Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
SOURCE: received new backlight inverters 6632L-0348b and
I wouldn't unless you're sure they match the particular model. Each of them are different depending on size of set. This can be verified by seial number version(ya1b, ya3b, c and so on). If you were to try this you might fry the backlight, requiring a replacement panel. They supply different voltages........Please be careful, can be lethal, 1000vdc or more........Good success, Meder's Tv
SOURCE: I have a Philips 42PFL7422D
There are only two boards. Master - 6632L-0470A REV 1.3 and Slave - 6632L-0471A Rev 1.3
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