Post photos if no one can answer your questions. I have no clue what this amp is.
Here are the picture of driver board and main board. Thank you.
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If you solder a bridge between pins 2 and 3 of the 21844, does the amp power up with no DC on the output filter inductor?
yes there is no DC on filter inductor when pin 2 and 3 are bridged, probes placed on secondary ground and inductor.
If you drive a strong signal into the amp, do you see drive pulses on pin 1 of the driver IC?
without removing the bridge between pin 2 and pin 3 i drove 100hz signal and i got oscillations on pin 1 and i am attaching the same here for your reference. Thank you.
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Is that waveform driving precisely back down to the negative rail?
Was the problem precisely the same before replacing the ICs on that board as it is now (without the 2-3 jumper)?
The problem was no output. i was not getting no oscillations on any gates of outputs.
i thought driver board problem so i changed both IC. Now also i am not getting no oscillations.
Yes the drive is going in negative. i am using current limit. if i try without current limit it is pulling 3ams and power supply mosfets gettings hot.
with current limiting resistor it is only pulling 1A.
Solder a 10k resistor between legs 1 and 2 of the TL072. Drive a signal into the amp. Does the TL072 produce clean audio with essentially no DC voltage on pin 1?
Yes it have beautiful sine wave on pin 1 and no DC.
Solder a 10k resistor between legs 1 and 2 of the TL072. Drive a signal into the amp. Does the TL072 produce clean audio with essentially no DC voltage on pin 1?
On both sides i have IRFP250 outputs is that correct?
Is the output of the LM211 a square wave swinging ±5v?
Yes LM211 output has +-5V swinging good.
With the black probe on the negative rail, do you have 12v on pin 7 of the IR21844?
I have 10.2V. I am using current limit resistor.
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