Philips DVP3800 Service Manual page 21

Only DVD disc or only disc except DVD can be played
Only DVD disc, or only disc
except DVD can be Played.
Go
Check the
connection between
24pin and the loader.
Yes
Check whether there is laser
voltage (1.9V for CD and 2.4V for
DVD) on L101(R35)
L102(R32).
Yes
Whether voltage on pin14/pin15 of U1
varies between 2.4V and 3.3V (PIN14
=2.4V and PIN15=3.3V
PIN14=3.3V and PIN15=2.4V for DVD)
Yes
Check whether pins of U1 and
peripheral components
badly soldered, defected
Yes
Check Q103, Q104
whether in
condition
Yes
Change U1 or the loader.
FFC
No
No
and
No
for CD;
are
No
good
4-5
Check the loaded circuit
Check the solder status on U1 and
peripheral components
check if bad solder exist on U1 and
peripheral components
No
Replace the bad spare parts
Correct connection
Trouble shooting chart