Trouble shooting chart | |
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Disc cannot be read.
Disc cannot be read.
Yes 
Check the FFC connection
between 24P and the loader.
Yes 
Check whether there is laser voltage (1.9V for CD and 2.4V for DVD) on L101(R35) and L102(R32)
Yes
Check U1, U10, and peripheral components are eroded or badly soldered.
Yes
Check if there is RFO signal on pin17 of XP2. (The normal RFO signal is a clear reticulated wave)
Yes
Check the connection between U1
Yes
Replace U1 or loader.
No
No
No
No
No
Check the loaded circuit
1.Whether voltage on pin14/pin15 of U1 varies between 2.4V and 3.3V (PIN14=2.4V and PIN15=3.3V for CD;PIN14=3.3V and PIN15=2.4V for DVD),
2.Check whether peripheral components are eroded or defect
Check U1 and peripheral components
Correct connection
