SMPS Repair


New member
I need some help to diagnose this SMPS. I have repaired a few in the past by getting lucky. This one is important to me and I would like to learn a strategy with this. It has no standby power now and is dead. Can one tell by the topology how this works? it is power board L2231-2m


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Staff member
It looks to me its based on some FSFR chip.

However, you have to fix the standby power supply, then you have to check the main power supply.

If you post a better quality picture from top?


Hi I can see it is an smps with power factor correction at the input. As MicorsiM said a picture which can show the oscillator and also the pfc chip will greatly help. If you can state where this smps is used maybe you can search for a schematic. The schematic will greatly help out. It could also be the case that a protection circuit is activated and could be the reason why the smps seems dead.