Trimpot Orientation Redesign
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When working with the trimpots, always always make sure that you look at the labels on
each knob. Turning the wrong knob of the function you are looking for could
"ruin" your set.
A number of recent production TW56x81 units have the trimpot panel REVERSED.
Instead of the Screen VR knobs on top and the Focus knobs on the bottom, the Focus knobs
are on top and the Screen VR knobs are on the bottom. The knobs actually read BGR as
opposed to RGB. This might be a redesign because the panel does not read upside
down. All the letterings are right side up.
This is contrary to what the service manuals depict. We can only speculate that
this along with convergence
grid errors in the manual probably caused Toshiba or the manual publisher to
discontinue the service manual.
At any rate, unknowingly and unintentionally turning the Screen VR knobs while trying
to adjust the focus will wreak havoc on the grayscale. This will consequently
require an expensive visit from an ISF calibrationist. And unless one has the
defaults for that TV recorded some place, there's no guarantee it will be restored.