Radius Intellicolor Display/20e Microcontroller Problem?

[Jeff Walther]

My Radius IntelliColor Display/20e starts up green, but with a strong
green that suggests having the brightness turned up way too high. The
green is like a
overall very strong wash, pretty much unusable since it's so intense.
During these periods, the focus is also out. After a period of time it
reverts to normal and is a lovely sharp monitor. That period of time
seems to be lengthening.

Sometimes, after a while, the green seems to go away, but the over-wash
and poor focus remains. Then still later the image goes back to good.

At a guess, the microcontroller that handles the settings is having some
difficulty and the monitor is starting up with some settings in their
unbiased state. Perhaps its (the microcontroller's) 5v (?) supply has
gone wonky--possibly expiring electrolytic caps? Or maybe the memory
element that stores the settings (Flash, EEPROM?) has reached the end of
its life with too many cycles?

Anyway, I'm handy with soldering tools from axial caps all the way down to
208 pin quad flat packs. What I'm not any good at is diagnostics.

I think that this monitor has an equivalent Sony model, but I'm not
certain. It's definitely a trinitron. I can just make out the two
horizontal lines at 1/3 intervals.

I hope that someone is familiar with this problem and can point me at the
likely culprit in terms of component(s) that need replacing.

Thank you for any helpful or humorous suggestions,

Jeff

 

[Isaac Wingfield]

My Radius IntelliColor Display/20e starts up green, but with a strong
green that suggests having the brightness turned up way too high. The
green is like a
overall very strong wash, pretty much unusable since it's so intense.
During these periods, the focus is also out. After a period of time it
reverts to normal and is a lovely sharp monitor. That period of time
seems to be lengthening.

Sometimes, after a while, the green seems to go away, but the over-wash
and poor focus remains. Then still later the image goes back to good.

At a guess, the microcontroller that handles the settings is having some
difficulty and the monitor is starting up with some settings in their
unbiased state. Perhaps its (the microcontroller's) 5v (?) supply has
gone wonky--possibly expiring electrolytic caps? Or maybe the memory
element that stores the settings (Flash, EEPROM?) has reached the end of
its life with too many cycles?

My guess is none of the above, but just a thermally intermittent
component in the HV section. Maybe just a noisy focus pot. When the
focus goes out, the convergence fails too, and that can give the screen
an overall color cast. But the real clue is the bad focus. That's a HV
problem for sure.

On the side of the flyback (the box with a large wire that plugs into
the bell of the CRT) will be a couple of adjustment shafts, with
screwdriver slots. One is focus, the other may be a secondary focus or
something else. They will probably have som kind of "sealer" to prevent
rotation.

Find the one maarked "focus" and run it back and forth a few times (to
clear up any intermittents), and then adjust it for best focus over the
whole screen. If the other shaft is marked focus, then diddle both for
best result -- they will interact, but will mainly influence different
portions of the screen -- middle and corners, say.

Isaac

 

[Nort]

My Radius IntelliColor Display/20e starts up green, but with a
strong
green that suggests having the brightness turned up way too
high. The
green is like a
overall very strong wash, pretty much unusable since it's so
intense.
During these periods, the focus is also out. After a period
of time it
reverts to normal and is a lovely sharp monitor. That period
of time
seems to be lengthening.

Sometimes, after a while, the green seems to go away, but the
over-wash
and poor focus remains. Then still later the image goes back
to good.

At a guess, the microcontroller that handles the settings is
having some
difficulty and the monitor is starting up with some settings
in their
unbiased state. Perhaps its (the microcontroller's) 5v (?)
supply has
gone wonky--possibly expiring electrolytic caps? Or maybe
the memory
element that stores the settings (Flash, EEPROM?) has reached
the end of
its life with too many cycles?

Anyway, I'm handy with soldering tools from axial caps all the
way down to
208 pin quad flat packs. What I'm not any good at is
diagnostics.

I think that this monitor has an equivalent Sony model, but
I'm not
certain. It's definitely a trinitron. I can just make out
the two
horizontal lines at 1/3 intervals.

I hope that someone is familiar with this problem and can
point me at the
likely culprit in terms of component(s) that need replacing.

Thank you for any helpful or humorous suggestions,

Jeff

I too have a Radius IntelliColor Display/20e monitor with the exact
same problem that you are/were experiencing. I read the suggested
resolution that Issac Wingfiled offered to you, but I haven’t tried it
yet. I was wondering if you had any luck yet?

Thanks!

 

[iconed]

My Radius IntelliColor Display/20e starts up green, but with a
strong
green that suggests having the brightness turned up way too
high. The
green is like a
overall very strong wash, pretty much unusable since it's so
intense.
During these periods, the focus is also out. After a period
of time it
reverts to normal and is a lovely sharp monitor. That period
of time
seems to be lengthening.

Sometimes, after a while, the green seems to go away, but the
over-wash
and poor focus remains. Then still later the image goes back
to good.

At a guess, the microcontroller that handles the settings is
having some
difficulty and the monitor is starting up with some settings
in their
unbiased state. Perhaps its (the microcontroller's) 5v (?)
supply has
gone wonky--possibly expiring electrolytic caps? Or maybe
the memory
element that stores the settings (Flash, EEPROM?) has reached
the end of
its life with too many cycles?

Anyway, I'm handy with soldering tools from axial caps all the
way down to
208 pin quad flat packs. What I'm not any good at is
diagnostics.

I think that this monitor has an equivalent Sony model, but
I'm not
certain. It's definitely a trinitron. I can just make out
the two
horizontal lines at 1/3 intervals.

I hope that someone is familiar with this problem and can
point me at the
likely culprit in terms of component(s) that need replacing.

Thank you for any helpful or humorous suggestions,

Jeff

Dear friends!

I have the same problem exactly! I tryed Isaak’s advise -
unfortunatelly it doesn’t work in my case. Did you anybody find some
work-around?

I would very grateful for any suggestions (exsept - "buy a new one"



Ilya Colley, Moscow, Russia