Sony BVM-L230 Service Manual page 84

3. Replacement of S1, S2, and S3 boards
Each RGB color sensor (S9702) used for S1, S2, and S3
boards has dispersion in photosensing sensitivity.
Therefore, each RGB color sensor is adjusted once, and the
obtained data is stored in the nonvolatile memory (NVM)
of a backlight unit. RGB color sensors (S9702) must be
adjusted again when replacing S1, S2, and S3 boards due
to failure.
4. Handing RGB color sensors
An RGB color sensor (S9702) significantly influences
backlight control. Therefore, pay careful attention when
handling an RGB color sensor (S9702).
Do not touch the RGB color sensor (S9702) when handing
S1, S2, and S3 boards. Take care that no flaw and dirt
adhere to the RGB color sensor. Wash it with alcohol
when any dirt adhered.
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BVM-L230