sony wega kv-28hx15u

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can anyone help,have the above tv which keeps going into standby,
this is the second set i have had with this fault the first went into the
workshop and was returned to me with the line output trans blown up as well. The catalogue i bought it from were very reluctant to replace it
and i ended up without a tv for a month. A service engineer is calling today but dont want to go through the same hassel as last time.
any advice anyone?