Philips DVP1120 Service Manual page 19

Remote reception is insensitive or fails.
Remote reception is
insensitive or fails.
Check if the remote
control works properly.
Check if the power supply
voltage to the remote censor
is normal
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.
Check if there is IR
signal on pin 134 of U1
Correct connection
Go
Yes
Yes
Yes
No
4-8
No
Check battery
No
Check R201 R202 R93
C201 C14
No
REM1(PIN1 - RC waveform)
Yes
Change U1
IR waveform
Trouble shooting chart