Sony TRINITRON KD-28DX50U Service Manual page 21

Geometry Adjustment.
Preparation:
Before starting this adjustment, adjust the horizontal and
vertical static convergence.
1. Remove the deflection yoke spacer.
2. Tilt the deflection yoke as indicated in the figure below and
optimise the geometry.
Tilting the DY Up and Down will balance the upper and
lower pin adjustment.
Tilting the DY Left and Right will balance the H-Trap
adjustment.
3. Re-install the deflection yoke spacer.
Tilt Direction
HTIL Adjustment
Deflection Yoke
TLH pieces
HTIL correction can be performed by adding a TLH correction
assembly to the Deflection yoke.
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YCH Adjustment
+
YCH VR
+ +
Deflection Yoke
TLV Adjustment
+
TLV VR
+ +
Deflection Yoke
Screen Corner Convergence
If you are unable to adjust the corner convergence properly,
this can be corrected with the use of permalloy magnets.
a
a-d: screen-corner
convergence defect
c
Install the permalloy assembly
for the area that needs correcting.
b
Permalloy Assy
X-4387-214-1
d
Convergence adjustment with permalloy
b
d
a
c