How to change pre-emphasis integer value by serial data processing in service mode

摘要

The present invention relates to a method of changing a pre-emphasis integer value by serial data processing in a service mode, and more particularly, to a service mode in which a worker conducts a service work in circuit- The operator can change the integer value of the pre-emphasis circuit built in the desired video processing IC by using the serial data.;To this end, the present invention comprises a first step of determining whether a data change mode based on the i-pill is selected in a service mode; When the data change mode based on the i-rom is set in the first step, the OSD guide screen displays the serial data of the PIIOM, and determines whether the pre-emphasis integer value is selected by the serial data by the i- step; And a third step of changing the constants of the pre-emphasis circuit to a new value when the pre-emphasis circuit constant value is selected as a result of the determination in the second step.