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View Full Version : Blurry Monitor - adjusting it procedure.



Feelers
23-06-2006, 08:40 PM
Hey guys,

I bought a 19 inch monitor of trademe for $30, the brightness is a little off (apparently there is some buildup of Phospherous or something which can possibly be fixed) but it looks pretty good. A bit of an upgrade for the 14 :D

Anyways, there's a blurry area in the middle, I hear this is easy to fix, take the top off and turn a knob or something, also that this is very dangerous because you cant touch anything. I'll be careful.

The screen is an IBM G96 19'' monitor, are there any online pictorials? Is this pretty much it? Anything I should know about, or could there be some other cause for the blurr?

Cheers

gibler
23-06-2006, 09:27 PM
Hmmm, some info (http://www.repairfaq.org/REPAIR/F_crtfaq.html).
You really need to get hold of the service manual though...

Feelers
23-06-2006, 10:22 PM
I just noticed there are also very slight faint lines bending around the centre of the screen, I'll draw a pic....

http://www.shroomery.org/forums/files/06-25/105436701-untitled.jpg][image]http://www.shroomery.org/forums/files/06-25/105436701-thumb_untitled.jpg

Anyone know whats wrong?

FoxyMX
23-06-2006, 10:24 PM
You might like to check out the FAQF1 Wiki for the monitor FAQs that might be of some help. They are under the Hardware section on this page (http://faqf1.net.nz/index.php?title=List).

pctek
23-06-2006, 11:30 PM
I just noticed there are also very slight faint lines bending around the centre of the screen, I'll draw a pic....

http://www.shroomery.org/forums/files/06-25/105436701-untitled.jpg][image]http://www.shroomery.org/forums/files/06-25/105436701-thumb_untitled.jpg

Anyone know whats wrong?
Its on its way to the grave...

Feelers
24-06-2006, 12:30 AM
How long she got left in her you rekon? :D

The lines are pretty faint, they only show up on grey backgrounds really. The blurryness has subsided a bit - I think the monitor hadnt been used in a while.

george12
24-06-2006, 02:32 AM
Try degaussing it. It'll be an option in the menu. This sometimes helps screens that have partial blurriness or strange artifacts.

Failing that, if you're lucky there might be a focus adjustment pinhole in the back of the monitor. It should be well-labelled, don't go twiddling a screw if you don't know what it will do. You should use a plastic screwdriver and practise getting it into the screw with the monitor off. Note that the monitor being off does not mean safety. However with an insulated screwdriver you should be OK.

If you feel up to it, have someone else watch the monitor while you turn this screw, so you can get it right quite easily. If you don't like the idea of poking things into your screen while it's on, you can do it with the screen off fine, it will just take a lot longer, as you will have to test it every time you adjust it. The dial is VERY sensitive, so it may be a good idea to remember which way it pointed if you seem to screw it up, or even worse, if it's not actually the focus adjustment.

Feelers
24-06-2006, 10:19 PM
Sweet :D

I busted the back off, and mucked around with the screw, it was kinda scary :lol: , this monitor had a realy huge shield thing that made it look rather daunting.

But now its going well, anyone who is interested here's the link for the method, pretty simple, the knob is labelled too - realy annoying that this isnt accessible from outside the housing, which would have been easy to do. http://faqf1.net.nz/index.php?title=Adjusting_the_focus_on_a_monitor

Cheers for you help.

SurferJoe46
25-06-2006, 07:21 AM
(11 post attempts to get this to go...what's going on there?)

Is the "Billy" who made this post the same "Billy" here on F1?

I suggest that this part:

"Billy's Safety Note: Put your free hand in your pocket while making these adjustments so that you don't accidentally touch live metal."

...........be placed very near the top of the line that reads:

"7) Switch on again and display the test screen I mentioned earlier. Allow the monitor to warm up for 15-20 minutes then carefully and slowly adjust the focus a little each side of the existing setting. (Should the shaft not want to turn, it may be secured in position by glue or paint. Gripping the shaft with long-nose pliers and gently exerting rotating force will usually crack the seal and Bob's your Uncle!)"


:blush: Better late than never is not a good idea for this warning note.

FoxyMX
25-06-2006, 12:28 PM
Is the "Billy" who made this post the same "Billy" here on F1?
Yup, sure was. :cool:

Thanks for pointing that out, Joe. I'll see what Billy thinks about your suggestion and get the FAQ updated if necessary. :thumbs:

Billy T
25-06-2006, 01:43 PM
I just noticed there are also very slight faint lines bending around the centre of the screen, I'll draw a pic....

Anyone know whats wrong?
That is called moire effect and is an artefact that commonly appears when focus is off or the CRT is failing.

Read the FAQ linked in this thread, run the monitor for about 24 hours to allow any gas accumulation to be absorbed internally (there are parts called "getters" inside the tube that soak up gas molecules) then follow the procedure outlined in full. Be careful not to touch any metalwork as it is all live, and keep one hand in your pocket while adjusting.

Backing off the contrast can also help, but if following the FAQ doesn't fix it and produce a good sharp image then it is probably stuffed.

Cheers

Billy 8-{)