LC-30AD1E (serv.man7). adjustment procedures - Sharp TV Service Manual (repair manual). Page 2

5. Adjustment

5-1.VLS BIAS (13V) voltage adjustment (R4231)

Connect a digital volt meter to TL4122 (or C4180+) on the LCD Control PWB and make a adjustment with
the R4231 so that the voltage becomes 13.00±0.05V.

5-2.COM BIAS adjustment

Shift to the "COM BIAS" item with the cursor UP/DOWN key and select a numeric value with the cursor
RIGHT/LEFT key.
Changing the numeric value with the cursor UP/DOWN key will make appear the test pattern.  Make an
adjustment so that the flicker near the center of the screen is minimized.

5-3.Background adjustment

Start up the set with the AVC System connected and adjust the background of the monitor.

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 Procedure

-1) Display the adjustment screen (200-level gray scale on High side, 48-level gray scale on Low side).
-2) Adjust "R OFFSET", "G OFFSET" and "B OFFSET" so that the 200-level gray scale pattern becomes

normative.
Adjust the chromaticity of the High pattern (in the left portion of the screen) so that x = 0.275 and y =
0.273.

-3) Adjust "R GAMMA", "G GAMMA" and "B GAMMA" so that the 48-level gray scale pattern becomes

normative.
Adjust the chromaticity of the Low pattern (in the right portion of the screen) so that x = 0.269 and y
= 0.252.

The above-mentioned adjustments can be made according to the following procedure.