Although I'm not currently a fan of Philips TVs (tracing their circuitry is a like trying to find a needle in a quagmire), the Philips 37PFL9603H10 can be more straight forward to fix and therefore cost-effective.

If your Philips 37PFL9603H10 has recently lost its Freeview channels, and/or you get a brief glimpse of channel name also showing before going blank (with the backlight still on) with no audio or display, then this should be repairable.

Although I've not come across one yet, I'd imagine this fault can also occur on the Philips 32PFL9603H10 and 42PFL9603H10 models