Converting thermoelectric fridge to DC- bypassing power supply

[Aaron The Tinkerer]

Hi guys, so I'm new here and not very knowledgeable in electronics, so I am hoping someone could help me with this. I have a thermoelectric fridge with one of those Chinese power supply/temp control boards and I'm trying to bypass the 120vac side to tap a 12vdc input lead directly into where 12vdc is created on the board, and before the temperature control section, in order to preserve the temperature control function (I don't want it running full power all the time).

I believe I've determined where negative is (partially marked in orange in 1st pic, which is right under the big transformer near the center of the board- too lazy to trace the whole path in Paint though, lol), but I haven't determined where positive is yet. Is this doable as a novice? Anyone have experience with this type of switch mode supply? I'm obviously trying to be very careful with my small multi-meter so that I don't accidentally zap myself with rectified line voltage.

[budm]

Re: Converting thermoelectric fridge to DC- bypassing power supply

You should stick to the original thread that you started.
For us to trace out the connections to see how many power supplies it has on this board beside the 12V, we need good clear focused pictures of both top and bottom of the board. We need to find out first how many transformer output winding it has beside the one for the 12V, then we may be able to do something about supplying the voltage to run the control circuits.

[Aaron The Tinkerer]

Re: Converting thermoelectric fridge to DC- bypassing power supply

Oh, that wasn't originally my thread. It wouldn't let me start a new thread when I first joined. But I do think I may have found what I was looking for.