I have a wine cooler that quit working..I have power on high voltage side after replacing the 2 transister and a capacitor both with the yellow arrows but still have no power on low side anywhere..I tested the transformers and both tested good and no shorts there but curious about why the voltage is only .5 on a 200 volt scale..nothing on low side has voltage…somewhat a newbi….tks in advance

 

Welcome to AAC!

The first thing we suggest you replace is this capacitor.

 

Ok..think I tested it but will pull out and test and replace

 

If you can, test for ESR. That's how they fail. The capacitance may not be out of spec but the resistance climbs.
But once you've taken the time to remove the cap, just replace it no matter the test. They age and have a limited lifetime. Putting a used cap back on the board makes no sense.

 

Ok..replaced the 2 on the right of heat sink..(one hidden under lip of heat sink) and the one on left(blue arrows).. still no change

 

To clarify the hot side of transformers has power but not on other side.. red side power..blue side not

 

Tell us the whole story from the beginning.
Why those two transistors and a capacitor were replaced?

 

They tested bad..the cap had a bulge too..the transistor on left goes to ground on left or bottom side

 

Can we get clearer, well focused photos of the board, both sides?

 

Best I can do with phone

 

The transistor on left had some pad damage so i added some extra solder

 

A somewhat newbie question.. does low side need a load on it to have voltage on output side of transformers

 

A closer pic of low volt side

 

Ok I did some further testing and even did a voltage injection on output side of both transformer’s using a 12 volt bat and I have voltage to all output ports.. the transformers all show low resistance between each leg.. im assuming that is maybe bad now.. shows zero ohms on all.. is it possible that both transformers went out at same time?.. what further test can I do on them to make sure.. the 120 v injection spots I used are the yellow arrows

 

so problem must be on the HV side... check diode and if you get DC across large caps. and before you power it up again, please cleanup the board. spray it with alcohol and use brush. HV section needs clearance between adjacent tracks and the crud may be causing shorts or leakage currents.

 

As you were advised, check the voltage on the two large black capacitors. If the mains voltage is 230V, there should be about 150V on them.


Thie SMPS must provide output voltage even if it is not loaded.

 

I have voltage to high side of transformers but low resistance in transformers

 

214 volts on all except yellow arrows which are on ground side

 

Check the voltage with a multimeter in DCV mode on one and the other capacitor.

Transformer resistance 0.1 or 1 ohm - is normal

 

I cleaned up but no change..diodes test ok but have to take out to get an accurate reading..where is smps?..the surface mounted power supply?