42LY3DE-AA (CHASSIS:LB75B) - LG TV Service Manual (repair manual). Page 12

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These  instructions  are  applied  to  all  of  the  LCD  TV,  LB75B
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
- Adjust White Balance 

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 and Jig

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