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Disc cannot be read .
Disc cannot be read.
Check the FFC connection
between 24P and the loader.
Check
laser voltage (2.3V for DVD
and
Collector of Q2 &Q3
Check
peripheral components are
eroded or badly soldered.
Check if there is RFO signal
on
pin10
normal RFO signal is a clear
reticulated wave)
Check the connection
between U1 and loader
Replace U1 or loader.
Yes
Yes
whether there is
1.9V
for
CD)
on
Yes
U1,
U7,
and
Yes
of
CN2.
(The
Yes
Yes
1-4
No
Check the loaded circuit
1.Check voltage on pin 100 of U1
varies between 0 and 3.3V:
No
3.3V for CD
0V for DVD
2.Check
components are eroded or defect
No
Re-solder or replace the defective parts
No
Check U1 and peripheral components
No
Correct connection
Trouble shooting chart
whether
peripheral