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sounds like Convergence issue.... I have some pictures of the bowing picture TV on the link below...
I'll post you my general message which is for a similar Philips Magnavox 51 inch TV, you'll need to check the manual verify the correct IC convergence chips and resistors, the manual link is below as well... usally the IC's are STK392-120's or 150's and the resistors are 6.8 ohm 12 of then...
anyway read the general post below it will get you headed in the right direction.
51MP392H/17 Actually I have this TV and you need 2 Convergence IC's STK392-120's (120's and 150's will work) of course order 2 of the same type I'm using replacement 150's they allow for a little higher heat and were cheaper ALSO you need to replace the 12 resistors with 6.8 ohm metal film resistors, make sure they are metal film! don’t skimp out here I did and then they blew and fried my IC's and I had to replace everything again!
What you need: (2) STK392-120 OR STK392-150 IC chips (12) 6.8 Ohm Metal Film resistors set of star screw drivers 15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item. good leaded solder, and flux
I'm going to guess here that one of the "excuses" has been the delay in getting replacement parts, yes? This is a common problem with service centers that unfortunately is outside of their control. If you can provide more detail about what is happening, perhaps I can clarify the process and teh service center's frustration as well as your own.