Problem: MY LEDS ARE VERY HOT TO TOUCH – ALMOST BURNING
This problem has two possible causes. Either (A) You you have a 24V power supply connected to 12V LED strips. Or (B) there is a ‘short’ along the strip – in other words the solder has gone across the PCB somewhere and the +ve and -ve are touching, shorting the circuit. Or if you have an output cable, the output +ve and -ve may be touching.
If option A is true, with 24 volts going to a 12V strip, then yes the strips will still work. They will in fact be brighter than they should be, as you have double the power going through. But the trouble is that this will damage the LEDs very quickly (usually within hours) and can be a fire hazard.
The same with option B: if +ve and -ve and are touching somewhere, then the strips will fail within hours and LEDs will be be damaged. You may even smell burning and this could be a fire hazard,
If you have a 24V power supply going to 12V strips, you can resolve this by getting a 12V power supply, or you can find a converter that converts 24V down to 12V (this would wire in between the power supply and the strip).
If you have a ‘short’, you will need to thoroughly check every single part of the strip close up and see if any solder is going across the connections. If so, then you can either resolder, or simply split the solder with a Stanley knife so that the +ve and -ve are no longer touching.