120C is definitely warm but it is a power resistor so you would expect it to get warm.
The two transistors together on a block (of aluminium?) seem to have a large disc (capacitor?) bent over and touching one of them. Bend that gently away from the transistor (just far enough that they can't touch).

 

You mean this area https://postimg.org/image/nzv3qv68n/
with green box i marked

 

When the osciloscope start, works fine, but when is goes hot, only 2 timelines works, other need tap for see for 1 sec a image. I measured the resistor with infra again, and when this one goes to >120c , trouble start. Strange..
I bended for fix position of transistor of photo.

thx!

 

You mean this area https://postimg.org/image/nzv3qv68n/
with green box i marked

Yes, that's the place.

 

Perfect i do this, but trouble still

 

That is a power class resistor ...should be OK.
It even has insulators on the end wires.

 

Right, but the fault i think is when is going to hot , can be some short circuit, in a bad solder or bad component like a resistor or transistor..i think..

 

Looking at the schematic/photos there are quite a few electrolytic capacitors. These components can dry out or exhibit symptoms of aging.

 

Right, can be one of this, but i see metalhic capacitor, can change with new ones electrolyts?

 

All the large can shaped capacitors are the electrolytics ... metal, blue. Each electrolytic cap will have + or - polarity stamped on it some place. It is necessary to keep track of this polarity orientation... The best fix is to remove each one and test it using a capacitor tester. Alternatively, just replace each one with the specific equivalent ... uF and also voltage. If you de-solder any of the capacitors, use solder wick, apply sufficient heat to each lead, and try not to damage the circuit trace rings on the board ... This may take a little practice. Don't forget to first mark the polarity orientation on the board.

 

Right, this one blue https://postimg.org/image/4ic9od4hp/ look in one side a bit opened, i take a photo when i back to home. This one is methalic blue, can change with new ones electrolyte of this time, no metalic.

 

Bulging top, discoloration ... any sort of visual irregularity