Post a good quality photo of the component side of the entire main board and the component side of any driver boards if no one can help.
I am reviewing resistances and oscillation source mosfets and also resistances and mosfets of the amplification stage
When checking transistors (bipolar or FET) with your meter set to ohms, you should not read anything near 0 ohms when the probes are touched to the terminals of any individual transistor in any configuration. If any are shorted (~0 ohms between any 2 legs of any individual transistor), they will likely be shorted from leg 2 to leg 3 but you should check 1-2, 1-3 and 2-3.
Check all of the transistors individually. If it appears that several are shorted, you'll need to remove all that appear shorted from the board and check them individually. In the case of the output transistors, if you find only 1 shorted in a group of parallel-connected transistors, you can reinstall the ones that are not shorted to see if the amp will power up. If it does, you need to replace all in that group of parallel transistors. This is generally only viable for audio output transistors. Generally, when one power supply FET shorts, all will fail and all will have to be replaced.
Check all of the transistors individually. If it appears that several are shorted, you'll need to remove all that appear shorted from the board and check them individually. In the case of the output transistors, if you find only 1 shorted in a group of parallel-connected transistors, you can reinstall the ones that are not shorted to see if the amp will power up. If it does, you need to replace all in that group of parallel transistors. This is generally only viable for audio output transistors. Generally, when one power supply FET shorts, all will fail and all will have to be replaced.
and what will be the resistance values of the gate of mosfets irf3205 source and amplification irf9640 and irf640
The resistance between the gate and the other 2 terminals should be infinity. This is for all of the heatsink mounted FETs. This only applies to the FETs out of the board.
The gate resistors don't appear to be burned. Which ones are you referring to?
Did any FETs check as shorted?
Did any FETs check as shorted?