I left the amp on for about 4 hours and the amp has not protected i detected it goes to protection when the chip is Hot and i touch the board, with no touching the board tje amp stay green ligth an rail voltages in -85 and +85
When you pull the chip out of the board, should i use heat gun or normal Cautín? , and When you install the New one, what method you use? When i read your lasts answer i asume you use normal Cautín, but i,m not shure about it.
i m back again with this amp, now that i got the owon scope, can you comment what do you think i posted a pic from the signal of the psu i do not see a problem with it.
ihave +85 and minus 85 volts in rails i
In the output section i got
in the negative rail gate=-85.3 volts drain 0,03 volt and source -85.7
positive rail gate=-0.4 volts Drain =85.8 volts source 0.034 volts
the values are with no mosfets installed
i injected a sine wave 40 hz in the audio input in attemp to start oscillation, with no succes
i tried to measure switching signal , there is no signal in the gates i measure other pins and got only the dc voktage of the rails in the pins a said before
i think the next step is replace the switching Ic.
something weird is happening, i inject the 40 hz signal and i am able to trace it a the pin 5 of the 4558d with the amp off, but as soon as i turn on the amp i lost that signal, instead i got oscilation between 300 to 1 khz, tihs strange signal is present at the input rcas, it seems that this signal overlap the 40 hz signal, when i turn off the amp the 40 hz is there, the same with the channel Rigth i trace the signal and is present in pin 3 of the same op amp, but i lost it with the amp is on.
Between 12v.negative. And secondary ground (I understand secondary ground as the point where te negative. Of the positive rail joins with the positive of the negative rail). I tried to explain in case I made a mistake. The r=. 1 kohm