Sony PFM42V1 Triage & Troubleshooting Manual page 50

YDT
Board
&
Drive
Ysus ICs
Scan
Board
YDB
Board
&
Drive
ICs
XL address Brd
YDT
Board
&
Drive
ICs
Ysus
Scan
Board
YDB
Board
&
Drive
ICs
XL address Brd
YDT
Board
&
Drive
ICs
Ysus
Scan
Board
YDB
Board
&
Drive
ICs
XL address Board
PDP-04
1
connections between YDT
and Panel Assembly .
Zsus
Scan
Board
Replace Panel Assembly if
flex cable is damaged
XC address Brd XR address Brd
1
connections between YDB
and Panel Assembly
Zsus
Scan
Board
XC address Brd XR address Brd
1
board depending on where the
Zsus
horizontal black bar is located on
Scan
the screen .
Board
Note: One drive IC fails on the YDT or YDB board
fails causing the successive drive ICs to not function.
This symptom (a Black Bar less-than ½ the screen )
can be located in the top or bottom half of the screen
depending on if the failed IC is on the YDT or YDB
XR address Board
board .
Single Horizontal Black Line (upper half of screen )
st
– Confirm secure nd
2 – Check the drive ICs on
the YDT board for physical
damge .
Replace YDT board if Ics are
damaged .
Single Horizontal Black Line (lower half of screen )
st nd
2
– Confirm secure – Check the drive ICs on
the YDB board for physical
damage .
Replace YDB board if ICs are
damaged .
Single Defective Driver Board Buffer IC on YDT or YDB Board
st
– Replace the YDT or YDB
FWD50PX2 Troubleshooting
YDT
Brd
Ysus
YDB
Brd
XL address Board XR address Board
Zsus
49