Re: Magnavox DRV power supply SMPS
OK, try this...
Using a PC PSU, insert 5V at the EV+5V pins on the output of the Magnavox DRV power supply and 12V on the EV+12V. Do NOT plug the Magnavox PSU in the wall. With your multimeter, measure the voltage across either capacitors C2204 and C2205 or directly at pins EV+5V and EV+12V with the PC PSU powered On. Post what voltage you get here. Next, with the PC PSU still powered, measure voltage on pin 1 of IC2201 (KIA431 shunt regulator). It should be 2.5V or close, but again, please post exactly what voltage you get with your multimeter. Then also measure the voltage on pin 3 of the same IC (IC2201) and post the results.
Once I know what values you get for these, I will modify this test a little bit so that we can determine if IC2201 is providing feedback to the primary side, as it should. If not, that could be the reason why your PSU is "stuck" On.
OK, try this...
Using a PC PSU, insert 5V at the EV+5V pins on the output of the Magnavox DRV power supply and 12V on the EV+12V. Do NOT plug the Magnavox PSU in the wall. With your multimeter, measure the voltage across either capacitors C2204 and C2205 or directly at pins EV+5V and EV+12V with the PC PSU powered On. Post what voltage you get here. Next, with the PC PSU still powered, measure voltage on pin 1 of IC2201 (KIA431 shunt regulator). It should be 2.5V or close, but again, please post exactly what voltage you get with your multimeter. Then also measure the voltage on pin 3 of the same IC (IC2201) and post the results.
Once I know what values you get for these, I will modify this test a little bit so that we can determine if IC2201 is providing feedback to the primary side, as it should. If not, that could be the reason why your PSU is "stuck" On.
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