Philips DVP3120 Series Service Manual page 14

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 VCD
and 2.3V for DVD) on
Collector of Q7 &Q8
Yes
Check
peripheral components are
eroded or badly soldered.
Yes
Check if there is RFO signal
on pin17
normal RFO signal is a clear
reticulated wave)
Yes
Check the connection
between U1
Replace U1 or loader.
U1, U2, and
of CN3. (The
Yes
4-4
Remark: Trouble shooting chart for
DVP3120/51/55/94/75, DVP3120K/55/93/98
No
Check the loaded circuit
1.Check voltage on pin 44 of U1
varies between 0 and 3.3V:
No
3.3V for VCD
0V for DVD
2.Check whether
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
peripheral