[TechAssist] Re: Sony 20" monitor Intermittent poor Focus
- From: "Jose Reyes" <jr@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 11 Dec 2002 11:20:30 -0500
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
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