Philips 26MD257B/37 Service Manual page 178

76
TPM1.0U LA
8.1.3. YPbPr mode display adjustment
8.1.3.1 White Balance adjustment (B)
General set-up :
Equipment Requirement: Minolta CA-110 or Equivalent Color analyzer
Input requirements:
Input Signal Type
Input Signal Strength : 1 Vpp for Y signal ; 350 mVpp for Pb & Pr signal
Input Injection Point : AV1 YPbPr (RAC jack)
Alignment method:
Quantum Data Pattern Generator 801GD or 802G or Fluke 54200
: YPbPr signal
1.1080i mode, SMPTE color pattern by 801GD or 802G.or 576i (PAL
system), color bar with black/white pattern by Fluke 54200.
2. Select Smart picture to
1080i, SMPTE color pattern.
576i (PAL system), color bar with black and white pattern
Initial Set-up:
1. Select source as
2. Set Smart picture as "Personal" and to be Contrast
Brightness=50
3. Apply "SMPTE color" pattern or "color bar with black & white" pattern by signal
4. Enter factory mode menu: press MENU + Numeric keys "062596" + MENU key
mode menu). Then select "Factory" item.
Alignment:
1. At FAC mode
ADC_GAIN_R, ADC_GAIN_G, ADC_GAIN_B and ADC_OFFSET_R, ADC_OFFSET_G,
ADC_OFFSET_B. Then store those values to NVM.
2. Apply full white pattern.
3. Set color temperature to "NORMAL".
4. Copy CLR_TEMP_R, CLR_TEMP_G and CLR_TEMP_B values from "NORMAL" color
temperature in Analog TV mode. Check whether (x,y) color coordinates meet "NORMAL"
color specification below. If color coordinates are out of specification, fine-tune
CLR_TEMP_R, CLR_TEMP_G and CLR_TEMP_B values. Then store those values to
NVM.
5. Set color temperature to "WARM".
6. Copy CLR_TEMP_R, CLR_TEMP_G and CLR_TEMP_B values from "WARM" color
temperature in Analog TV mode. Check whether (x,y) color coordinates meet "WARM"
color specification below. If color coordinates are out of specification, fine-tune
CLR_TEMP_R, CLR_TEMP_G and CLR_TEMP_B values. Then store those values to
NVM.
7. Set color temperature to "COOL".
8. Copy CLR_TEMP_R, CLR_TEMP_G and CLR_TEMP_B values from "COOL" color
temperature in Analog TV mode. Check whether (x,y) color coordinates meet "COOL" color
specification below. If color coordinates are out of specification, fine-tune CLR_TEMP_R,
CLR_TEMP_G and CLR_TEMP_B values. Then store those values to NVM.
Color temperature Normal/Warm/Cool (x, y) co-ordinates specification:
Picture Mode
o
Normal (8500 K)
o
WARM (6500 K)
o
COOL( 11500 K)
8. Alignments
Personal mode and check the x, y data.
"AV1".
(LPL) , at normal menu mode.
menu, select AUTO_COLOR item. Then press "OK" key to adjust
x
0.291±0.010 0.302±0.010
0.314±0.010 0.324±0.010
0.273±0.010 0.280±0.010
=50 (LPL),
generator.
(FAC
y