[TechAssist] Re: Zenith Red convergence problem
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 14 Nov 2002 08:20:42 -0500
The Zenith PTVs have a "WM" control on red/blue convergence that compensates
for the Vert S shape....also have a "gull wing control" but I don't recall
the control's name. That affects both sides of the vertical much like a sea
gulls wings are designed (sides move up/down but center doesn't move).
Normally they are found on the right-most side of the vertical adjustments,
but I've also found some of the vertical controls spill over into the
horizontal row on the right. I dont' have the info in front of me, this is
from memory.
----- Original Message -----
From: "Matt" <matt@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 13, 2002 4:53 PM
Subject: [TechAssist] Zenith Red convergence problem
>
> I'm working on a Zenith (Hitachi) IQB55M90W which had a beverage spilled
> on it. The liquid flowed down the front of the screen and zapped the
> control panel board and then continued on to render the convergence
> correction board defunct. I was able to wash and refurb the control
> panel board, and I replaced the convergence correction board. After
> spending an hour tweaking the pots on the new convergence board, I was
> able to get the green and blue properly adjusted and alligned. The red
> image is malformed in a fashion that I can't seem to compensate for
> using the dynamic convergence controls. It appears almost as though the
> vertical pincushion is way off(such that the image is vertically
> squashed), but only on the left edge. Also, at the top of the red
> image, there is an upward bulge left-of-center and a downward bulge
> right-of-center such that a slight almost s-curve is formed. I have
> tried every permutation of pincushion, keystone, and skew that I can
> conceive. I'm thinking that there may be a problem with this
> convergence board.
>
> Matt Graham
> Birmingham, AL
>
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