Drywall describes the surface, not the whole wall
A large TV can be installed on a wall finished with drywall when the mount and attachment are suitable for the structure behind it. That is different from assuming the drywall sheet alone can support any television. Screen size, total load and bracket movement all need consideration.
Identify the intended support
The mount instructions may call for wood studs, a particular masonry surface or another approved construction. Confirm that the actual wall matches. If the desired screen center does not align with suitable support, a different wall-plate design, position or professionally designed backing arrangement may be needed.
Be cautious with anchor claims
An individual anchor's rating is not automatically a safe capacity for a TV assembly. Wall thickness, spacing, condition, load direction and the bracket's leverage can affect the installation. Do not add several package ratings together to invent a system rating.
Full motion needs special attention
Extending the TV moves its weight away from the wall and increases the turning effect at the fixing. Use a mounting system and attachment method approved for that condition. A fixed TV that stayed in place previously is not evidence that an articulating replacement will be suitable.
Information that helps an assessment
Provide the TV and bracket model numbers, the desired location and anything known about the framing. Mention cracks, moisture damage or earlier repairs around the attachment area. The right decision comes from checking the installation as a complete system, not from the word “drywall” or the TV diagonal alone.