la7845 sub?

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hi
i want to replace la7845 with la7840
la7845-2.2aamp
la7840-1.8amp

the date sheet for the la7845 said it can be used in tv with screen size about 37 inch.and the la7840 said it can be used with small and midium screens
i am wondering if la7840 will work in a tv with a 25 inch screen

any ideas??
 
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