[TechAssist] Re: Hitachi PTV 50UX10B, distortion in pix
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 21 Oct 2003 07:35:57 -0500
Generally when you find a "spot" you can't get rid of, or while adjusting it
suddenly distorts....I've found that I have pushed the alignment to the
extreme, causing foldover, distortion etc.
First thing I'll do is identify if this is the case by reducing the up/down
or left/right of the distorted area, (ie see if it'll settle them down) . If
so, that tells me the signal is at it's extreme, and I need to compensate
that by readjusting all other points IN THE SAME DIRECTION (if it settles
down by reducing the offending points down, VVV then leave those points
there, adjust the points overall upwards^^^ to get the Offending points back
where they belong.
I've had that happen several times near the top on Hitachi PTVs. Worst thing
is....no mylar alignment jig to help you, so centering is about the only way
to start.
HTH
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, October 20, 2003 3:15 PM
Subject: [TechAssist] Hitachi PTV 50UX10B, distortion in pix
> Techs,
>
> I have never seen a problem like this. Came in with terrible convergence
> problem. Replaced IC1326/STK4274 and a bunch in caps in the 900 series
> (power supply).
>
> Set has a super picture--except for the area maybe 3 to 6 inches from the
> left side of screen. Doesn't show up on most scenes, but if a crosshatch
> is applied, all horizontal lines will have a "wiggle" in the lines 3 to 6
> inches from the left side. Like a sideways "S", but not real pronounced.
> My tech says it's only in the green, but I'm not convinced. He worked
> on it many hours Sunday when I wasn't here.
>
> Customer saw the set today and say they will accept the set "as is," but
> would like the distortion corrected if it doesn't add too much to the
> cost of repair. To be honest, I am totally baffled. My tech thinks
> vertical circuit, I tend to think horizontal distortion. But, at any
> event, the convergence is off only in that area. When volume is raised
> (or lowered) the volume bar displayed is misconverged in the trouble
> area.
>
> This may be just an interesting problem to consider since the customer
> has agreed to take the set as is. Yet, someone may have seen this and
> may shed some light on it.
>
> Thanks for your consideration on this.
>
>
> Ken Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL 32563
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
>
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