Checkpoints By Error Mode - Samsung PE8500 Series Service Manual

4.1.1. Checkpoints by Error Mode

■ No Power
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•
Symptom
•
The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if
the cables are improperly connected or the Main Board or SMPS is not functioning. In this case,
check the following :
•
Major Checklist
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•
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Diagnostics
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The LEDs on the front panel do not work when connecting the power cord.
The SMPS relay does not work when connecting the power cord.
The unit appears to be dead.
Check the internal cable connection status inside the unit.
Check the fuses of each part.
Check the output voltages of the SMPS.
Replace the Main Board.
P owe r indica tor LED is on?
Ye s
Are the S MP S CN801 a nd Ma in
CN201_LO conne cte d?
Ye s
Is th e Fus e (F801S ) of the S MP S P owe r
Input P a rt blown?
Ye s
S MP S CN801
P IN2 : S TB 5V
PIN1_P S ON : Che ck to s e e if it is 0V
Ye s
Re pla ce the Ma in Boa rd.
CN801
CN201_LO
No
Che ck a conne ction powe r code .
No
Conne ct the ca ble be twe e n
CN801 a nd CN201_LO conne ctor.
No
Re pla ce Fus e . (F801S )
No
Re pla ce the S MP S .
4. Troubleshooting
4-2