Philips HTD5540/12 Service Manual page 22

Remote control does not work
Remote
does not work
Check whether the remote
controller's
exhausted or not.
In the front control board,check
IR601 pin1 Waveform
In the main board U20
pin 16 waveform
YES
Replace main board
control
Go
battery is
NO
Yes
5 - 3
Replace the battery for remote controller
Yes
NO
NO
Check the pcb layout
Trouble shooting chart
Replace IR601