I think those are the symptoms of a fairly common problem with that model, which requires replacing (or possibly reflowing the soldering) to a surface mounted IC which Philips term the 'painter IC' (IC7064), fitted on a plug in sub-board.
It is very important that exactly the correct version of the IC is used.
The components on that pcb are extremely small with the finest of soldered connections. I don't see Philips models very often but last time I had one with that fault (or similar), I sent the small signals panel to a Philips specialist with reflow equipment. I believe the final bill to the customer was around £130.
Cobweb
July 2006