SAMSUNG Mm-16 Troubleshooting
6. Troubleshooting
6-1 Main
6-1-1 Power Malfunction
Samsung Electronics 6-1
Yes
No
Yes
No
Yes
No
No
Yes
LCD lamp is ON
Power Transistor
(RQ705) & fuse normal
Pins 73,31 of
UIC1(LC72362)
is at 5V
Connection
and soldering
of SCON1-UCON1
are normal
Check Voltage at RIC1
Replace RQ702,RQ703
Replace RQ701
Voltages at
RQ702,RQ703
are normal
Voltage at
RQ701 is normal
6-2 Samsung Electronics
Troubleshooting
Yes
No
Yes
No
No
6-1-2 FM No Sound
6-1-3 AM No Sound
Voltages at
IIC1(LA1851N) and semi
conductors tuner section
are normal
Voltage at power supply
section
Check pump charge circuitry(OQ5)
connection or soldering of SCON1UCON1,FCON1 soldering of pin 77 of
LC72362
TCON1 is at
1.5V¡ 0.5 on low coverage
7.5V ¡ 0.5 on high
coverage
Replace FET
Voltage at FET are
normal
Yes
No
No
Check pump charge circuitry
(OQ5) connection of SCON1,
UCON1 soldering of pin77
of LC72362N
Yes
Voltage
at LA1851N(IIC1) and tuner
semi conductors are normal
(Refer to Schematic Diagram)
Voltage between
TCON1: AM(MW)
Low coverage 0.9V 0.1
High coverage 9V 0.5
LW Low coverage 0.7V 0.1
High coverage
4.5V 0.5
Check loop antenna soldering and
connection of OL1, OL2, OT1,OT2, IT2
Check voltage at power
supply section
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