M1438S monitor problem
Baxter Tocher
Hi folks
I got an Amiga M1438S monitor for Christmas, and I'm having a serious
problem with it.
In certain screenmodes (the higher resolutions), there's a "jitter"
starts to appear after about 20-30 minutes of use. Vertical bands or
stripes flash on and off randomly, like a ghost picture, across the whole
screen. It seems to stop when a menu is pulled down and left there (with
MagicMenu). The problem *doesn't* occur in the standard PAL modes, and is
at its worst in Super72 Hires. It also affects the mouse pointer.
Soemtimes it doesn't affect the frontmost screen as much, but when I pull
this down to show Workbench, it's much worse on that screen while not so
bad on the one that's been pulled down.
I'm using an A1200 with Blizzard-III 50Mhz 030 and Squirrel with CD-ROM
and SyQuest 135 attached. Could it be a power related problem? Or
something to do with the Amiga video chip (which has never used those
screenmodes before, so perhaps has always been this way)? Is it something
heat related, since it doesn't happen in the first 20 minutes or so after
switching on? Could it be a problem when the Blizzard heats up? Is it
the monitor or the Amiga?
I need to know quickly whether the monitor has to be sent back or not...
Baxter
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Didier Levet
Le 28-Déc-96 15:51:32, Baxter Tocher ecrivait a propos de M1438S monitor
problem
Hello,
BT> In certain screenmodes (the higher resolutions), there's a "jitter"
BT> starts to appear after about 20-30 minutes of use. Vertical bands or
BT> stripes flash on and off randomly, like a ghost picture, across the whole
BT> screen. It seems to stop when a menu is pulled down and left there (with
BT> MagicMenu). The problem *doesn't* occur in the standard PAL modes, and is
BT> at its worst in Super72 Hires. It also affects the mouse pointer.
Try to replace the pure white colour (RGB 255/255/255) with a light grey
like RGB:240/240/240. A lot of 1200 have this problem...
BT> I'm using an A1200 with Blizzard-III 50Mhz 030 and Squirrel with CD-ROM
BT> and SyQuest 135 attached. Could it be a power related problem? Or
BT> something to do with the Amiga video chip (which has never used those
BT> screenmodes before, so perhaps has always been this way)? Is it something
BT> heat related, since it doesn't happen in the first 20 minutes or so after
BT> switching on? Could it be a problem when the Blizzard heats up? Is it
BT> the monitor or the Amiga?
It's only your A1200 fault. The chip which is on left hand side, at the
bottom of the mother board, heat a lot. Put your finger on it, and your
magic stripes will disappear :)
IMHO, there is nothing to do because of the keyboard.
BT> I need to know quickly whether the monitor has to be sent back or not...
I've the same problem with my old A1200, but now my monitor works fine
with an A4000.
Regards,
--
Didier LEVET aka "kakace", bug programmer :)
A4040-25/20Mo/HD 540Mo/PicassoII/A4008/MultiFaceCard III/ZIP/CD-ROM 4x
kak...@aix.pacwan.net kakace@AmigaTel kakace #amigafr,#icv
Never use a PC : It's for masochists !
Pierre Boutin
>Hi folks
>I got an Amiga M1438S monitor for Christmas, and I'm having a serious
>problem with it.
>In certain screenmodes (the higher resolutions), there's a "jitter"
>starts to appear after about 20-30 minutes of use. Vertical bands or
>stripes flash on and off randomly, like a ghost picture, across the whole
>screen. It seems to stop when a menu is pulled down and left there (with
>MagicMenu). The problem *doesn't* occur in the standard PAL modes, and is
>at its worst in Super72 Hires. It also affects the mouse pointer.
>Soemtimes it doesn't affect the frontmost screen as much, but when I pull
>this down to show Workbench, it's much worse on that screen while not so
>bad on the one that's been pulled down.
>I'm using an A1200 with Blizzard-III 50Mhz 030 and Squirrel with CD-ROM
>and SyQuest 135 attached. Could it be a power related problem? Or
>something to do with the Amiga video chip (which has never used those
>screenmodes before, so perhaps has always been this way)? Is it something
>heat related, since it doesn't happen in the first 20 minutes or so after
>switching on? Could it be a problem when the Blizzard heats up? Is it
>the monitor or the Amiga?
>I need to know quickly whether the monitor has to be sent back or not...
>Baxter
>--
>---- internet: bax...@trance.ednet.co.uk ------- fidonet: 2:259/66.17 ----
>--------------- irc: McBain ------------------------- Team AMIGA ---------
If you got this problems with standard amiga screenmode,i.e. not Graphic card
I think that your monitor is in trouble.
