No Picture Aep Destination (Bmfl/Bmfw) Scart - Sony XBR-55X850C Service Manual

3-5-1. No Picture AEP Destination (BMFL/BMFW) SCART

SCART RGB
No Picture
NG
[LOW: 0V]
Check SCART_FB
* Check CN7501
IC1000 L37
Connection
[SOY0] at R7514
OK [HIGH: 0.4V  Composite]
OK [HIGH: 3V  RGB]
NG (Vpp: 0 V)
Check wave between
C7502/C7505/C7507
and IC1000
OK (Vpp: 1 V)
Muffin [IC1000] CN7501 Connectivity
Problem Problem
[All voltage measurement using Oscilloscope]
XBR-55/65X850C, 855C, 857C, 75X850C, 855C
No Picture AEP
NG
OK
** Detailed check all parts
at SCART_FB signal
Path [VD7504/R7513]
NG
OK
** Detailed check all parts at
CN7501 along signal path
at Pin No:
7 : [VD7503/R7503/C7501/
R7504]
11 : [VD7502/R7506/C7503/
R7507]
15 : [VD7501/R7510/C7506/
R7511]
OK
CN7501 Connector
Problem
SCART CVBS
No Picture
NG
[LOW: 0V]
Check SCART_FB
IC1000 L37
[SOY0] at R7514
OK [HIGH: 0.4V  Composite]
OK [HIGH: 3V  RGB]
NG (Vpp: 0 V)
Check wave between
NG
C7511 and IC1000
OK (Vpp: 1 V)
Muffin [IC1000]
Parts Broken
Problem
 OK Condition : No solder splash can be seen
*
 NG Condition : Solder splash can be seen
TROUBLE SHOOTING
NG
* Check CN7501
Connection
OK
NG
** Detailed check all parts
at SCART_FB signal
Path [VD7504/R7513]
OK
Detailed check all parts at
CN7501 along signal path
at Pin No:
20 : [D7505/R7518/C7510/
R7599/R7519]
CN7501 Connectivity
CN7501 Connector
Problem Problem
 OK Condition : No part short-circuited
**
 NG Condition : Part short-circuited
NG
OK
Parts Broken
157