wg u2000 problem

[big boss]

hi,

i thing i have wg U2000 . 25x3299-00. My problem is, that the color red is very weak.
tube is  A63AGD01X



that is red




green



blue




contrast is on the end,if i move it 1 mm, the screen is like near black/white






this is windows with the bleeding



i am a newbie in this.

i dont know if the tube is bad or something with neckboard ....

witch points are here the green,blue and red. i want test it, if my tube are ok?





i hope you can help me.
sorry for my bad english

[grantspain]

colour drive transistors on the neck card are notorious for failure otherwise its a weak gun

[big boss]

hey,

thank your for the answer. can you say me, what is a "gun"  . i am  not so perfect in english 

best regards

[grantspain]

hey,

thank your for the answer. can you say me, what is a "gun"  . i am  not so perfect in english 

best regards

it means one of the colour guns in the tube is weak-very common on problem on old crt

[big boss]

thank you, the gun is on the tube? if it weak, can i change it or i need a new tube?

i see, on this arcaderepairtips that checking the tube on the neckboard. Wich points is for the collors RGB?

http://www.arcaderepairtips.com/2011/03/23/checking-a-monitor-tube/

best regards

[grantspain]

you are french speaking?
there are french forums that can help you with this

[lilshawn]

i will guess german since the site the photos where uploaded to is.

if i'm correct:

the "guns" are inside the picture tube. they can't be replaced, but sometimes you can adjust to color to make it stronger.

by your picture, it looks like the red color gun needs to be turned stronger. the others look okay.

it also appears that the brightness needs to be turned lower, that is why it bleeds like that.



google translated quote:

die "Waffen" sind im Inneren der Bildröhre. sie können nicht ersetzt werden, aber manchmal kann man die Farbe einstellen, damit es stärker.

von Ihrem Bild, es sieht aus wie die rote Farbe gun muss sich stärker werden. die anderen sehen okay.

Es scheint auch, dass die "brightness" (Helligkeit), um sich niedrigere werden muss, deshalb ist es so blutet.

[big boss]

hey, thank you. yes, i am from germany and i live in the near of france(strasbourg is neighbor city), but i cant good speak french.  

i think i have a contrast problem too.
 If I turn the contrast anything complete, the color goes away  than less full blast and its like black and white . With contrast
on max, there is faded color. yes, the bleeds cames from the full contrast.
how can i make the red color gun stronger?

for my question before, witch points is for the rgb colors on the neck board. i want test the tube, if it ok

best regards
big boss

[lilshawn]

to test the tube you need a special test machine not many people have.

the circuit board on the tube has adjustment for colors. much like the contrast and brightness. they have a part you can grasp with your finger to turn.

when looking at the back of the tube the same as this photo....


the first adjustment on the left is "red"  it is printed on the board as "r-drv".

try to turn clockwise the adjustment to make the output of the gun stronger. not too much or all the screen turn red. turn lower (anti-clockwise) if screen turns too red.

[big boss]

thank your, for your answer. 

yes i have do it too. but i havent good results.
I want test my tube like  http://www.arcaderepairtips.com/2011/03/23/checking-a-monitor-tube/  , but i dont know ,which points on the neckboard is Red, blue and green.
if the tube is not ok, i have a big problem.     if that tube is ok, i want to make cap kit.   


best regards
big boss

[lilshawn]

i have marked the red green and blue... also any black is "ground" as well as the metal frame of the monitor.

be warned the gray colored point is high voltage and should not be touched. i show because it is close to the red and green color points.

[big boss]

thank you, that is what i need, your the best 

i think my tube is ok   
you can see on the photos

Blue


green


red


that is not easy, to make o photo with one hand 

i need a cap kit. have you a list, what i need on pieces?


best regards
big boss

[lilshawn]

wells gardner makes a "cap kit" with all the capacitors you need... it's part number is "S-KIT CAP-U50"

it is available here: http://www.wellsgardner.com/products/details.asp?iCat=4&iSubCat=45

it's cost is 35 us dollars and it may be expensive to ship to your country. you  may find it cheaper to buy the capacitors yourself locally. all the caps you need to replace are included.

it's not hard to put them together yourself, all the larger cylinder shaped "electrolytic" capacitors need to be replaced. just write them all down and make up a list. i don't usually worry about the small ones. you should replace the 6 capacitors on the neck board for sure.

another option is to use the list from mouser... this is the "k7400/k7500" kit they are the same as the "u2000/u5000" monitors (CREDITS to smalltownguy for putting the mouser list together here)

http://www.mouser.com:80/ProjectManager/ProjectDetail.aspx?AccessID=66CFEEEB31

not sure how much shipping to your country would be, but it might be bad too.

the project list has the number of each kind you need... so feel free to copy.

NOTE: some of the caps in the list have been upgraded in voltage. (35 volts instead of 25 volts) this is okay.

[big boss]

hey, thank your for all. 


best regards
big boss