MAIN BOARD
SCREEN VR
(Under side)
(1) Receive a monochrome circular pattern.
(2) Set the brightness and colour to normal, contrast to maximum.
(3) Enter to the service mode.
(4) Select No.
32 RBIAS (R), 33 GBIAS (G), 34 BBIAS (B), and No. 39 WHITE BALANCE and set each data to 0 by pressing
the VOLUME + or - key.
(5) Select No. 39 WHITE BALANCE (R-Drive and B-Drive) and set data to 3F by pressing the VOLUME + or - key.
(6) Turn Screen Control on the FBT (T471) to minimum (fully counter-clock-wise).
(7) Select No. 38 (1-line appear).
(8) Advance Screen Control clockwise to obtain just visible one colour line. If line does not appear, place this control to
maximum (fully clockwise).
(9) Raise each CUT OFF Level with 1, 2, 3, 4, 5 and 6 keys to obtain just visible white line.
(10) Select No. 39 WHITE BALANCE (Drive Adjustments).
(11) Adjust Red and Blue Drive Levels alternately with 1, 3, 4 or 6 key to produce normal black and white
picture in highlight areas.
(12) Check for proper grayscale at all brightness levels. To turn off the TV Service Menu display, press the MENU key.
Note: If the Grayscale adjustment is made after picture tube replacement, check the High Voltage
Items 32 - 39 GREY SCALE
S. SYS
.
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