Disc cannot be read.
Disc cannot be read.
Check the FFC connection
between 45P and the loader.
Check whether there is laser
voltage (2.3V for DVD and 1.9V
for CD& 8V for BD) on Collector of
Q4504,Q4506 and Q4502.
Check IC4001, IC4402, and
peripheral components are
eroded or badly soldered.
Check if there is RF± signal on
pin22,23 of CN4501. (The normal RF±
signal is a clear reticulated wave)
Check the connection
between IC4001.
Replace IC4001 or loader or replace Main PCB.
Yes
Yes
Yes
Yes
Yes
Yes
11-6
No
Check the loaded circuit.
1.Check voltage on pin C11,C10,B10 of
IC4001 varies between 0 and 3.3V :
3.3V for CD
No
0V for DVD
8V for BD
2.Check whether peripheral components
are eroded or defect. If not, replace
Main PCB.
No
Re-sloder or replace the defective parts
or replace Main PCB.
No
Check IC4402 and peripheral
components or replace Main PCB.
No
Correct connection.
Trouble shooting chart