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The two FETs (circled) will be toast. Check the main regulator STR-W6053 for shorts as well as the bridge rectifier below the fuse for shorts.If the dead FETs are on the cold side of the power supply, I'd say they've merely failed. Replace them and in place of the fuse, substitute a 100W 240V lamp. This will protect the components against failure if other problems exist. If the lamp lights up brightly when mains is applied, you still have problems.BruceThanks Bruce;i'm trying to find STR-W6053N,regulator KN0N60,and Mosf KF5250, and i can't find them anywhere.
Don't know which country you're in, silva, but UT Source (China) stocks them, cheap as chips, lol. I've been very happy with their service. You don't have to buy in bulk, just ones or twos, but there is about 10 days delivery time. And they use Paypal. Bruce
Quote from: downunder on March 22, 2017,02:26:56 Don't know which country you're in, silva, but UT Source (China) stocks them, cheap as chips, lol. I've been very happy with their service. You don't have to buy in bulk, just ones or twos, but there is about 10 days delivery time. And they use Paypal. BruceThanks Bruce;i'm in USA. I checked The UT Source,I don't see this Mosf KF5250 the mosfet is like this don't know if this one is ok? and also Regulator KNON60https://www.utsource.net/ic-datasheet/20N03HL-1802035.htmlThis one is STRW6053N is good; https://www.utsource.net/ic-datasheet/STR_W6053N-1876553.htmlKNoN60 About this regulator not sure if this one is correct:https: //www.utsource.net/ic-datasheet/FGH60N60SFD-1892195.html
Check out KF5N50DS at UT. Should be the one.
Where did this KN0N60 number come from. It is not a typical FET number. Same with KF5250. Your original comment on KF5N50 is a more logical number where '5' represents a 5 amp current capability, and '50' represents a 500 volt limit.So any N-Channel FET using similar numbers with the same encapsulation should fit the bill. Bruce
Good choice = you need surface mount FETs.