No Picture Ch/Mx/Pa/Col/La (Bmfl/Bmfw) - Sony XBR-55X850C Service Manual

3-5-3. No Picture CH/MX/PA/COL/LA (BMFL/BMFW)

Video 1
No Picture
NG
* Check J7505
Check if input OSD
Connection,
is GREY OUT
VIDEO2_DET
OK if it is highlighted
At R7562
OK
**
Detailed check all
parts at VIDEO2_DET
Signal Path [R7561]
NG (Vpp: 0 V)
Check wave between
C7511 and IC1000
OK (Vpp: 1 V)
Muffin [IC1000] J7505 Connector
Problem Problem
[All voltage measurement using Oscilloscope]
XBR-55/65X850C, 855C, 857C, 75X850C, 855C
No Picture Video
NG (Vpp: 0 V)
OK (Vpp: 3.3 V)
NG (Vpp: 0 V)
OK (Vpp: 3.3 V)
**
Detailed check all parts
at CVBS2P signal path
[D7514/R721/C7521/
R7519/C7534]
OK
J7505 Connectivity
Problem
Video 2
No Picture
NG
Check if input OSD
is GREY OUT
OK if it is highlighted
OK
NG
NG (Vpp: 0 V)
Check wave between
C7512 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
* Check J7504
NG (Vpp: 0 V)
Connection,
VIDEO_DET
At R7539
OK (Vpp: 3.3 V)
NG (Vpp: 0 V)
** Detailed check all
parts at VIDEO_DET
Signal Path [R7535]
OK (Vpp: 3.3 V)
**
Detailed check all parts
at CVBS3P signal path
[D7530/R7524/R7525]
J7504 Connector J7504 Connectivity
Problem Problem
 OK Condition : No part short-circuited
**
 NG Condition : Part short-circuited
NG
OK
Parts Broken
159