Monitor - colors level

Did you swap the driver board or CRT?

If so, the "simple" fix is to use the same electronics that was originally with the working CRT.

If there was no physical damage to the circuit board, you should be able to just swap the driver transistors. (soldering will be required)

If not, look for potentiometers near the driver transistors. Hard to say if you need to turn down the green, or raise the level of the red and blue guns.

If there is a setup mode, I suspect that you enter it by pressing 1 or more switches as you apply power to the monitor. It may also work by holding switch combinations down for several seconds.

Chas

Hi what the Chas said was nearly correct. The problem is that CRT cathode voltages to get the correct colour can vary by about 20% from cathode to cathode. This results in the wrong background colour when switching CRT's even with the same type number and even batch number. Just changing the transistors will not help even changing the CRT base board "the one mounted on the back of the CRT" may improve or make matters worse, if the values sent to the video amplifiers are sent from the main boardabout 90% of the time. Email me at my alias and I will find out for you if there is a key sequence for the setup mode.

Rich

I tried different switches combination but I obtain only normal OSD setup (size, position, etc.).
Maybe exist a special software for this issue?

Also don't exist any pontentiometers.

I have 4 switches on monitor panel:
- 1 for enter/exit in OSD/menu
- second (left arrow) for search and increment/decrement value
- third (right arrow) for search and increment/decrement value
- 2 for select an option from menu

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