[iyonix-support] Intermittent CRT line collapse

       ----------------
Equipment:
Early Iyoniix RO 5.13 with supplied graphics card, Iiyama 22" CRT 
monitor, both 6 years old. 2048 x 1536 x 16M colour mode. It has 
worked perfectly for 6 years, until a month ago..
        ---------------

I'm having an intermittent problem possibly with my CRT computer 
monitor, and if I describe the symptoms I hope someone might be able 
to throw a bit of light on what might be going wrong.

After a lot of white flashes on the screen, which usually occur 
horizontally, the raster sometimes collapses to a single (very bright) 
vertical line mid-way across the screen (ie: in the centre).

At first thought I suspected a dicky contact on the horizontal 
deflection circuitry, but I think I can rule that out because 
sometimes the raster does not collapse, but there is still a bright 
(but not as bright) vertical line down the centre of the screen. If 
the horizontal deflection voltage had collapsed, I would not get a 
normal raster at the same time as the bright centrally placed vertical 
line.

This comes and goes willy nilly. Most of the time the raster is 
normal. About 1% of the time it has a seizure with one or other of the 
above described symptoms. After a few seconds it usually recovers all 
by itself without any intervention. There is no discernible pattern in 
its seizures.

I have un-plugged and re-inserted both ends of the video cable to 
clean the contacts.

Anyone any idea what may be going on?

[I'm not at all keen on opening up the monitor. I was a low voltage 
electronic engineer, and shy away from lethal voltages].

Bashing the monitor gently does not invoke any nasties, so it is hard 
to think it may be a dicky contact in the monitor. I haven't bashed 
the computer because it has a hard drive in it.

Could it be the graphics card?

-- 

Cheers
Roger

Atomic Software   http://rogerdarlington.members.beeb.net/
Summer Winers     http://rogerarm.freeuk.com/rogerarm/
Wild Flowers      http://rdarlington.members.beeb.net/
Flower Heads      http://fheads.members.beeb.net/
Too lazy to turn over your CD?: Get a CD-re-winder.

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