Samsung HPT5054X/XAA Service Manual page 37

Troubleshooting
$ 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.
[ Logic Main ]
( action of Vsync )
YES
Replace the Board
[ Y-MAIN ]
Check several points
F5001 for VDD
F5002 for Vs
FUSE
F5004 for VCC
F5005 for OUT_L
OK
Q5009~Q5021 FET
OK
Y-MAIN
Normal State
4-10
[ Logic Main ]
Observation of
Check necessary points
abnormal display
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 Panel
[ X-MAIN ]
Check several points
F4001 for VCC
F4002 for Vs
F4004 for VDD
F4005 for Ve
Q4002~Q4003
Q4011~Q4016
X-MAIN
Normal State
[ X-MAIN ]
OPEN
FUSE Replace the Board
OK
SHORT
FET Replace the Board
OK
Samsung Electronics