LG GSA-4120B Service Manual page 75

Detail Error Code & Fail Analysis
1. Laser Power Initial Adjust
No. Error Code
SSB Byte8,9
1 28xx
(Exchange
low/high byte)
Byte8: xxh
Byte9: 28h
2 48xx
3 5Exx
4 4C0x to 4C4x
5 4C5x to 4C7x
6 4C80
7 4CAx
Contents of fail
LP Adjust NG.
High Frequency Adjust NG.
NRZi Skew Adjust NG.
Data Slice Adjust NG.
EQ Boost Adjust NG.
RAW Slice Level Adjust NG.
EQ Auto Frequency Adjust NG. 1) Check solder of IC101circumference.
Fail Analysis
1) Check Pickup FFC Connection.
2) Check solder of IC101circumference.
(pin#10, 14, 16, L150, L151)
3) Check solder of IC201.
4) Exchange Pickup(LDD, Front Monitor).
5) Exchange IC101(AFE).
6) Exchange IC301(MPU & DSP).
1) Check Pickup FFC Connection.
2) Exchange Pickup (LDD part).
3) Exchange IC301(DSP).
1) Check Pickup FFC Connection
2) Exchange Pickup (LDD part).
3) Exchange IC301(DSP).
1) Check solder of IC101circumference.
(pin# 76, IC103, L150, L151)
2) Exchange IC101(AFE).
3) Exchange IC301(DSP).
1) Check solder of IC101circumference.
(pin# 76, IC103, L150, L151)
2) Exchange IC101(AFE).
3) Exchange IC301(DSP).
1) Check solder of IC101circumference.
(pin# 76, IC103, L150, L151)
2) Exchange IC101(AFE).
3) Exchange IC301(DSP).
(pin# 76, IC103, L150, L151)
2) Exchange IC101(AFE).
3) Exchange IC301(DSP).
Block Diagram
No.01
No.02
No.02
No.03
78