[TechAssist] Re: Sony 20" monitor Intermittent poor Focus
- From: Mykeelike@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 11 Dec 2002 21:24:01 EST
In a message dated 12/11/02 8:30:51 AM Pacific Standard Time, jr@xxxxxxxxxxx
writes:
>
> I had the same model monitor about 2 months ago with the same exact
> problem.
> The focus would jump out intermittently.
> I changed the focus block. No help.
> The vert &horz pulses do not change when the focus goes out.
> The focus voltages do not change at the crt.
> If I would unplug the crt board (while the monitor was on) and plug it back
> in, the focus would also change.
> I concluded it was the crt, since the voltages or the pulses were rock
> steady.
> I do have the service manual in pdf form, if you want it. I can try and
> email it to you. It is about 7 meg in size.
>
> Jose' Reyes
> @ Kwik Fix TV
> 619 Pondella Rd.
> N. Ft. Myers, Fl. 33903
> E-Mail: jr@xxxxxxxxxxx
>
> ----- Original Message -----
> From: "peggs" <peggs@xxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, December 10, 2002 4:48 PM
> Subject: [TechAssist] Sony 20" monitor Intermittent poor Focus
>
>
> >
> >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
> >------------------------------------------
>
Jose', I think the pdf would be useful.
mike wilson
a.m. stereo & video
seattle wa
mykeelike@xxxxxxx
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