Problem with my Power Bright inverter PW6000-12 - Output voltage higher than 110V

[MMR]

About one month ago, I've bought a PW6000-12 Power inverter from Amazon. Unfortunately, my brother has damaged it when he was trying to interconnect this inverter through the commercial power AC utility. It really blew up a lot of components in the circuit!
I had to change half of the power MOSFETs (IRFP260N), the driver transistors (AN1013 and SC2383), some optocouplers (PC817) and one resistor connected to MOSFET (220R). After that, it came alive again. The display was showing the correct battery voltage, the output frequency was 60Hz. But, the drawback was that the output AC power was too high, around 160V instead of 110V! Since I don't have the electrical diagram of this circuit, I have to use my knowledge and a bit of "intuition" in order to troubleshoot this issue. I could observe that the voltage in the connector CON8-1 was around 182V. Then I suspected some problem related to the Voltage gain control (feedback). I have tested some components but I couldn't find any remaining faulty component...
I would like to get some help from you in order to identify why the AC output voltage is so high now. I believe the solution is very close now. Thanks!

 

[jaggerwild]

And you posted it here WHY?
Cause yer a boot and you were bored to death.

 

[MMR]

And you posted it here WHY?
Cause yer a boot and you were bored to death.

Hello mister!

Sorry if it's not the right place. I just saw another similar post here...That's why I did the same.

 

[truth teller]

most likely the feedback loop inside one of the transformers has burned/shorted, leading to lower voltage detection in it which in turn will lead the remaining circuitry to increase the output voltage to compensate
check the ohms on each of the transformers loops, you might need a high voltage meter for this (maybe rent one, or just buy a new set of transformers)
gl

 

[SnakeDoctor]

And you posted it here WHY?
Cause yer a boot and you were bored to death.

Really Dude ??? Alt f4 if not willing to add anything to the topic, which is perfectly relevant .No need to act like a tool

Quite interested in the topic , hope you manage to get it working .

 

[MMR]

most likely the feedback loop inside one of the transformers has burned/shorted, leading to lower voltage detection in it which in turn will lead the remaining circuitry to increase the output voltage to compensate
check the ohms on each of the transformers loops, you might need a high voltage meter for this (maybe rent one, or just buy a new set of transformers)
gl

Hello buddy!

Very good tip! Well, I didn't check yet the feedback transformer, only the optocoupler. Once I get home, I will try that and let you know the results. Thanks!