samsung syncmaster projection failure

[DOOMDUDEMX]

hi i have a big crt screen that ive dropped in the floor while trying to move it.

when i tried to use it the projection wass all messed up.
i can still se that its the right things popping up on the screen but just not in the right position and everything is bouncing up and down.

so.. guess what...

i want to fix that problem.

here is some info:

the screens name is samsung syncmaster 959NF.

my largest problem so far is to get the cover of.

the third corner just wont budge.

what i want to know is what i have to have in mind when i have opened it and what could be the problem.

or rather if it is fixable.

for security reasons i already use an ESD braclet.

[DOOMDUDEMX]

no replies

i think i´m a little bit short on replies

well if you need pictures of the electronics i can get some for you but then i need you to tell me what you need to see in order to locate the problem.

i just wonder...
does anybody know if its any rotating parts used with the projection part of the screen because it looks like the image is rotating around a big cylinder and the rotation speed come in waves. like if it rotates easier on one half then the other.

and for those who want to know... i have got the cover off now

[HayZee518]

the color monitor uses two sets of centering electromagnets and six convergence coils. american made monitors use metal clamps to hold the coils in place. samsung just glues them in place. I'm afraid a whole centering and re-convergence is in order for you. you need a color bar generater, a test pattern generator and a gizmo called a burst petal generator.

[buckofdurham]

I would throw it out.
The damaged electronics can be turned fron a linear load to non linear load. This will cause visual and auidable static.

[DOOMDUDEMX]

too bad!

well thats too bad!

but i wont throw it though...

i never throw electronics out and i will do all i can to fix it.

but anyway... thanks for the replies!

[HayZee518]

buck, what the heck is a "linear load?" I never heard of that in electronics.

[pbc]

sorry! just injecting a little humor

[HayZee518]

pbc - the darth vader approach is humorous to the forum but not inclusive to the problem at hand. in the future please refrain from posting such nonsense.

[DOOMDUDEMX]

the color monitor uses two sets of centering electromagnets and six convergence coils. american made monitors use metal clamps to hold the coils in place. samsung just glues them in place. I'm afraid a whole centering and re-convergence is in order for you. you need a color bar generater, a test pattern generator and a gizmo called a burst petal generator.

do you mean that i can solve this or is it useless.

at least i found the two first things you mentioned but i couldent find the last one.

[HayZee518]

I had one of those generators I think its called a color burst generator. It has a small round scope face on it and leads for connecting to the three guns on the picture tube. when the color signal for each gun is properly set a pattern that resembles a daisy is shown on the screen and is used for proper color gun alignment. I'm thinking of "chronoscope" but that ain't right.

[DOOMDUDEMX]

what now?

so what do i do when ive got all the stuff??

i guess there is more than software needed to repair the screen.

i suppose i will have to adjust someting "physically" in the screen too??

[DOOMDUDEMX]

still need help with this!!

come on!

there havent been a post in this thread for a while now can somebody please answer.

[HayZee518]

ok the way a crt is put together - a colr picture tube if you will has a high vacuum drawn on it. in the front on the picture glass are three color phosphores containing blue, green and red dots. these are arranged in a triangle configuration all over the picture tube. in back of these is a shadow mask consisting of holes that line up with the phosphores. in the tube neck are three electron guns that produce a red color, a blue color, and a green color. outside on the neck are two coils, each 90 degrees apart that direct the beams vertically and horizontally. the horizontal scan sweeps the screen with 525 lines per second, the vertical is your retrace signal that is proportional to your line frequency of 60 cycles per second. there are two circular permanent magnets that further align your color signals so that they approximately hit their respective color dots on the picture tube through the shadow mask. convergence coils there are six of them further align the colors to create a picture. these are connected to their own set of coils.