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Disc cannot be read .
Disc cannot be read.
Check the FFC connection
between 24P and the loader.
Check whether there is laser
voltage (2V for VCD and 2.2V for
DVD) on Collector of
CheckU1,U2,and peripheral
components are eroded or
badly soldered.
Yes
Check if there is RFO signal on
pin8 of XP5. (The normal RFO
signal is a clear reticulated wave)
Check the connection
between U1
Replace U1 or loader.
Yes
Yes
Q13 Q14.
Yes
Yes
Yes
3-4
No
Check the loaded circuit
1.Check voltage on pin 54 of U1 varies
between 0 and 3.3V:
No
3.3V for VCD
0V for DVD
2.Check whether peripheral 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
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