Hello there,
got a SMPS from an old Nintendo 64 game system here. It should deliver 3.3V and 12V out of 230V AC (EU model). Well it did, until lately where it would not deliver any voltage after plugging it in. It failed silently it seems.
It has no noises, and after some recommendations I checked already on the primary side:
- Primary side DC converter + cap OK (316V stable)
- No burn marks, all caps look ok
- 1 MOSFET, 1 Transistor not short
- Various resistors look good.
- Coil has 5 connectors, 1 is unused, 2 carry V+, 1 goes to V-, the other one probably into the controller logic.
The secondary side is completely dead it seems.
My biggest problem is to determine the type of the converter. The board layout is a bit clumsy and its hard to track all connections. The controller logic has 2 optos and 3 wires to the primary side. I imagine its a startup problem, but how can I check this? I also have no access to an oscilloscope or such.
Any help appreciated, thanks
Florian
got a SMPS from an old Nintendo 64 game system here. It should deliver 3.3V and 12V out of 230V AC (EU model). Well it did, until lately where it would not deliver any voltage after plugging it in. It failed silently it seems.
It has no noises, and after some recommendations I checked already on the primary side:
- Primary side DC converter + cap OK (316V stable)
- No burn marks, all caps look ok
- 1 MOSFET, 1 Transistor not short
- Various resistors look good.
- Coil has 5 connectors, 1 is unused, 2 carry V+, 1 goes to V-, the other one probably into the controller logic.
The secondary side is completely dead it seems.
My biggest problem is to determine the type of the converter. The board layout is a bit clumsy and its hard to track all connections. The controller logic has 2 optos and 3 wires to the primary side. I imagine its a startup problem, but how can I check this? I also have no access to an oscilloscope or such.
Any help appreciated, thanks
Florian