LG 30FZ4D, Service Manual

- 15 -

RING
PAIRS

4

POLE

ROTATION DIRECTION

OF BOTH TABS

OPPOSITE

SAME

OPPOSITE

SAME

MOVEMENT OF RED

AND BLUE BEAMS

B

B

R

R

OR

OR

B

R

B

R

OR

B

R

B

R

B

R

OR

B

R

6

POLE

12. While watching the 6 o'clock positions on the screen, rock the

front of the yoke in a vertical (up/down) direction to converge
the red and blue vertical lines. (Fig upper left)

13. Temporarily place a rubber wedge at the 12 o'clock position

to hold the vertical position or the yoke.

14.  Check the 3 o'clock and 9 o'clock areas to confirm that the red

and blue horizontal lines are converged.
If the lines are not converged, slightly offset the vertical tilt of the
yoke (move the rubber wedge if necessary) to equally balance the
convergence error of the horizontal lines at 3 o'clock and 9 o'clock
and the vertical lines at 6 o'clock and 12 o'clock.

15. Place a 1.5 inch piece of glass tape over the rubber foot at

the rear of the 12 o'clock wedge.

16. While watching the 6 o'clock and 12 o'clock areas of the

screen, rock the front of the yoke in the horizontal (left to
right) motion to converge the red and blue horizontal lines.
(Fig. upper right)

17. Temporarily place a rubber wedge at the 5 o'clock and 7

o'clock positions to hold the horizontal position of the yoke.

18. Check the 3 o'clock and 9 o'clock areas to confirm that the

red and blue vertical lines are converged. If the lines are not
converged, slightly offset the horizontal tilt of the yoke (move
the temporary rubber wedges if necessary) to equally
balance the convergence error of the horizontal lines at 6
o'clock and 12 o'clock and the vertical lines at 3 o'clock and 9
o'clock.

19. Using a round magnet confirm purity at the center, right and

left sides and corners. See Purity Adjustment Procedure.

20. Reconfirm convergence and apply a 1.5 inch piece of glass

tape over the rubber foot at the rear of the 5 o'clock and the 7
o'clock wedges.  

RED

BLUE

RED

BLUE

BLUE

RED

GREEN

GREEN

BLUE

RED

GREEN

GREEN

ADJUSTMENT

VIEWING

AREA

 UP/DOWN ROCKING OF THE YOKE
CAUSES OPPOSITE ROTATION OF RED
AND BLUE RASTERS

ADJUSTMENT

VIEWING

AREA

RED

RED

GREEN

TV
SCREEN

 LEET/RIGHT ROCKING OF THE YOKE
CAUSES OPPOSITE SIZE CHANGE OF 
THE RED AND BLUE RASTERS

UP/DOWN ROCKING OF THE YOKE CAUSES
OPPOSITE ROTATION OF RED AND BLUE
RASTERS

LEFT/RIGHT ROCKING OF THE YOKE
CAUSES OPPOSITE SIZE CHANGE OF
THE RED AND BLUE RASTERS

PURITY & CONVERGENCE ADJUSTMENT