LG 55EA8800, Service Manual

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Only for training and service purposes
5.1.3. Equipment connection
5.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
RS-232C COMMAND
Explanation
CMD DATA ID
Wb 00 00 Begin White Balance adj.
Wb 00 ff End White Balance adj.
(internal pattern disappears )
(2) Adjustment Map
Adj. item Command
(lower caseASCII)
Data Range
(Hex.)
CMD1 CMD2 MIN MAX
Cool R Gain j g 00 C0
G Gain j h 00 C0
B Gain j i 00 C0
Medium R Gain j a 00 C0
G Gain j b 00 C0
B Gain j c 00 C0
Warm R Gain j d 00 C0
G Gain j e 00 C0
B Gain j f 00 C0
5.1.5. Adjustment method
5.1.5.1. Auto WB calibration
(1) Set TV in ADJ mode using P-ONLY key (or POWER ON
key)
(2) Place optical probe on the center of the display
- It need to check probe condition of zero calibration before
adjustment.
(3) Connect RS-232C Cable
(4) Select mode in ADJ Program and begin a adjustment.
(5) When WB adjustment is completed with OK message,
check adjustment status of pre-set mode (Cool, Medium,
Warm)
(6) Remove probe and RS-232C cable.
▪ W/B Adj. must begin as start command “wb 00 00” , and
finish as end command “wb 00 ff”, and Adj. offset if need
5.1.5.2. OLED White balance table
(1) Cool Mode
- Purpose : Especially B-gain fix adjust leads to the
luminance enhancement. Adjust the color temperature to
reduce the deviation of the module color temperature.
- Principle : To adjust the white balance without the
saturation, Adjust the B gain more than 192 ( If R gain or G
gain is more than 255 , G gain can adjust less than 192 )
and change the others ( R/G Gain ).
- Adjustment mode : mode – Cool
(2) Medium / Warm Mode
- Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature
- Principle : To adjust the white balance without the
saturation, Fix the B gain to 192 (default data) and
decrease the others
- Adjustment mode : mode – Medium
(3) Warm
- Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
- Principle : To adjust the white balance without the
saturation, Fix the W gain to 192 (default data) and
decrease the others.
- Adjustment mode : mode – Warm
(4) THX(Warm)
- Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
- Principle : To adjust the white balance without the
saturation, Fix the W gain to 192 (default data) and
decrease the others.
- Adjustment mode : mode – Warm
- Auto White balance 4 point
- Adjust 100 IRE White Balance
- Adjust Gamam 2.2 each IRE (60, 40, 20). Using max
luminance
- Complete 4 point gamma, W/B.
Picture is H 1/3, V 1/3
fixed Center Window size
Outer Black Picture do not need change Contrast / Brightness
Center Level can change Contrast / Bright
Window pattern of Center 0~255 level