Electronics > Beginners
Cannot Decide on a Resistor Value
xavier60:
Power Integrations SMPS ICs commonly fail. Check the TNY*** IC for Drain to Source short or low resistance.
JS:
Before removing it from the PCB be sure to measure with the correct polarity, if measured backwards you won't blow a 400V cap with your DMM but you could be measuring the bridge diode. It isn't likely to be shorted without blowing off the pressure relief marks but it could happen. Also, there are no other signs of damage, for now you should take the resistors off, you know they are bad and the less stuff in the PCB the better to measure around, without the resistors and the jumper on L1 position which you could easily take out without much risk you can check the bridge almost unconnected.
JS
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