Samsung PS42E7SX Service Manual page 99

Troubleshooting
② Abnormal Display(Abnormal Image is on Screen.(except abnormality in Sustain or Address)
▶ Abnormal Display is related with Y-MAIN, X-MAIN, Logic Main and so on.
This page shows you how to check the boards, and the following pages show you how to find the defective board.
( action of Vsync )
YES
Replace the Board
[ Y-MAIN ]
Check several points
F5001 for VDD
FUSE
F5002 for Vs
OK
Q5008
Q5009
FET
Q5010
Q5013
OK
Y-MAIN
Normal State
6-10
[ Logic Main ]
Observation of
Check necessary points
abnormal display
[ Logic Main ]
LED Blinks
Regular NO
abnormal
pattern
OPEN
Replace the Board
SHORT
Replace the Board
Abnormal
Display
[ Y-MAIN ]
Check necessary points
Logic Main
Normal State
Replace the PDP
[ X-MAIN ]
Check several points
F4000 for VCC
F4003 for Vs
Q4010
Q4011
Q4012
Q4015
Normal State
[ X-MAIN ]
OPEN
FUSE Replace the Board
OK
SHORT
FET Replace the Board
OK
X-MAIN
Samsung Electronics