Service manual

12
LC-20B8U-S
LC-20B9U-S
LC-20B9U-SM
Step Part No. Description
1 QCNW-C458WJQZ Extension Cable 80-pin Main (SC1201)-LCD Panel (CN1)
2 QCNW-D402WJQZ Extension Cable 23-pin Main (SC2001)-Sub (P3401)
3 QCNW-C461WJQZ Extension Cable 15-pin Main (SC2003)-Power (P7703)
4 QCNW-D402WJQZ Extension Cable 23-pin Main (SC2004)-Power (P7702)
6, 8 QCNW-C460WJQZ Extension Cable 19-pin Power (SC7701)-Inverter (P6701)
»Precautions in servicing the side-B (backside) of the main PWB unit
1. Disconnect the FFC for connection between the main PWB (SC1201) and LCD panel (CN1), and then connect the
service-specific extension FFC (flat cable) (QCNW-C458WJQZ).
2. Disconnect the SC2001 side of the lead from between the main PWB (SC2001) and the sub PWB (P3401), and
then connect the service-specific extension cord (QCNW-D402WJQZ).
3. Disconnect the SC2003 side of the lead from between the main PWB (SC2003) and the power PWB (P7703), and
then connect the service-specific extension extension cord (QCNW-C461WJQZ).
4. Disconnect the SC2004 side of the lead from between the main PWB (SC2004) and the power PWB (P7702), and
then connect the service-specific extension cord (QCNW-D402WJQZ).
5. Remove the lock screws (4pcs.) from the main PWB, detach the PWB from the chassis frame, and then turn it
over to service.
»Precautions in servicing the Chip Parts side (backside) of the inverter PWB unit
6. Disconnect the SC7701 side of the lead from between the power PWB (SC7701) and the inverter PWB (P6701),
and then connect the service-specific extension cord (QCNW-C460WJQZ).
7. Remove the lock screws from the inverter PWB and then turn it over to service.
»Precautions in servicing the Chip Parts side (backside) of the power PWB unit (main/sub PWB)
8. Disconnect the SC7701 side of the lead from between the power PWB (SC7701) and the inverter PWB (P6701),
and then connect the service-specific extension cord (QCNW-C460WJQZ).
9. Remove the PWB fixing screws (main unit: 4 pcs., sub unit: 4 pcs., power unit: 6 pcs.)
P6701 SC7701
P7702
SC2004
SC1201
CN1
SC2003
SC2001
P3401P7703
Main PWB
(Side-B)
Power PWB
(Backside)
Sub PWB
8
6
7
3
1
5
4
9
2
Inverter PWB
(Backside)
Power PWB Sub PWB
Main PWB
Inverter PWB