47LB9DF (CHASSIS:LB75A) - LG TV Service Manual (repair manual). Page 13

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These instructions are applied to all of the LCD TV, LB75A
Chassis.

2.1 Because this chassis is a non-charge type chassis of

power supply insulation, it does not require an insulation
type transformer. But it is preferable to use an insulation
type transformer between the power supply line and the
chassis input side to operate it before the adjustment. 

2.2 The adjustment must be done in the accurate order. But it

can be changed considering the mass production
capability.

2.3 Unless specified specially, the adjustment must be done

in an environment with the surrounding temperature of 25
±5°C and relative humidity of 65 ±10%.

2.4 The  input  voltage of the receiver during the adjustment

must be maintained at 220V, 60Hz.

2.5 Unless specified otherwise, the receiver must be pre-

operated for 15 minutes before the adjustment. 

Caution) When you keep the still screen on for more than 20

minutes (Especially for internal Digital pattern (13
CH), Cross Hatch Pattern (09CH) with higher
black/white contrast), be careful not to create
residual image on the black level part.

- Adjust MST3361-Set
- Adjust Video-Set

4. EDID(The Extended Display 
Identification Data) / DDC
(Display Data Channel) Download

This has been established by VESA and is the function
created to "Plug and Play" by making the computer
reconfigure user environment through communication with
the monitor automatically without having the user set
commands directly to the PC or the monitor so that the user
can use it immediately.

When writing EDID, use the DDC2B protocol.

1) Using device

a. Jig for PC, DDC adjustment (PC serial to D-sub

connection device)

b. DDC recording S/W (EDID Data Write & Read)
c. D-Sub terminal
d. Separate HDMI Cable connecting JIG is necessary

2) Adjustment preparation and device configuration

a. Configure as Fig., and turn on the PC 

b. Run the DDC recording S/W (EDID Data Write & Read).

(Execute in DOS mode)

LCD TV SET

(or Digital Board)

Device configuration diagram for HDMI EDID Data input