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I have picture and sound but picture then goes off but sound remains

I have picture and sound but picture then goes off but sound remains

I have a panasonic tx-48cx400b with same/ similar issue. When tv 1st switched on i have picture and sound but picture then goes off but sound remains on. If i look at screen while on top of table (removed from wall) i can see faint control pictures ie if i press volume or menu. I removed the back of tv an can see white lights but then they go off. I presume these lights are the backlight. What actually controls the backlight? Does the main power board have a cut out/relay to supply the backlight and could this be the issue. While i had the back off the tv i looked for any obvious signs of faults ie loose cable burnt pcb or anything that didnt look right but nothing stood out. Any advice wiuld be appreciated

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