. I never saw this issue with my 1352, but then my 1352 was never attacked by a forklift either. :(


Do you have any pics of the damaged area and the surrounding electronics?
HAve you looked at you line voltage between ground and neutral? should read about .1v. It is long shot but should do it anyway.
What res are you running Gary? A few of the Aussie guys are now running really high res's (like 1440x1152 at 50hx for PAL DVD) which seems to minimise the XG video noise.
Quote:
Originally Posted by CZ Eddie
Wait till Doug shows up before doing anything drastic. Hope you get it squared away. I never saw this issue with my 1352, but then my 1352 was never attacked by a forklift either. :(


Do you have any pics of the damaged area and the surrounding electronics?
Here ya go CZ......

http://www.stbh.org/cliff/xglc1.jpg

http://www.stbh.org/cliff/xglc2.jpg

http://www.stbh.org/cliff/xglc4.jpg

http://www.stbh.org/cliff/xglc3.jpg

http://www.stbh.org/cliff/xglc5.jpg


Looking SO MUCH FOWARD to dealing with this as well as the nightmare Bruce and I are having right now with the Marquee 9000.


Cliff


P.S.


Damn I wish I could get close up's that good!!!!
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those pics make it look worse than it is and thats a good thing ;) :D the sheet metal was just indented slightly


Guys this issue was most likely not on the PJ when Cliff had it, he was running much higher resolutions also and may have never encountered it


I am going to check some more resolutions right now and see what gives


Eddie:


the forklift attack on the pj was within inches from being drastic, but the actual damage was only the back plastic piece, I was relieved when I opened the pj up and inspected, damn UPS freight come within a fleas ass from ruining the unit :mad:


I think it was a very minor bump of the fork lift in the very top right hand corner


Mark, thanks I would love to hear if he corrected the problem, I am running 1920x1080i/60hz in a 2.35:1 sized raster, I have tried a 16:9 and even 4:3 raster, the problem is still there, I have nothing in my chain but straight from the scaler(VP30) of RGBHV or DVI, neither outputs showed anything wrong on other CRT units


the VP30 has porch settings, i tried making them smaller and larger, no help


Jerry I have deleted all the memories and started fresh, 3 or 4 times already, everytime it is still the same


I can say for sure that with 1080i the blue tube is bad and is the worst, like the archived post, it changes randomly andis different with each resolution


Caspian, please inform me how to safely do this and I will be glad to do it, me and juice for some reason don't like each other ;)


thanks guys, we will get to the bottom of this because I don't give up :)


-Gary
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