Sharp LC-20B5M Service Manual page 12

LC-20B5M
» Precautions in servicing the B side (backside) of the main PWB unit
1. Disconnect the FFC (flat cable) from between the main PWB (SC1204) and the liquid crystal panel, and then
connect the service-specific extension FFC (flat cable) (QCNW-A556WJZZ).
2. Disconnect the FFC (flat cable) from between the main PWB (SC1201) and the liquid crystal panel, and then
connect the service-specific extension FFC (flat cable) (QCNW-A555WJZZ).
3. Disconnect only the SC1202 of the FFC (flat cable) from between the main PWB (SC1202) and the liquid crystal
panel, and then connect the service-specific extension FFC (flat cable) (QCNW-B784WJZZ).
4. Disconnect the P701 side of the lead from between the main PWB (P701) and the analog PWB, and then
connect the service-specific extension cord (QCNW-C086WJQZ).
5. Disconnect the FFC from between the main PWB (SC2001) and the analog PWB (SC3403), and then connect
the service-specific extension FFC (flat cable) (QCNW-A556WJZZ).
6. Disconnect the lead from between the main PWB (P2006) and the analog PWB (P1601), and then connect the
service-specific extension cord (QCNW-C498WJQZ).
7. Remove the lock screws from the main PWB, detach the PWB from the chassis frame, and then turn it over to
service.
» Precautions in servicing the inverter PWB unit (backside)
8. Disconnect only the P3703 side of the lead from between the inverter PWB (P6706) and the analog PWB
(P3703), and then connect the service-specific extension cord (QCNW-C086WJQZ).
9. Remove the lock screws from the inverter PWB, detach the PWB (be careful not to get close to the high-tension
area and its surrounding conductive parts), and then turn it over to service.
Main PWB
Step
1 QCNW-A556WJZZ
2 QCNW-A555WJZZ
3 QCNW-B784WJZZ
4 QCNW-C086WJQZ
5 QCNW-A556WJZZ
6 QCNW-C498WJQZ
8 QCNW-C086WJQZ
Main PWB
7
(Side-B)
CN2 CN3
3
SC1202
5 4
SC1204
6
SC1201
1
P2006 SC2001 P701
2
P1601 SC3403
Analog PWB
Part No.
Extension Cable 50-pin Main (SC2004)-LCD panel
Extension Cable 20-pin Main (SC1201)-LCD Panel
Extension Cable 30-pin Main (SC1202)-LCD Panel
Extension Cable 10-pin Main (P701)-Analog (P3201)
Extension Cable 50-pin Main (SC2001)-Analog (SC3403)
Extension Cable 15-pin Main (P2006)-Analog (P1601)
Extension Cable 10-pin Main (P6706)-Analog (P3703)
Inverter PWB
P3201
P3703
P6706
8
Description
12
Inverter
PWB
(Side-B)
9