Philips DVP3855, DVP3879, DVP3893, DVP3896, DVP3898, DVP3800 service manual Disc cannot be read

4-4 Trouble shooting chart

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

Re-solder or replace the defective parts

Check U1 and peripheral components

Correct connection