Philips DVP3120 Series Service Manual page 24

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)
Collector of Q7 &Q8
Yes
Check U1, U2, and
peripheral components are
eroded or badly soldered.
Yes
Check if there is RFO signal
on pin17 of CN3. (The
normal RFO signal is a clear
reticulated wave)
Yes
Check the connection
between U1
Yes
Replace U1 or loader.
4-14
No
No
on
No
No
No
T rouble shooting chart
Remark: Trouble shooting chart for
DVP3120/05/12
Check the loaded circuit
1.Check voltage on pin 44 of U1
varies between 0 and 3.3V:
3.3V for CD
0V for DVD
2.Check whether
components are eroded or defect
Re-solder or replace the defective parts
Check U1 and peripheral components
Correct connection
peripheral