SAMSUNG S2450TH, S2400 Troubleshooting
Samsung Electronics 9-1
9. Troubleshooting
9-1 Amplifier
9-1-1 Power Malfunction
FRONT PCB µ-com VDD(5V)
normal?
UIC1 pins 18,46,72,90
Yes
FRONT PCB
Does UX2(6MHz)
oscillate ?
Yes
Check the UIC1 :
pin 51 Vp (-23.5V)
Replace µ-com
Yes
No
FRONT PCB P/OFF-SENSE
voltage normal ?
(pin 92 ; 5.0V)
Check the Main PCB :MCON5
FCW1-WIRE/AD18,AZD3
No
FRONT PCB UIC2(78L05)
OUT: (5V) output
voltage normal
No
No
No
Check the Main PCB
AZD4,6/AZD5 : 25V
normal ?
Replace AZD4,5,6
No
Replace µ-com
Yes
Check the connector
FRONT /MAIN PCB(FCW1/FCW2)
Yes
Replace µ-com
Yes
Check the AQ2(D882) ?
No
Replace AQ2(TR:D882)
Yes
Check the Fuse
9-2 Samsung Electronics
9-1-2 FLT Malfunction
Connector inserted
correctly?
No
Check voltage : AC 2.6V
at FRONT-PCB FLT?
No
Check Main-PCB Front PCB
connection and the voltage of
FCW2, pins2,3(AC 2.6V)
Check voltage at UIC1
pin 51(-25V)
No
Check the voltage of AZD4,6(-25V)
Replace UIC1(LC866XXX)
Yes
Yes
Yes
Reinsert the connector
Troubleshooting
Samsung Electronics 9-3
9-1-3 No Output
No
Check the AQ7,8,12
Base B+ ?
Is mute selected ?
Yes
Check if the output line is
short.
Check the JIC1(TDA7440D)
B+ of Function-IC
No
Check the MCON5/CABLE-WIRE
Replace JIC1(TDA7440D)
No
Main PCB AIC1(TA8270K)
pins 3,12 B+(15~16V)
No
Check the Fuse
Check the Power-Trans
Yes
No
Replace Fuse
FRONT PCB µ-com pins 2
Check the "H"
Yes
Check the AQ1,3,4
Replace µ-com
Yes
Restore sound with remocon
No
Check for TR short
Replace it.
Yes
Yes
Troubleshooting
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