Help identifying cyan three lead component marked 270S
Its almost certainly a Ceramic Resonator.
These are three terminal devices that have a similar function to a crystal when used in an oscillator circuit, but are much cheaper and consequently have poor tolerances. Unlike most crystals, the ceramic oscillator contains built-in capacitors, so the extra pin (usually the middle one) is ground.
The marking 270 will almost certainly indicate 27MHz. This is a very common frequency in TVs - being the reference frequency for both PAL and NTSC video standards.
The S could be tolerance information, or it could be a date code. As an EIAJ monthly code, S would be May 2010 or some multiple of 8 years either side of it (e.g. 2002 or 2018)
There is no manufacturer information, so it won't be possible to find the exact specifications, however something like Murata CSTLS27M0X51 would be a similar type of device.