No brightness control on a ez20 sanyo

oregonarcade

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I have done a complete cap kit and set the B voltage. I cant get any brightness contol out of the main pot or the sub brightness pot. I can contol the brightness on the flyback but thats it. I have replaced both pots, check solder joints, wires and still no adjustment at all. Picture looks ok but i cant get any white to come out unless I crack up the fly till lines show. Any ideas?
 
I have done a complete cap kit and set the B voltage. I cant get any brightness contol out of the main pot or the sub brightness pot. I can contol the brightness on the flyback but thats it. I have replaced both pots, check solder joints, wires and still no adjustment at all. Picture looks ok but i cant get any white to come out unless I crack up the fly till lines show. Any ideas?

What are the odds! I have the EXACT same symptoms in my 20EZ.
 
You have 3 brightness controls, and they all work together.
Center the brightness pot on the front corner of the chassis.
Center the sub-brightness pot in the middle of the chassis.
Adjust the Master brightness on the fly making sure that your B+ doesn't change. (108vdc)

Once you have done this, then adjust the brightness pot on the front corner of the chassis as needed.
 
There is no adjustment at all in the sub pot or main pot. The only thing that will change the brightness is the fly, none of the other pots are working
 
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