I watch laser disks on a CRT TV my laser displayer is on top of my TV I have 2 speakers on there's on the left and the right both about 4' away from the TV. After watching a movie for about 10 minutes I can see discoloration in the picture when I hit the pause button the blue screen from the laser disc and you can see a definite discolor on the screen it goes away after about 25 seconds is this normal? for an older TV? The discolorations on the far left edge and the upper right corner where the TV would say pause.

Hi, it sounds likely that your speakers at only 4” are located much too close to your CRT TV screen and the magnets in the drive units are causing the problems. I’d move them further away pronto before any permanent damage to the tube (if it hasn’t been done already?) is caused; also using the top of the TV as a base for a LD/DVD or similar player is not the best location either, hope this helps.

I will move the speakers but they are 4 feet away not inches and I will move the laser disc player it only happen when I watch laser disc though I play nintendo and watch antenna TV on that screen thanks for the info!

Ah, my apologies - should have read more carefully and I can’t blame my glasses either as I’ve just purchased a new pair

Could still be caused by the close proximity of the LD player though, so hopefully moving it away could help, good luck

I'm dying here.
Why do you have the LD player on top of the TV, its probably causing some magnetic field when spinning up.

Move your player, shouldn't be on top of the TV anyway.
Hope you enjoy older tech.

Search up the magnet around your CRT tube its fun.

Discoloration on the corners can be attributed to the degausing circuit not working properly in the TV (maybe cold solder joint on the board where the degausing band plugs into it). Also, how big is this CRT? If 35" or bigger, these sets also had an orientation switch to compensate for North & South Poles affecting the picture.

As for the player on top of a TV, that usually wouldn't cause that kind of problem. Worst case on some players is that a moire pattern appears on the screen when the player is left on and the TV is on the tuner (RF Input).

OK so I moved the laser displayer the speakers are about 4' away from the TV it's from the TV it's a 35" which has a North South on it I haven't faced in the right direction when I watched laser disks for about the 1st 10 minutes it's still discolors on the left side of the screen and the right corner I'm starting to think it's just my TV warming up possibly but I played nintendo on it and watch regular TV and it never does that so I'm lost

I'm wondering now if it was stored or moved wrong and as ldfan said the circuit inside isn't working right.

But even if it is a magnet, the LD spinning up or something else we can't figure without seeing it in person or even seeing it in person still may not be able to figure.
You can fix if it is the magnetic deal but should be very careful to make sure that's the issue before otherwise you will make it worse.

Are you using Svideo or what cables? Have you tried to change cables, it may be easier to swap a cable than start messing with tweeking if not needed.

But if this is on LD only I would say its more of a cable or another issue and not the magnetic field degaussing issue.

Are you sure you don’t see any discoloration on the antenna and game system?

You did mention having the LD player’s blue screen up to easily see the discoloration so maybe it’s still there on the other two sources but you just can’t distinguish it because there is no blue screen.

Also, 35” TVs’ are notorious for these kinds of issues. I recall a fairly low end Mitsubishi (possibly a CS-35205) that was particularly bad with corner discoloration and I suspect it was due to not having enough magnetic shielding around the tube.

In regards to degaussing, you can test if it is working as there is a manual degauss button in the front that you can press to see if that does anything. You will see the picture compress a bit for a second and that means the degausser is working. Also, the polarity switch does have a position called neutral and that should be set there if the TV is facing either East or West.

so I am avi cables. I run it through a Sony receiver. after about 20
minutes it stop doing it, I feel if It was happening when I watch TV or play nintendo I would see it cause I see it when I watch LD it started getting really white in the areas of the screen that are discolored on the blue screen. also, I di pick this u tv up for free it wasn't being used but was taken care of the picture is awesome! I will say it is mitsubishi I know it's a higher end ( or so i thinkas it was mad in1995 and the owner gave me the original bill of sale it was $2700 lol) with a deguass button.

BTW it's a mitsubishi ck 35304

So does the degauss button do anything to the screen?

it deguaess the TV as on it looks like it's doing something lol but the color is still there and goes away after about 10 to 20 minutes I am starting to think it's my tv, I will check to see it is does that while doing other things on the tv.

You could always get a degaussing ring to see if that might fix the corner discoloration (or reduce it). Here is one available on eBay....

https://www.ebay.com/itm/284954193869?h ... SwMSFjE3w9

How you use this is that you wave this ring in front of the TV in a circular motion and back away slowly in the process of doing so. You may have to concentrate more of the wave on those corners to see if it will fix the issue.

However, I have seen these issues before and many times once they are there you can't totally get rid of it. It might be damage from some magnetic field @ some point in time (I think I recall an incident when working @ The Good Guys that some 35" TVs' were stored near speakers in a stock room and that was enough to screw them up).

perfect! thank you for the advice!

I think you really need to post pictures of your issues before you start with the coil.
Make sure you don't mess it up when it may really not need this, it could also need this but we are only going on what you are saying.

Just to be safe before you mess it up.

Update. So I figured out what was causing it, I would rather not disclose because I am an idiot! thank you all!

Oh I want to guess.

the AC behind the TV??

Sunlight coming in from the window near the TV???

Or some type of motor behind or near the TV like a fish filter????

C'mon you have to tell us.

I had a small a small digital alarm clock on top of the tv......TV....... it has a small speaker. I know I know.

Why do you have so much stuff on top of your TV!?