Sony PFM42V1 Triage & Troubleshooting Manual page 23

YDT
Board
&
Drive
ICs
Ysus
Scan
Board
YDB
Board
&
Drive
ICs
YDT
Board
&
Drive
ICs
Ysus
Scan
Board
YDB
Board
&
Drive
ICs
YDT
Board
&
Drive
ICs
Ysus
Scan
Board
YDB
Board
&
Drive
ICs
PDP-04
XLT address Board XRT address Board
XLB address Board XRB address Board
XLT address Board XRT address Board
XLB address Board XRB address Board
XLT address Board XRT address Board
XLB address Board XRB address Board
Single Horizontal Black Line (upper half of screen )
st
1 – Confirm secure
connections between YDT
and Panel Assembly .
Zsus
Scan
Replace Panel Assembly if
Board
flex cable is damaged
Single Horizontal Black Line (lower half of screen )
st
1 – Confirm secure 2
connections between YDB the YDB board for physical
and Panel Assembly damage .
Zsus
Scan
Board Replace YDB board if ICs are
damaged .
Less-Than ½ Screen Horizontal Black Bar
st
1 – Replace the YDT or YDB
board depending on where the
Zsus
horizontal black bar is located on
Scan
Board
the screen .
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 board .
PFM42X1 Troubleshooting
nd
2 – Check the drive ICs on
the YDT board for physical
damge .
Replace YDT board if Ics are
damaged .
nd
– Check the drive ICs on
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