Sony PFM42V1 Triage & Troubleshooting Manual page 32

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
XL address Board XR address Board
XL address Board XR address Board
&
&
XL address Board XR address Board
Single Horizontal Black Line (upper half of screen )
st
1 – Confirm secure
connections between YDT
and Panel Assembly .
Zsus
Scan
Board
Replace Panel Assembly if
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 Panel Assembly if Replace YDB board if ICs are
flex cable is damaged 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
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 board .
FWD42PV1 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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