Ok. so this is my first Thread and I'm kinda new to actually trouble shooting circuits like this but i have read a lot of other post here and got the general basics down I think and so far i haven't seen a problems like mine.
so to start with whats obviously wrong with the board and that would be Resistor r605 I noticed it had been hot and i could read the markings so I opened the working monitor I have (matching set) and it should have been a 10k ohm resistor. checking it with a dmm I was reading about 25K ohms so i replaced it and its smoked up in just a few seconds.
What do you think could be causing this? I think its part of what you all call the start up circuit? correct me if im wrong.
what I have checked
voltage on main cap= 162v dc
Bridge rectifier = ok
checked esr of caps and all very close to specs i could find on there datasheets ( i know you this doesn't mean there all good because some are in parallel and the bad one wont show but im not worried about those at the moment)
Im a little rusty on checking mosfets so im not 100% sure on it but the values are not matching that of the working board also checking the ic for a short i am getting resistance between almost all the pins and thats not the case with the working board.
so to start with whats obviously wrong with the board and that would be Resistor r605 I noticed it had been hot and i could read the markings so I opened the working monitor I have (matching set) and it should have been a 10k ohm resistor. checking it with a dmm I was reading about 25K ohms so i replaced it and its smoked up in just a few seconds.
What do you think could be causing this? I think its part of what you all call the start up circuit? correct me if im wrong.
what I have checked
voltage on main cap= 162v dc
Bridge rectifier = ok
checked esr of caps and all very close to specs i could find on there datasheets ( i know you this doesn't mean there all good because some are in parallel and the bad one wont show but im not worried about those at the moment)
Im a little rusty on checking mosfets so im not 100% sure on it but the values are not matching that of the working board also checking the ic for a short i am getting resistance between almost all the pins and thats not the case with the working board.
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