While Philips moves forward with their high-definition television products, many of their older standard-definition televisions are still in use. Changing to an input channel on these televisions can be difficult without a remote, but isn't impossible in most cases; it will primarily depend on whether there are physical buttons present on the television.
Most SDTVs feature physical buttons somewhere, generally on the bottom of the front panel or on the side of the case. While not all models are the same, some do feature a dedicated "Input" button that can be used to immediately change the television to an input channel. If the television features multiple input channels, each press of the button will switch to a different input channel.
If your television doesn't feature a dedicated "Input" button, you may still be able to use the channel buttons to reach an input channel. Just press the "Channel Down" or "Channel -" button until you reach the input channels. You should be able to reach your desired input channel by continuing to press the "Channel Down" button.
Cable or Satellite Box
If you have a cable or satellite television box connected to your television, you may be able to control your television with the remote for that device. This will depend on the device itself and the compatibility of its remote with your television -- not all TVs will properly interact with a cable or satellite remote. If it works, then you can use the remote's input buttons or the "Channel Up" and "Channel Down" buttons to select the input channel.
These tips may not work for every television -- not all Philips SDTVs feature an input button, and not every Philips television can reach the input channels using the "Channel" buttons. If these tips don't work for your television, you'll likely need to locate your remote or procure a compatible universal remote.