OnSlaUGhT
Pierre Boutin wrote:
>
> >I got an Amiga M1438S monitor for Christmas, and I'm having a serious
> >problem with it.
> >In certain screenmodes (the higher resolutions), there's a "jitter"
> >starts to appear after about 20-30 minutes of use. Vertical bands or
> >stripes flash on and off randomly, like a ghost picture, across the whole
> >screen. It seems to stop when a menu is pulled down and left there (with
> >MagicMenu). The problem *doesn't* occur in the standard PAL modes, and is
> >at its worst in Super72 Hires. It also affects the mouse pointer.
>
> >I need to know quickly whether the monitor has to be sent back or not...
>
> >Baxter
> If you got this problems with standard amiga screenmode,i.e. not Graphic card
>
> I think that your monitor is in trouble.
I myself get lighter parts on the screen (bars) when opening a screen.
I use a PicassoII in 38Khz on this monitor with Cybergfx installed, and
when i use a light grey background and open a dark or white box on that
screen, on both sides of the box blueish stripes apear, this is not
occuring on the 1960 monitor. So i think it's deffenitly the monitor
screwing up....
OnSLAUGHt
Sjoerd De Vries
In a message of 28 Dec 96 Baxter Tocher wrote to All:
BT> From: Baxter Tocher <bax...@trance.ednet.co.uk>
BT> Hi folks
BT> I got an Amiga M1438S monitor for Christmas, and I'm having a serious
BT> problem with it.
BT> In certain screenmodes (the higher resolutions), there's a "jitter"
BT> starts to appear after about 20-30 minutes of use. Vertical bands or
BT> stripes flash on and off randomly, like a ghost picture, across the
BT> whole screen. It seems to stop when a menu is pulled down and left there
BT> (with MagicMenu). The problem *doesn't* occur in the standard PAL modes,
BT> and is at its worst in Super72 Hires. It also affects the mouse pointer.
BT> Soemtimes it doesn't affect the frontmost screen as much, but when I
BT> pull this down to show Workbench, it's much worse on that screen while
BT> not so bad on the one that's been pulled down.
BT> I'm using an A1200 with Blizzard-III 50Mhz 030 and Squirrel with CD-ROM
BT> and SyQuest 135 attached. Could it be a power related problem? Or
BT> something to do with the Amiga video chip (which has never used those
BT> screenmodes before, so perhaps has always been this way)? Is it
BT> something heat related, since it doesn't happen in the first 20 minutes
BT> or so after switching on? Could it be a problem when the Blizzard heats
BT> up? Is it the monitor or the Amiga?
BT> I need to know quickly whether the monitor has to be sent back or
BT> not...
BT> Baxter
I am sorry that I did write you not quicker.
This is a problem in the chips of your Amiga. I did have the same with my
second A1200. The first was working perfectly (a C=1200) after that A1200
was dying I bought a AT A1200 and I had those stripes you discribed.
I did show it to my dealer and he gave me na new AT A1200 and directly
the screen was okay.
I had the same problem in al PAL modes (PAL and interlace PAL) the screen
was okay and al other special modes it was wrong (DBPAL DBNTSC Super72
Multiscan ect.) I had at that time also a blizzard 1230 III 8 MB and
also it was starting after a while the machine was switch on.
An the same things with pulling a screen down.
I am sure that this is a defective Amiga. (Alice)
Bye,
Sjoerd
A4000 Warp 4040 66 MB 2.1 GB Merlin GFX A1200/060 34 MB 1 GB
-- Via Xenolink 1.985B5, XenolinkUUCP 1.1
Baxter Tocher
In article <sjoer...@grafix.xs4all.nl>, Sjoerd De Vries wrote:
BT>> I got an Amiga M1438S monitor for Christmas, and I'm having a serious
BT>> problem with it.
BT>> In certain screenmodes (the higher resolutions), there's a "jitter"
BT>> starts to appear after about 20-30 minutes of use. Vertical bands or
BT>> stripes flash on and off randomly, like a ghost picture, across the
> I am sorry that I did write you not quicker.
That's OK :) I did some testing with a friend's gear and established that
the problem is with my A1200 rather than the M1438S.
> This is a problem in the chips of your Amiga. I did have the same with my
Yep, someone has confirmed this in another newsgroup.
> I am sure that this is a defective Amiga. (Alice)
The other reply suggested that Lisa's the problem. Either way, it
definitely appears that a faulty chip is causing the problem. I've come
across someone else who is experiencing the same thing.
As a workaround, I'm running a commodity called ColorPatch and I've set
this to drop the contast by 1%. This is enough to make the problem go
away.
Thanks for your help.
Baxter
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--------------- irc: McBain ------------------------- Team AMIGA ---------
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