[TechAssist] Re: Toshiba 27A41 Intermittent Picture Distortion
- From: <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 21 Jan 2004 08:24:51 -0600
Sounds like loose shadow mask inside CRT.
Take the palm of your hand and slap the face of crt and look for symptom.
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 21, 2004 7:27 AM
Subject: [TechAssist] Toshiba 27A41 Intermittent Picture Distortion
> 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, CET® #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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