Samsung PPM63M7FS Service Manual page 27

Troubleshooting
2) Troubleshooting Procedure in Abnormal Conditions
① No Display (Operating Voltage exist, but an doesn't exist on Screen)
► 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.
[ Y-MAIN ]
Check several points
F5001 for VDD
F5002 for Vs
F5004 for VCC
F5005 for OUT_L
Q5009~Q5021
D5005, D5007
D5008
Normal State
4-6
[ Logic Main ]
LED Blinks Check necessary points
YES
Check the LED
operation
YES
Check if internal is
Default Black MICOM operation
Check if any address
data output is detected Control Signal output
and control signals
between DDR & ASIC
OPEN
FUSE Replace the Board
OK
SHORT
FET/
Replace the Board
DIODE
OK
Y-MAIN
No Display
[ Y-MAIN ] [ X-MAIN ]
Check necessary points
[ Logic Main ]
Check if power is supplied
( 5V, 3.3V )
NO
Check the
power connectivity
NO
Check the FUSE
Check the
Check the
Check the ASIC input voltage
If the input voltage is
abnormal, replace the
Check if the data
PSU and check it
again as this indicates
are normal a PSU output error
[ X-MAIN ]
Check several points
F4001 for VCC
F4002 for Vs
FUSE
F4004 for VDD
F4005 for Ve
Q4002~Q4003
Q4011~Q4016 FET/
D4004 DIODE
D4006~D4008
X-MAIN
Normal State
OPEN
Replace the Board
OK
SHORT
Replace the Board
OK
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