I can unplugged from main my TV and waiting some time and then try to measure something,could be the problem some component belong to this circuit like resistors,capacitors?or is the transformer it self?
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You probably have a main or high voltage power supply problem; the latter produces the 20,000 plus volts for the CRT and gets its voltage from the main supply.
It's difficult to say which is at fault without a few measurements.
This will almost certainly be a problem with the Line output transformer, sometimes known as the flyback transformer. It will need to be repaired by a qualified technician I'm affraid as there are dangerous voltages on this part even with the set unplugged from the mains.
hello .this does sound like bad solder joints .all printed circuit boards do this after a while due to heating and cooling .is not advisable to try to repair yourself .possible electric shock and spiking .will do a lot of damage .take to a shop to have repaired
Try this: unplug the set and wait about 10 or 20 minutes. This is to make sure that the main power supply filter caps completely discharge. Look on the power supply board, close to where the AC cord attaches to the board. Look for a white resistor labeled "0.1 OHM" (the symbol for OHM, like an upside-down U) and measure it with your ohm meter. If it is open then your switching transistors in the main power supply are most certainly shorted. Older sets had 2 separate transistors on little heat sinks labeled "C4834", then they switched to 2 transistors in one package labeled "MX0841" or "MX0842", and then some sets went to two separate MOSFET transistors. Measure those parts and post your results and we will guide you from there.