[wellylug] Faulty Monitor

[Jethro Carr]

On Mon, 2004-08-23 at 21:37, Tony Wills wrote:
> If it's under warranty why are you bothering us then? ;-)
> 
try and determine the problem. Ascent's techs haven't been very usefull
problem solvers in the past.... (for me anyway)


> The noise is most likely from something vibrating at the refresh frequency 
> (or some harmonic there of), most likely the flyback transformer.  You may 
> find that at different refresh rates and resolutions you get a different 
> noise.  I don't know why different colours would effect this (maybe the 
> higher screen current with brighter displays marginally effects the refresh 
> circuitry, but then you'd probably notice the display width change).
> 
> Turning it off most likely simply lets it cool off, maybe there's a bad 
> solder joint the opens up when hot.  Capacitors don't make much sound 
> (apart from bang!).  Is it a high pitched pure note or more of a wheezing 
> sound?

A high pitched pure note.



> If it wasn't under warranty and you wanted to fix it yourself, you'd want 
> to check out the mounts of the flyback transformer and surrounding metal 
> screen etc to ensure none of it can vibrate (of course first unplugging it, 
> checking the tube is discharged and being qualified to do it, might help).
> Bumping the monitor (percussive maintenance) may have some effect, as might 
> titling it sideways, flexing the case etc.

Tried 'percussive maintainance'. It's a favorite of mine. However, this
time it didn't work. :-(

I wouldn't try fixing it myself. Don't moniters store power in their
circuit, like power supplies?


> Whether you'll get it replaced under warranty is a different matter - they 
> might just tell you they all do that :-) 

Better not... I won't be impressed.


-- 
-- Jethro

dodocaptain at paradise.net.nz

http://homepages.paradise.net.nz/jethroc
http://homepages.paradise.net.nz/jethroc/cv.html

http://www.wellylug.org.nz