Philips DVP3880K/55 Service Manual page 25

Remote reception is insensitive or fails.
Remote reception is
insensitive or fails.
Check if the remote
control works properly.
Yes
Check if the power supply
voltage to the remote censor
is normal
Yes
Use an oscilloscope to check if there is
output waveform from the first pin IR of the
remote censor after pressing button on the
remote control.
Yes
Check if there is IR
signal on pin 33 of U20
No
Correct connection
Go
4-9
No
Check battery
No
Check R315、C315
No
REM301(PIN1 - RC waveform)
Yes
Change U20
IR waveform
Trouble shooting chart