[TechAssist] Re: Sony 20" monitor Intermittent poor Focus
- From: Frank Luu <fkluu@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 11 Dec 2002 06:16:14 -0800 (PST)
Hi there:
I did have a unit like this and had same problem. I
order the dual focus assembly and replace it. Look Ok
for 1 week then out of focus again. I,finally gave the
customer his money back.
If you don't have DAS to reset the micro,just don't
spend more time on it.
Frank Luu
--- peggs <peggs@xxxxxxxxxxxxxx> wrote:
>
> The 2 leads going to the CRT Socket are H and V
> Focus,I
> ass-ume.I think this is called Dual Focus,but I
> could be wrong.
> Anyway,does your monitor look fine when you turn it
> off
> and right back on(after the poor focus has appeared
> of course) ???
>
> Peggs
>
> At 08:47 PM 12/10/02 EST, Mykeelike@xxxxxxx wrote:
> >In a message dated 12/10/02 2:04:36 PM Pacific
> Standard Time,
> >peggs@xxxxxxxxxxxxxx writes:
> >
> >>
> >> model GDM-F500
> >> chassis SCC-L03C-A
> >> Nov. 1998
> >> 'Flat Tube' #M50LPU15X
> >> This thing has Focus that will Drift very
> Intermittently.
> >> It may play for days without drifting.
> >> It has a seperate Focus 'Divider',which looks
> like
> >> just a small version of a Flyback. It has one
> Lead in
> >> from the Flyback,and 2 leads out to the Pix Tube
> Socket.
> >> The input has 10Kv and each output has app.
> 5Kv,both
> >> when the Focus is good and when it's bad.
> >> Some of the Plugs on the CRT PCB are marked with
> voltages,all
> >> of which appear to be fine.
> >> Are these Tubes known to go bad with poor focus
> ???
> >> I'm going to pull the CRT Socket to have a look
> at it
> >>
> >> Peggs
> >> Peggs' Electronics
> >> 1519 West 2nd Street
> >> Owensboro,KY 42301
> >> 270-926-4968
> >> fax 270-686-7399
> >>
> >
> >i have the same model Sony in my shop with the
> exact same problem.the
> monitor
> >came in dead . i changed the CXA2043. monitor looks
> good but has this focus
> >problem. i have determined that the focus voltage
> does not change but there
> >are two sets of focus voltages at which the tube
> focuses at. i know this
> >monitor has a dynamic focus that is probably
> accessible in das however when
> >i look at the waveform and voltages into the focus
> block they do not seem to
> >change when the tube decides to switch int its
> secondary focus mode. this
> >problem is not caused by the cxa IC. i am
> suspecting the CRT. i believe Sony
> >has the answer but i have not been able to get
> through to them. if you find
> >out what this is please let me know.
> >
> >Mike Wilson
> >a.m. stereo & video
> >Seattle WA
> >206 364 5904
> >
> >
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> >
> Peggs' Electronics
> 1519 West 2nd Street
> Owensboro,KY 42301
> 270-926-4968
> fax 270-686-7399
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