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Troubleshooting
Samsung Electronics
4-9
No Display
[ Y-MAIN ]
Check necessary points
[ Logic Main ]
LED Blinks
[ X-MAIN ]
Check necessary points
[ Logic Main ]
Check if power is supplied
( 5V, 3.3V )
Check the LED
operation
Check if internal is
Default Black
Check the
MICOM operation
Check the
power connectivity
Check if any address
data output is detected
Check the ASIC
Control Signal output
Check if the data
and control signals
between DDR & ASIC
are normal
If the input voltage is
abnormal, replace the
PSU and check it
again as this indicates
a PSU output error
Check the FUSE
Check the
input voltage
YES
NO
YES
NO
[ Y-MAIN ]
Check several points
FUSE
FET/
DIODE
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, D5105
D5104, D5103,
Q5101, D5101,
Q5100
[ X-MAIN ]
Check several points
FUSE
FET/
DIODE
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, D4014,
D4013, Q4003
Q4101, Q4001,
D4018, Q4007,
Q4006, Q4005
D4011, D4004
2) Troubleshooting Procedure in Abnormal Conditions
①
No Display
▶
No 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.
Содержание PN42A450P1D
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