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Troubleshooting
6-1-2 FM No Sound
Voltages at
IIC1(LA1851N) and semi
conductors tuner section
are normal
Yes
TCON1 is at
1.5V¡ 0.5 on low coverage
7.5V ¡ 0.5 on high
coverage
Yes
Voltage at FET are
normal
6-1-3 AM No Sound
at LA1851N(IIC1) and tuner
semi conductors are normal
(Refer to Schematic Diagram)
Voltage between
TCON1: AM(MW)
Low coverage 0.9V
High coverage
LW Low coverage 0.7V
High coverage
Check loop antenna soldering and
connection of OL1, OL2, OT1,OT2, IT2
6-2
Voltage
Yes
0.1
9V
0.5
0.1
4.5V
0.5
Yes
No
Voltage at power supply
section
Check pump charge circuitry(OQ5)
No
connection or soldering of SCON1-
UCON1,FCON1 soldering of pin 77 of
LC72362
No
Replace FET
No
No
Check voltage at power
supply section
Check pump charge circuitry
(OQ5) connection of SCON1,
UCON1 soldering of pin77
of LC72362N
Samsung Electronics
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