Tuner Troubleshooting - LG LST-3410A Service Manual

8. TUNER TROUBLESHOOTING

Tuner
problem
No
TU100(9-pin)
+30V Input OK
Yes
No
TU100(1,8,12-pin)
+5V Input OK
Yes
No
TU100(23-pin)
+3.3V Input OK
Yes
No
TU100(21-pin)
+1.8V Input OK
Yes
No
IC151(6,7-pin)
I2C Bus OK
Yes
No
IC148(MiCOM)
Check OK
Yes
No
Check
Gemster Board
Yes
Tuner part OK
J114 Connector
Power Cable
Check
TU100(Tuner )
Voltage check
No
IC137(3-pin)
+1.8V output OK
Yes
No
IC151(8-pin)
+5 input OK
Yes
No
IC111(5-pin
+5 input OK
Yes
IC111(1-pin)
No
12MHz input clock
OK
Yes
No
IC113(20-pin)
+5 input OK
Yes
Check IC148
Check Gemstar Board
No
IC137(1-pin)
+3.3V input OK
Yes
J114 Connector
Power Cable
Check
Chang IC151
Check U101
12MHz Clock out
Check IC113
System Part
Check
3-37
Change IC137