LG GCC-4241N Service Manual page 45

Focus Servo is unstable
Focus Error Check.
LD Check
OK
After Power On, does Pick
up move
OK
Is Pick Up
Signal normal?
PG101(22, 23, 25~30)
NG
1) Check Soldering of PG101.
2) Check voltage of TL331(5V).
3) Check voltage of TL327(2.2V).
4) Check insertion or damage of Main
FPC.
OK
Replace Unit Mecha and Execute LD
Calibration.
Focus Drive Check.
Is Focus Drvie normal?
TL316.
OK
Is Focus Drive normal?
IC201 (178)
NG
Replace IC201.
NG
Go to "LD Control is abnormal".
NG
Go to Focus Drive check.
OK
Check Dumping Reg.
RA102, RA103.
1)Check Soldering of PG101.
NG
2) Check voltage of TL311(5V).
3) Check voltage of TL313(Vhalf).
4) Check insertion or damage of
Main FPC.
OK
Check LPF (R250, C250).
OK
1)Check Soldering of IC101.
2) Check voltage of 5V.
3) Check voltage of Vhalf.
Replace IC101.
OK
Replace Unit Mecha and
Execute LD Calibration.
OK
47