Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old October 19th 03, 11:49 PM
 
Posts: n/a
Default Problem with retrace lines on EIZO F55S...

Here's the problem, and what I have seen about it...

Before all, I must say that I did a lot of research on this problem in Sam's
Repair FAQ, and found that the problem is something with retrace lines...
But I don't know what, so I'll ask here...

OK, problem is like this... My monitor was very often online for a few days
(more like week, two or so)... And, since I wasn't at home for a weekend, I
turned it off... And, today, I turned it back on, and here ya go - I see
some lines dancing on the black background...

So far I've seen about these lines - if I lower the brightness to 0, lines
are very visible... And, if I raise brightness to 100, I almost can't see
the lines... I tried whacking the monitor, but no use...

I opened it, used a hair-dryer (hot air) and a rubber stick (bumping
capacitors and other components) trying to locate cold solder joints, but, I
couldn't find any...

So, browsing through www.repairfaq.org, I've found that these could be the
problems (copy paste):


---------------------
Screen (G2) or master brightness/background/bias control - mark setting and
then see if a slight adjustment removes the retrace lines. See the chapter:
"Monitor Adjustments". Of course, if this happened suddenly, the problem is
not due to a misadjusted control though a dirty pot is possible - turn it
back and forth - this might clean it and restore normal operation.

Power supply or connection to CRT neck board - insufficient voltage will
result in the CRT never totally blanking. Check (usually scan derived) power
supply components (from flyback).

General power supply - check B+ for correct value and ripple. A main power
supply fault might result in these symptoms (and usually many others).

Blanking circuit - this may be a part of the video/chroma chip or separate.
Check waveforms to determine if the blanking pulses are making it to the
video output.
---------------------

I didn't try nothing around G2 pot, but I must ask following question... Is
it possible that simply the problem is in this pot, and if I turn it a bit
and return it to it's original position, the problem could be gone? I mean -
I suspect at the worn pot... ?

Power supply - I don't know... I could try with screen breathe tests...
Nothing - the frame is rock-solid... I guess the power supply is not the
problem... Something in horizontal deflection should be the problem, I
guess, because I can see diagonal lines (shaped this way '/')... And some
bacground blinking is visible...

And, yes, sometimes the screen simply goes to some kind of blueish black
background, and blinking is still visible... I don't know how to describe
it... It goes blueish just for a moment, and then goes back to black
background...



Any help to this monitor? I am planning to let the guys from repair-shop
take a look at it... But, I'd just like to know what is happening to ti... I
like this monitor very much, and I don't know if I will find anything
similar if this one dies... (((

Thanks to all good people...



--
"Brezuljkasts li gledalisteu njuku ?" upita kokakolaa pipa skakavacu
komponiru. "Nisam ja nikog bombardiro !" rece Klinton ljubi "Ja samo
snajperisto kolje zagadjenm !" By runf

Damir Lukic,
a member of hr.comp.hardver FAQ-team

  #2   Report Post  
Old October 19th 03, 11:53 PM
Arthur Jernberg
 
Posts: n/a
Default Problem with retrace lines on EIZO F55S...

Could be just and djustment or if the unit is a couple of years old, failed
compoinents inthe g2 or bias supply ckts. Good idea to ahve the repair shop
have a go.
wrote in message
...
Here's the problem, and what I have seen about it...

Before all, I must say that I did a lot of research on this problem in

Sam's
Repair FAQ, and found that the problem is something with retrace lines...
But I don't know what, so I'll ask here...

OK, problem is like this... My monitor was very often online for a few

days
(more like week, two or so)... And, since I wasn't at home for a weekend,

I
turned it off... And, today, I turned it back on, and here ya go - I see
some lines dancing on the black background...

So far I've seen about these lines - if I lower the brightness to 0, lines
are very visible... And, if I raise brightness to 100, I almost can't see
the lines... I tried whacking the monitor, but no use...

I opened it, used a hair-dryer (hot air) and a rubber stick (bumping
capacitors and other components) trying to locate cold solder joints, but,

I
couldn't find any...

So, browsing through www.repairfaq.org, I've found that these could be the
problems (copy paste):


---------------------
Screen (G2) or master brightness/background/bias control - mark setting

and
then see if a slight adjustment removes the retrace lines. See the

chapter:
"Monitor Adjustments". Of course, if this happened suddenly, the problem

is
not due to a misadjusted control though a dirty pot is possible - turn it
back and forth - this might clean it and restore normal operation.

Power supply or connection to CRT neck board - insufficient voltage will
result in the CRT never totally blanking. Check (usually scan derived)

power
supply components (from flyback).

General power supply - check B+ for correct value and ripple. A main power
supply fault might result in these symptoms (and usually many others).

Blanking circuit - this may be a part of the video/chroma chip or

separate.
Check waveforms to determine if the blanking pulses are making it to the
video output.
---------------------

I didn't try nothing around G2 pot, but I must ask following question...

Is
it possible that simply the problem is in this pot, and if I turn it a bit
and return it to it's original position, the problem could be gone? I

mean -
I suspect at the worn pot... ?

Power supply - I don't know... I could try with screen breathe tests...
Nothing - the frame is rock-solid... I guess the power supply is not the
problem... Something in horizontal deflection should be the problem, I
guess, because I can see diagonal lines (shaped this way '/')... And some
bacground blinking is visible...

And, yes, sometimes the screen simply goes to some kind of blueish black
background, and blinking is still visible... I don't know how to describe
it... It goes blueish just for a moment, and then goes back to black
background...



Any help to this monitor? I am planning to let the guys from repair-shop
take a look at it... But, I'd just like to know what is happening to ti...

I
like this monitor very much, and I don't know if I will find anything
similar if this one dies... (((

Thanks to all good people...



--
"Brezuljkasts li gledalisteu njuku ?" upita kokakolaa pipa skakavacu
komponiru. "Nisam ja nikog bombardiro !" rece Klinton ljubi "Ja samo
snajperisto kolje zagadjenm !" By runf

Damir Lukic,
a member of hr.comp.hardver FAQ-team



  #3   Report Post  
Old October 20th 03, 01:29 AM
James Sweet
 
Posts: n/a
Default Problem with retrace lines on EIZO F55S...


"Arthur Jernberg" wrote in message
...
Could be just and djustment or if the unit is a couple of years old,

failed
compoinents inthe g2 or bias supply ckts. Good idea to ahve the repair

shop
have a go.



Now you know better than that, it's not just an adjustment if it occurred
suddenly. Something has failed, unfortunatly without looking at it it's
pretty hard to say what. Shouldn't cost a whole lot to have it fixed though.




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