Speaker powers on and gets a signal. but no sound comes out.. you can hear a connection when inserting or pulling out the cable though

If the hum is a low note continuous hum, its at 'mains' frequency. The power cables to the unit (or inside it) are getting too close to the cables that carry sound signals to the center speaker. The mains power naturally hums and if mains wires are near to audio kit wires they pick up this sound and play it through their system/speakers. Check the wires to and from it make sure the connections are good and firm. Seperate these wires by at least one inch from any power cables, use tape to hold them down and away from each other.

According to the schematic, once the signal is initially amplified (also where the LED shows signal), the audio is sent to the send/return jacks (shown on pg3-C7). A quick test to see if audio exists at the insert point will require an insert cable. An insert cable can be a balanced 1/4" cable which splits out to two mono 1/4" connectors or a pair of RCA's. Connect one of the insert outputs to a console (if 1/4" cable) or a tape loop on a home stereo receiver (if send cable splits out to RCA's) and see if you've got sound when playing your guitar (with LED on the Marshall showing signal). If no sound, go to (A) below. If you have sound, go to (B) below.
(A) Ten pin connector labelled CON2 (shown on pg5-B1). Make sure connector is tightly seated and that the pins on the jack and the female connectors in the plug are clean and that good contact is being made.
(B) Twelve pin connector labelled CON1 (shown on pg5-B4). This is the DFX board - make sure this is tight and well seated.

According to the schematic there are voltages seen at several of the connection points previously mentioned. If you have a multimeter and are qualified and careful - check to make sure the voltages are present as shown.

If you're not qualified - meaning you have little or no experience - STOP and refer this repair to a qualified bench tech. They get paid to keep the magic smoke inside the amplifier. You may end up damaging things worse or even beyond repair or even damaging yourself.

Where you plug in the speakers depends on many things like where is the source of the sound coming from? Is it a cable box? Do you want just the sound from the tv itself to come to your speakers? If you want the sound of the cable then you need to connect them to the out going leads on the back of the cable box.

The tv probably has a small button some where on the back to use external speakers. If your running the cable signal into the tv, turn on the external speaker option and then use the out going leads to send the signal to your speakers. There may also be a signal input/output choice in your tv settings. click on the different choices of in put to see if you hear through the speakers to figure out which one is for them. The choices are usually listed as AUX, Antenna 1, Antenna 2, ect.

Try connecting any other speaker system, as per me your speakers are facing hardware issue or the cable might be damaged

Please check the below mentioned things :
Verify the AC power cord is plugged into the wall outlet. Turn the VOLUME knob on the right speaker until you hear a click sound. An LED will light next to the knob when the power is ON. Turn the VOLUME knob clockwise to raise the volume. Check volume level on the computer sound card or alternate audio source device, and set at mid-level. Check plug connections on the audio source. Make sure the signal cables are inserted firmly into the correct jacks. Make sure the 3.5mm stereo cable is connected and fully inserted into the "line-out," "audio-out," or the headphone jack of the audio source. Test the speakers on another audio device. Remove the 3.5mm stereo cable from the audio source device and connect it to "line-out," "audio-out," or the headphone jack of another audio source.
And if in in case u r unable to get it working ..
Replace the speakers ..

I know nothing about your model but the very first thing that I would do is to pull the power cord from the wall outlet for at least 10 minutes and then plug it back in. This may reset everything.

Dude, the hdmi is just for the video signal, you'll have to use a separate audio cable to get sound from the integrated speakers.

Without doubt the Philips had an amp built in for the subwoofer. So that when it is connected to the TV the sound signal from the TV is just too weak to power it.
My advice would be if you can't get a another receiver is to look up the specifications of the it. You should then be able to find a suitable amp that will power the subwoofer for the TV from those specifications.

are you sure you have plugged in the speakers properly? maybe u inserted the cable in the wrong port or u just didnt insert the cable property. A loose connection can cause static and obviously it wont play anything. Please check.

I had a similar issue on mine. The easy fix was to insert a headset jack and pull it out quickly. I think something got stuck that turns off the speaker after I put the headset in the jack once. If this is the problem, I think you should also see a headset icon when making calls, even though no headset is attached.