White Balance Adjustment - Sharp LC-40LE812E Service Manual

LC-40/46LE812E, LC-40/46LX812E, LC-40/46/52LE822E, LC-40/46LU822E (1st Edition)

12. White Balance Adjustment

For white balance adjustment, adjust the offset values on pages 11/21.
[Condition of the unit for inspection]
[Input signal condition]
[Adjustment reference device]
[Adjustment procedure]
1) Display the current adjustment status at R/G/B_GAIN (HI). (Page 11/21 of process adjustment)
The signal of 78IRE is input.
2) Read the value of the luminance meter. x = 0.272, y = 0.277
3) Change R_GAIN (HI)/B_GAIN (HI) (Adjustment offset value) on page 11/21 of process adjustment so that the values of the luminance meter
approach x = 0.272 and y = 0.277.
(Basically, G is not changed. If adjustment fails with R and B, change G. When G is lowered, the weaker of R or B must be fixed.)
4) Display the adjustment status of the current R/G/B_GAIN (LO).
The signal of 15IRE is input.
Change R_GAIN (LO)/B_GAIN (LO) (adjustment offset value) on page 11/21 of process adjustment so that the values of the luminance meter
approach x = 0.272 and y = 0.277.
5) Both HI and LO are repeating the step from 1 to 4 until becoming an aim value.
[Adjustment reference standard value]
Adjustment spec ± 0.002
Adjustment spec ± 0.001
6) After completing adjustments, set EEP SAVE (21/21) to ON in the process menu to save the white balance adjustment value.
13. Confirmation item
1. HDMI-CEC Inspection
After repairing the CEC function, check the operation about HDMI-CEC circuit
2. CI card Inspection
After repairing the CI function, check that the DTV signal is received in the UK setting by inserting CAM
And check the KEY certification by inserting CAM which is prepare for CI+
3. LAN Inspection
After repairing the LAN function, check the communication by connecting PC and LAN terminal.
: Modulated light (+16), Colour temperature (High)
AV MODE: DYNAMIC
Active Backlight: OFF
OPC: OFF
Asing Time: Min,60 minute
: HDMI 1080i 15IRE (LO), 78IRE (HI)
: Minolta CA-210
Inspection spec ± 0.004 (point LO)
Inspection spec ± 0.002 (point HI)
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