Peltier 100% Test - Genuine vs Fake

[@electronistul]

If you have problems with your "chinese sellers" (aliexpress, alibaba, taobao, temu ... etc) always record your unboxing + test in one video as your primary video proof and then download this video and attach to your dispute as second proof.

[@soundfrequency-2520]

My cooler plates (TEC1-12706) are turn cold at initial and then hot only after a few seconds with only 12 V supply. I have to replace that cooler plate in cooler which has around 38V supply. So what is your suggestion?

[@electronistul]

0) Peltiers are a large family with various supply voltages, in your case the 12706 is supplied with a maximum of 14.4V (check the datasheet), so at 38V it will definitely be destroyed. 1) Do not power on for more than 2 seconds without a radiator (both parts + thermal paste) and without a controller => it will be destroyed, the temperature difference ("Delta T" 68C) between cold and hot is exceeded, which will lead to physical destruction , in a relatively short time of the semiconductors on the ceramic plates. 2) When this peltier is replaced, check that the controller is working correctly, clean the old paste and use the new paste, if not and it will run continuously => this peltier will be destroyed. The controller can be electronic or a thermal fuse calibrated to the specific temperature of the device (like coffee machines) My conclusion to what you asked: If you supplied it at 38V, it is definitely destroyed, it will behave like a resistance and will only generate heat, or if you supplied it correctly at 12V but did not put a radiator, or only on one side, and the temperature difference was exceeded ("Delta T " 68C) between cold and hot more than likely the peltier suffered damage or even failed, behaving now only as a resistor that gives heat. It's a bit strange for the "cooler" to have a 38V power supply and yet to power a 12706 peltier, physically check what voltage you get at the place on the motherboard where the wires from the peltier are connected, it must not be higher than the absolute max of 15.4V. If it is 38V, surely the motherboard / controller is also defective. But the other part, you removed the peltier from the cooler, nothing is written on it, and you thought of putting another found on the market? and 12706 did you think it was ok? If yes, this is not the procedure, read the datasheet on the cooler, you can't find the information about the peltier, look for an electronic diagram, a complete datasheet or ask authorized services to find out what model of peltier it is. Then you also have to check that the source / controller is within the parameters

[@CodEnrico]

Why it's a fake? It's a different type, it's also printed at the Peltier

[@electronistul]

Fake because: ESR is high compared to the datasheet, which results in a reduced power, then the size is small in the case of a 12715 of 4x4cm compared to 5x5cm, I noticed in time that it is not a must (different producer) but ESR / Power is mandatory.