Philips DVP3126 Service Manual page 19

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 134 of U1
No
Correct connection
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if the power
4-9
No
Check battery
No
Check R315 C315
No
REM301(PIN1 - RC waveform)
Yes
Change U1
IR waveform
Trouble shooting chart