Amiga 1080 Monitor

[spaceman88]

I was replacing some capacitors on my Amiga 1080 monitor and when I finished I noticed that picture color was all off.  I tried adjusting the colors based on information from the service manual, but can't see to get it to produce a white image.  I've attached my test image and the image that gets produced on the monitor when using the composite input.  Anyone have any suggestions?  Is is just a matter if getting the colors tuned correctly or could there be something else wrong?

Did you adjust the grey scale? Turn the colour control all the way down (B/W), turn the brightness down to a modest level and adjust the red, green and blue controls (on the CRT board or on the back of the main board) until you have a screen with no colour tint, true B/W image. Then try turning the colour back on.

[spaceman88]

Can I just use the RGB color bar image I have been using for this adjustment?  Like the one I attached to the post?

Yes you can, but looking at your picture again, your white bar is completely black. That's not a grey scale adjustment. Not sure I've seen this before.

[spaceman88]

It's strange.  You think if you can see each individual color then showing white would be easy since it's just the sum of the parts.  I'll double check all my work again.  Maybe I missed something.  The  monitor was fine until I changed the capacitors.  I still have the old ones.  Maybe I'll switch them back.

If you replaced with the proper ones you shouldn't have to change back. Check to make sure you didn't hit a service switch somewhere, I'm not sure what this monitor has, but some have switches to kill vertical sweep, kill colour (for the grey scale I mentioned) etc., seems a long shot but...... Also as someone mentioned, poor solder joints around the CRT board and on the wires that run from the main board up to the CRT board.

[spaceman88]

Excellent work! I would not dare go near the inside of a CRT.

The dangers of CRT's have been greatly exaggerated over the years. A microwave oven is far more dangerous, I met a guy who lost 2 or 3 fingers because he did the test for high voltage incorrectly (to say the least).

[spaceman88]

I wouldn't go inside a microwave over either! :roflmao:

Well, better safe than sorry :-).

[spaceman88]

Some microwaves have toxic berylium in the magnetron, so they say.

Yeah, when I worked at the shop, we were warned not to break the ceramic pieces inside the magnetron if we tried to retrieve the (very strong) magnets. Very bad for the lungs, causes a condition I can't remember the name of, but similar to COPD.