Philips DVP3111 Service Manual page 15

Remote reception is insensitive or fails.
Remote reception is
insensitive or fails.
Go
Check if the remote
control works properly.
Yes
Check
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 44 of
U2
No
Correct connection
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if the power
5-7
No
Check battery
No
Check R1 R2 on front board
No
IR1(PIN 3 - RCwaveform)
Yes
Change U2
IR waveform
Trouble shooting chart