Cd Part Troubles; Cd Reading Check - LG SB74 Service Manual

14. CD PART
Turn on CD
YES
Check Open/Close
YES
Check "READING" display
YES
Check Reading OK
YES
Playing, check audio output
YES
OK

15. CD READING CHECK

Check Connector locking
CN703, CN723
YES
Does sled motor move?
YES
Does the laser move?
YES
Does laser light?
YES
Does the spindle motor
rotate?
YES
Is reading ok?
NO
Check R730,R731
NO
Check CN703
NO
Check CN703
Check pickup movement
Check U704 BA5927FM
Check U703
NO
Check U703 pin55, 57
NO
Check CN723 pin6, 7
(SL+,SL-)
YES
NO
Check CN703 pin1, 2
(F+,F-)
YES
NO
Check CN703 pin19
(LD)
YES
NO
Check CN723 pin8, 9
(SP+, SP-)
YES
NO Check CN703 pin3, 4
(T+, T-)
3-7
NO
pin34(Open 3.3V Close 0V)
YES
YES
YES
NO
NO
NO
NO
NO
Check JK500/JK501
Defective pickup or
U703, U704
Defective pickup or
U703, U704
Defective pickup or Q701
Defective pickup or
U703, U704
Defective pickup or
U703, U704