White Balance - Daewoo DTP-14V1 Service Manual

2. SCREEN
1) Receive the Retma pattern and heat run over 15 minutes.
2) Adjust the "R, G BIAS, R, G DRIVE" to 0, "B BIAS" to 127, "B DRIVE" to 32.
Adjust the screen volume that the Retma pattern reach to the cut-off point.

3. WHITE BALANCE

1) Receive the Full white pattern and heat run over 15 minutes.
2) Adjust the picture control at the point "Y" value of white balance instrument in
20cd/



.
3) Enter the service mode.
4) Adjust "R BIAS, G BIAS" to x=288, y=301.
5) In order to exit the service mode power off the TV set and power on.
6) Set the TV set to "Normal I" mode(20/21 inch) or set to
"Normal II" mode(14 inch)
7) Enter the service mode.
8) Adjust "R DRIVE, G DRIVE" to x=288, y=301.
9) Repeat above process until the white balance value to x=288, y=301, Y=20,
x=288, y=301, Y=200(approximate) in 2) – 8).
4. FOCUS
1) Apply a RETMA PATTERN signal.
2) Adjust the Focus Volume on FBT to obtain optimal resolution.
5. AGC
1) Set the pattern Generator with


RF LEVEL = 60dBuV


100% FULL COLOR BAR
2) Connect the pattern generator RF output to tuner RF input.
3) Connect the probe of oscilloscope in AGC pin of tuner.
4) Adjust the AGC point to MAX – 1V.
(Simple Method)
1) Receive the pattern.
2) Locate the cursor in "AGC" and adjust using the "VOL +" or "VOL –" keys.
3) Adjust the point there is no noise in about 60dBuV and no beat in about 90dBuV.