Philips DVP3320/55 service manual Disc cannot be read

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 (2.3V for DVD and 1.9V for CD) on Collector of Q4 &Q5

Yes

Check U2, U4, and peripheral components are eroded or badly soldered.

Yes

Check if there is RFO signal on pin10 of XP7. (The normal RFO signal is a clear reticulated wave)

Yes

Check the connection between U2

Yes

No

No

No

No

No

Check the loaded circuit

1.Check voltage on pin 97 of U2 varies between 0 and 3.3V:

Æ3.3V for CD Æ0V for DVD

2.Check whether peripheral components are eroded or defect

Re-solder or replace the defective parts

Check U1 and peripheral components

Correct connection