TOSHIBA 50HP81
Service Manual

5.4.

PAL/SECAM panel white balance
INPUT Equipment Color Analyzer Setting Picture: Normal Sub Adjust White balance: Sub Bright Cool Aspect: PANEL W/B 16:9 G cut off PANEL W/B B cut off R cut off Sub Adjust Sub Bright Alignment menu Procedure 1) Find the nearest area to brightness of 10 cd/m2 as Low light by color sensor. 2) Adjust Sub bright to set Low light level to 10 cd/m2 exactly. 3) Set G cut off to " 80 ". 4) Adjust B and R cut off to set color temperature as shown Fig.-02. 5) If Sub Bright is changed re-adjust it to set Low light to 10 cd/m2. 6)Find 75% of white area by color sensor. PANEL W/B G Drive 7) Set G Drive to " D8 ". PANEL W/B B Drive 8) Adjust B and R Drive to set color temperature R Drive as shown Fig.-02. 9) Repeat procedure 4) to 7) to set both Low light and high light. PANEL W/B R,G,B Drive 10) Increase same steps of R, G and B Drive to set R,G,B Drive largest level of 3 color drive to "FC". PANEL W/B R,G,B cut off 11) Re-adjust Low light level again. Color Temp. Cool(Hi) Normal(Mid) Warm(Low) x 0.272 0.288 0.313 Fig. -02 y 0.290 0.296 0.329

1 PAL Gray Scale Pattern

High light 75% Low light 15%

2

Picture:

1) Change white balance to "Normal".

Normal PANEL W/B White balance: R,G,B cut off 2) Repeat procedure 3) to 11) of Cool mode. Normal PANEL W/B Aspect: R,G,B Drive 16:9

3

Picture:

1) Change white balance to "Normal".

Normal PANEL W/B White balance: R,G,B cut off 2) Repeat procedure 3) to 11) of Cool mode. Warm PANEL W/B Aspect: R,G,B Drive 16:9

4

Picture Menu 1) Change color templature to "Cool". Normal Sub Adjust White balance: Sub Bright 2)Re-set Sub bright to "30" Cool Aspect: 16:9

Picture:

18