[TechAssist] Re: Toshiba 27A41 Intermittent Picture Distortion
- From: "Ed Gaidies" <teltek3@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 21 Jan 2004 11:09:50 -0500
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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