Sony KLV-28R412B Service Manual page 35

3-6. Video Problem
3-6-4. BIL Video (Scart)
SCART CVBS
No Picture
NG
Check [HIGH]
RGB_SWITCH
IC5000 U12
[SOY1] at R3015
OK [LOW]
NG
Check input signal
1.0Vp-p at R3029
OK
Confirm waveform
NG
at C3028 (face IC5000)
same as Ref9
(SCART CVBS
input pattern)
OK
IC5000 defect
BIL Video
Check CN3000
Connection
R3029
connection/defect
Detailed check
CN3000 Pin
No.20 signal path
Ref9
SCART RGB
No Picture
Check
RGB_SWITCH
IC5000 U12
[SOY1] at
Check input signal
0.7Vp-p
at R3029_Y0P line ,
R3031_PB0P line &
R3032_PR0P line
Confirm waveform at
C3024 (face to IC5000)
same as Ref10.
Ref10
Confirm waveform at
C3026 (face to IC5000)
same as Ref11.
Confirm waveform at
C3027 (face to IC5000)
same as Ref12.
Ref11 Input CB pattern.
Ref12
IC5000 defect
R410/412/413/420/422/423/424/425/426/427/428/430/433/435/
450/453/455/470/472/473/475/477/478/480/483/485/M5/M10B
NG
[HIGH]
Check CN3000
Connection
R3015
OK [LOW]
R3029, R3031,
NG
R3032
connection/defect
OK
Confirm C3024 (Y1P line)
connection . Detailed
Check CN3000 Pin No.7
signal path.
NG
Confirm R3025, C3026,
R3021 (PB1P line)
connection and value.
Detailed Check CN3000
Pin No.11 signal path.
Confirm R3026, C3027,
R3022, C3016 (PR1P line)
connection and value.
OK
Detailed Check CN3000
Pin No.15 signal path.
ITC3
CHASSIS
35