[TechAssist] Re: Toshiba 27A41 Intermittent Picture Distortion
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
- Date: Wed, 21 Jan 2004 10:24:02 -0800
Ed,
please explain 'palming'
Peggs
At 08:09 AM 1/21/04, Ed Gaidies wrote:
>Bob;
>Toshiba did have problems with the Shadow mask weld on those sets. But
>normally was never an intermittent problem. May try palming the tube on
>the offending corner. I have replaced numerous sets for Purity problems,
>since no CRT's are available for replacement. Although you description
>doesn't sound like what you could expect to see.
>
>-Ed-
>
>Ed Gaidies
>Tel-Tek Electronics.
>Ontario-Canada
>
>teltek3@xxxxxxxxxxxx
>
>-----Original Message-----
>From: techassist-bounce@xxxxxxxxxxxxx
>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Christopher Barnak
>Sent: January 21, 2004 9:15 AM
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Re: Toshiba 27A41 Intermittent Picture Distortion
>
>I think the shadow mask is bad inside the picture tube. Especially when
>you mention purity problems. Maybe the auto deguasser, but I don't
>think so.
>
>
>Christopher Barnak, CET
>Norfolk Public Schools
>School Plant Facilities
>966 Bellmore Ave.
>Norfolk, Va. 23504
>
>Phone 757 628 3385
>Fax 757 628 3392
>cbarnak@xxxxxxxxxxxxx
>
> >>> geminitv@xxxxxxxxxxxxxxxx 1/21/04 8:27:10 AM >>>
>
>I currently have a Toshiba model 27A41 that has a very intermittent
>video
>distortion that is rather hard to describe and unfortunately my digital
>camera is at a different location. I will attempt to get it so I can
>hopefully get a good picture of it and post it to my website later
>because
>we all know a picture paints a thousand words in a case like this. I
>have
>ONLY noticed this symptom on the RF input but have not yet determined if
>it
>occurs using any of the video inputs (composite, component, or S-Video).
>I
>am now running a DVD using composite video to see if it does occur
>there.
>The best way I can describe the symptom is that first I do not notice
>any
>audio problem at all, only the video (or raster) is affected. The
>picture
>will get these vertical distortion lines like it is breaking up (no loss
>of
>sync though) and at that time when this occurs, there are bands of
>purity
>distortion that accompany the distortion. It can occur from a dead cold
>start within a minute or the set can run for hours and then act up. I
>have
>been all over the board with jewlers goggles and a jewelers loupe and
>can
>find no cracks or bad solder. I cannot induce the symptom by tapping the
>board nor by freezing or heating it. The symptom is completely random.
>So
>far I have replaced the following components yet the symptom remains:
>
>Tuner (TU001)
>IC201
>IC701
>IC1501
>
>So if someone has some suggestions, I am all ears.
>
>Bob Waterman, CETR #RI-28
>Master Technician License #9109
>Service Manager / Parts Manager
>Gemini Computer, TV, & Security Alarms
>(508)695-7302
>(508)695-7769 FAX
>geminitv@xxxxxxxxxxxxxxxx
>geminitv@xxxxxxx
>www.geminicomputertvsecurityalarms.com
>
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