[TechAssist] Re: Sony 20" monitor Intermittent poor Focus
- From: "Ty Kraemer" <ty1k@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 11 Dec 2002 07:46:01 -0800
----- Original Message -----
From: "peggs" <peggs@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, December 11, 2002 5:25 AM
Subject: [TechAssist] Re: Sony 20" monitor Intermittent poor Focus
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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