KV-AR253M50 - Sony TV Service Manual (repair manual). Page 30

Read Sony KV-AR253M50 Service Manual online

– 30 –
KV-AR253M50
RM-W104
3-3. PICTURE QUALITY ADJUSTMENT
SUB COLOR ADJUSTMENT
1. Select Video.
2. Input PAL 100% Color Bar.
3. Set to following condition:
PICTURE 100%,COLOR 50%, BRIGHTNESS 50%, HUE
Center, SHP 50%.
4. Set the PICT 006 WTS to 00h.
5. Connect an oscilloscope to pin 2 (B OUTPUT) of CN004
A Board.
6. Set the service mode and select  SADJ 004 "SCOL" with
1
 and 
4
 of the commander then adjust to
VB2=VB3=VB4 with 
3
 and 
6
 (For PAL), write the data
as below :
Add 2 steps to SCOL (PAL) - 25" and 29".
Add 6 steps to SCOL (PAL) - 34".
7. Copy "SCOL 50 PAL(Video)"data to "SCOL 50
SECAM(Video)"
8. Copy "SCOL 50 PAL(Video)" and "SCOL 50 SECAM
(Video)" data to "SCOL 50 PAL(TV)" and "SCOL 50
SECAM(TV)" table.
9. Input NTSC 75% Color Bar to TV set and repeat item
3-5.
10. Set the service mode and select SADJ 004 "SCOL" with
1
 and 
4
 of the commander then adjust to
VB1 = VB4. Write the data as below :
Add 5 steps to SCOL (NTSC) - 25"
Add 3 steps to SCOL (NTSC) - 29".
Add 6 steps to SCOL (NTSC) - 34".
11. Copy "SCOL 60 NTSC(Video)"data to "SCOL 60
NTSC(TV)"
12. Copy "SCOL 50 PAL"data to "SCOL 50 YUV" table and
"SCOL 60 NTSC" data to "SCOL 60 YUV".
13. Set WTS back to original data.
VB2 = VB3 = VB4(For PAL sub color adjustment)
VB1 = VB4(For NTSC sub color adjustment)
(Difference is within 70mV)
VB1
VB2
VB3
VB4
Sub Hue Adjustment For YUV input
1. Select YUV input.
2. Input NTSC 3.58 Color Bar into YUV mode.
3. Connect an oscilloscope to pin 2 (B output) of CN004.
Set the service mode and select YC 013 "TINT" with 
1
and 
4
 of the commander then adjust to
VB1=VB2=VB3=VB4 with 
3
 and 
6
.
5. Then press [MUTING] 
-
 to write the data.
The highest level of VB1, VB2, VB3, VB4 must be aligned at
the same line.
The ideal difference between VB2 and VB3 is within ± 80mV.
PMAX/CONTRAST ADJUSTMENT
Picture Mode: Personal
1. Select Video mode.
2. i)Input PAL Color Bar toTV set. (Other)
ii)Input NTSC 75% Color Bar (NTSC model).
3. Set the following condition:
PICTURE 100%, COLOR 0%,BRIGHTNESS 50%
4. Connect oscilloscope to pin 4 (R Output) of CN004.
5. Set to Service Mode "PWL" PICT 003 to 00h and WHBL
017 "BLBG" to 01h.
6. Select SADJ 000 "PMAX" with 
1
 and 
4
 of the
commander then adjust VR within spec with 
3
 and 
6
.
VB1
VB2
VB3
VB4
VB1 = VB2 = VB3 = VB4
80mV
VR
NTSC
1.85±0.03Vpp
1.57±0.03Vpp
1.85±0.03Vpp
34"
29"
25"
PAL
2.15±
0.03Vpp
2.15±
0.03Vpp
2.15±
0.03Vpp
VR
Black
Page of 67
Display

Click on the first or last page to see other KV-AR253M50 service manuals if exist.