Blue De-Focus Adjustment - Sony KP-57XBR10W Service Bulletin

TV Products Service Bulletin No. 531

Blue De-Focus adjustment

pleasing picture). Same setup/conditions as for the previous adjustment, except select the Vivid mode (reset
the Vivid Mode to ensure proper settings).
Confirmation / Adjustment:
Correct: blue dot in center of
the screen has a vertical oval
1. Adjust the blue focus VR to the CW (under focus) slightly while looking at the left side of the screen.
2. When the blue horizontal luminance line (not flare) starts to increase in size, stop turning the VR. The
Vertical or Horizontal width of the blue luminance line should be no larger than x1.5 the size of the
green line.
3.
Turn the green CRT back on to confirm the size of blue in reference to green.
NOTE:
This adjustment will of course make a slight blue outline visible on the white lines, however an
additional blue flare may be seen (halo around the blue luminance lines). If the additional blue flaring is seen,
(see picture below) it may be necessary to adjust the blue lens mechanical focus. The blue flare should be
minimized as much as possible; adjust to best position, which has the least amount of flare.
See photo below: Far left side should have a slight blue edge in Vivid mode with a 100-IRE hatch.
Blue Flaring
Example:
If too much blue flare is
seen, then adjust blue
mechanical lens focus
Red and Green dot should be
round
The Blue dot should be Oval in
shape. The vertical should be 1.5
x the horizontal size
(The blue focus needs to be slightly defocused so to produce a more
Incorrect: blue dot in center of
the screen has a horizontal oval