LG DV7511E6S, Service Manual

Page: 21 / 57

3-12
FE signal becomes like the waveform 2, in case of DVD dual layer disc since the laser
beam is reflected on both layer 0 and layer 1.
Layer0 Layer1
A
21. FACT and FE for DVD9 (Dual disc)
L508
IC506
Buffer IC
IC501
C542
C541
R500
The waveform and the block diagram as below show a clock input and output between IC501 and X501.
Clocks generated in X501 is output and input into pin120 of IC501.
The clock frequency is 27MHz.
If this clock is abnormal or does not appear, replace the X-tal or MPEG IC
IC501
pin120
A diagram for a colck input of IC501 MPEG CLOCK
22. System clock of MPEG IC