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will the current bracket support the additional weight?
Impossible to tell, depends what the bracket is and how well it is fixed to the wall.
standard bolt patterns
Yes, but with more than one standard to choose from. A smaller TV might use VESA 100x100 while a larger could use VESA 200x200. Many brackets have more than one set of holes but some displays have a recessed area the bracket has to fit which means you have to use a bracket that isn't too big that then wouldn't have the bigger holes you might need.
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Is it a cantilever one or just flush to the wall?
I'd be a bit wary of just swapping a cantilever one if the new TV was much heavier and it was possibly going to be used at full extension.
Did you put the first one up and, if so, do you tend to massively overspec the fixings, just in case?
Have a google of the old and new TV model and see what VESA fixings they use. You may need some extension plates like these
TV bracelet query. Daughter wants a bigger tv in her room. I have acquired a 48 inch tv to replace the smaller one which she has. Question - will the current bracket support the additional weight? Have brackets standard bolt patterns and can I just remove one and put the other one up with the same bolts.
Asking before I start. I understand that I can work out the answers if I take the current tv down but it’s a difficult task and I want it done in one go.
Thanks all.