Good night: I am trying to repair a Simple Switching Source (switching) of a Wine Cooler. The Source has Main Vo Output = 12 Vdc that feeds a Peltier Cell which cools on one side and heats on the other, plus some Coolers and ends the whole mystery. * The Failure: Mark "Protection" and does not give 12 Volts, but something like 10.15 to 11 volts "No Load" (bone all disconnected) Tests and tests I performed: - I focus more than anything on the "Hot Parts" bone Semi-Conductors and they are all well. - I checked the fuse, thermistor, etc. of the input are all in continuity. -The bridge rectif. input, good - Mosfets input oscillators, fine - The Shotcky Diode of Salidad, well - The output capacitor, well -The input capacitors, fine - An 8Volts Output regulator (which feeds the front panel), Well - TL494, well, (I replaced it) - carries an IC. (8-leg amp-op) like 4558 which I suppose takes the thermostat signal to turn off the source when the desired point is reached. Well, replace it with another - Most Zener diodes, and common, Good * That is why I find it extremely rare that I walk everything and at the same time mark "protection" Good in reality they turn on (without load) the Red Led + Green Led

I suggest you take out the electrical scheme of the cold section and analyze who and how the LEDs are commanded and surely the analysis of it will guide you to the possible resolution of it, if you do not upload it here to analyze it and be able to help you. Changing things because they are there usually only worsens the situation due to collateral damage in the process. Greetings. Ric-