Troubleshooting - Samsung SCM-7270 Service Manual

6. Troubleshooting

6-1 Amplifier
6-1-1 Power Malfunction
LCD lamp is ON
Pins 73,31 of
UIC1(LC72362)
is at 5V
Voltages at
RQ702,RQ703
are normal
Voltage at
RQ701 is normal
Samsung Electronics
Yes
Yes
Yes
No
Power Transistor &
fuse normal
No
are soldering
of SCON1-FCW2
No
Voltages at RQ1, RQ2 and
RFR1 are normal
No
Replace RQ701
Connection
are normal
Check Voltage at
RIC1
Yes
6-1