Looking at the model ## I assume this is not a US sold set. In the
US it is probably a 35## model, actual screen size ( 35").
Anyways most problems like this are bad electrolytic caps. Usually
small surface mounts in the PIP or video in general. This type of problem
can make a tech run like hell !
When new you could buy main boards & sub assemblies until they were gone.
After that if in warranty the set was junked & replaced.
So sorry I cant give a simple solution but maybe others can help.
good luck
73 Zeno
LFOD !