Samsung PN42A450 - Page 33

Troubleshooting
4-10 Samsung Electronics
Abnormal
Display
[ Y-MAIN ]
Check necessary points
[ Logic Main ]
Observation of
abnormal display
[ X-MAIN ]
Check necessary points
[ Logic Main ]
LED Blinks
( action of Vsync )
Regular
abnormal
pattern
Replace the Board
NO
YES
Logic Main
Normal State
Replace Panel
[ Y-MAIN ]
Check several points
FUSE
FET
Y-MAIN
Normal State
Replace the Board
Replace the Board
OK
OPEN
SHORT
OK
F5000 for VDD
F5801 for Vs
F5800 for VCC
Q5500, Q5200,
Q5201, Q5202,
Q5203, Q5400,
Q5401, Q5402,
Q5300, Q5101,
Q5100
[ X-MAIN ]
Check several points
FUSE
FET
X-MAIN
Normal State
Replace the Board
Replace the Board
OK
OPEN
SHORT
OK
F4001 for VCC
F4003 for Vs
F4005 for VDD
F4004 for Ve
Q4002, Q4202,
Q4004, Q4003
Q4101, Q4001,
Q4007, Q4006,
Q4005
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.